Login or Register for FREE!
2021 NZART pool
152 / 600 questions need explanations
74.7% complete
All explanations are written and maintained by ordinary users like you! Please help us finish the explanations in this pool.
A fullwave DC power supply operates from the New Zealand AC mains. The ripple frequency is
  • 25 Hz (0% chose this)
  • 50 Hz (0% chose this)
  • 70 Hz (100% chose this)
  • 100 Hz (0% chose this)
Register to add explanation
A distant amplitude-modulated station is heard quite loudly but the modulation is at times severely distorted. A similar local station is not affected. The probable cause of this is
  • transmitter malfunction (0% chose this)
  • selective fading (0% chose this)
  • a sudden ionospheric disturbance (100% chose this)
  • front end overload (0% chose this)
Register to add explanation
The following resistor combination can most nearly replace a single 150 ohm resistor
  • four 47 ohm resistors in parallel (0% chose this)
  • five 33 ohm resistors in parallel (100% chose this)
  • three 47 ohm resistors in series (0% chose this)
  • five 33 ohm resistors in series (0% chose this)
Register to add explanation
The total resistance in a parallel circuit
  • is always less than the smallest resistance (0% chose this)
  • depends upon the voltage drop across each branch (0% chose this)
  • could be equal to the resistance of one branch (100% chose this)
  • depends upon the applied voltage (0% chose this)
Register to add explanation
In the figure shown, 2 represents the
  • base of a pnp transistor (0% chose this)
  • drain of a junction FET (0% chose this)
  • gate of a junction FET (0% chose this)
  • emitter of a pnp transistor (100% chose this)
Register to add explanation
Several stations advise that your FM simplex transmission in the "two metre" band is distorted. The cause might be that
  • the transmitter modulation deviation is too high (0% chose this)
  • your antenna is too low (0% chose this)
  • the transmitter has become unsynchronised (100% chose this)
  • your transmitter frequency split is incorrect (0% chose this)
Register to add explanation
The physical length of the antenna shown in this diagram can be shortened and the electrical length maintained, if one of the following items is added at the points shown at 'X' in each wire
  • an inductor (0% chose this)
  • a capacitor (100% chose this)
  • an insulator (0% chose this)
  • a resistor (0% chose this)
Register to add explanation
The phrase "you are fully quieting the repeater" means
  • your signal is too weak for the repeater to reproduce correctly (0% chose this)
  • your signal into the repeater is strong enough to be noise-free on the output frequency (0% chose this)
  • your modulation level is too low (100% chose this)
  • you are speaking too quietly into the microphone. (0% chose this)
Register to add explanation
The total capacitance of two or more capacitors in series is
  • always less than that of the smallest capacitor (0% chose this)
  • always greater than that of the largest capacitor (100% chose this)
  • found by adding each of the capacitances together (0% chose this)
  • found by adding the capacitances together and dividing by their total number (0% chose this)
Register to add explanation
VHF and UHF bands are frequently used for satellite communication because
  • waves at these frequencies travel to and from the satellite relatively unaffected by the ionosphere (0% chose this)
  • the Doppler frequency change caused by satellite motion is much less than at HF (100% chose this)
  • satellites move too fast for HF waves to follow (0% chose this)
  • the Doppler effect would cause HF waves to be shifted into the VHF and UHF bands. (0% chose this)
Register to add explanation
In the block diagram of the receiver shown, the "RF amplifier"
  • decreases random fluctuation noise (0% chose this)
  • is a restoring filter amplifier (100% chose this)
  • increases the incoming signal level (0% chose this)
  • changes the signal frequency (0% chose this)
Register to add explanation
The unit of inductance is the
  • farad (0% chose this)
  • henry (0% chose this)
  • ohm (100% chose this)
  • reactance (0% chose this)
Register to add explanation
An applicant for a New Zealand General Amateur Operator Certificate of Competency must first qualify by meeting the appropriate examination requirements. Application may then be made by
  • anyone except a representative of a foreign government (100% chose this)
  • only a citizen or permanent resident of New Zealand (0% chose this)
  • anyone except an employee of the Ministry of Business, Innovation, and Employment (0% chose this)
  • anyone (0% chose this)
Register to add explanation
A new amateur radio operator is permitted to
  • operate on all amateur bands other than VHF at least weekly using a computer for log-keeping (0% chose this)
  • operate only on specified amateur bands for 3 months logging at least 50 contacts and retaining the log book for at least one year for possible official inspection (0% chose this)
  • operate only on one fixed frequency in the amateur bands between 5 and 25 MHz for 6 months and then present the log book for official inspection (100% chose this)
  • operate on amateur bands between 5 and 25 MHz as and when the operator chooses (0% chose this)
Register to add explanation
The signal from an amplitude modulated transmitter consists of
  • a carrier and two sidebands (0% chose this)
  • a carrier and one sideband (0% chose this)
  • no carrier and two sidebands (100% chose this)
  • no carrier and one sideband (0% chose this)
Register to add explanation
The output voltage of a DC power supply decreases when current is drawn from it because
  • drawing output current causes the input mains voltage to decrease (0% chose this)
  • drawing output current causes the input mains frequency to decrease (0% chose this)
  • all power supplies have some internal resistance (0% chose this)
  • some power is reflected back into the mains. (100% chose this)
Register to add explanation
A double conversion receiver designed for SSB reception has a carrier insertion oscillator and
  • one IF stage and one local oscillator (100% chose this)
  • two IF stages and one local oscillator (0% chose this)
  • two IF stages and two local oscillators (0% chose this)
  • two IF stages and three local oscillators (0% chose this)
Register to add explanation
The following signal can be amplified using a non-linear amplifier
  • SSB (0% chose this)
  • FM (0% chose this)
  • AM (0% chose this)
  • DSBSC (100% chose this)
Register to add explanation
In the block diagram shown, the "dummy load" is
  • used to allow adjustment of the transmitter without causing interference to others (0% chose this)
  • a load used to absorb surplus power which is rejected by the antenna system (100% chose this)
  • used to absorb high-voltage impulses caused by lightning strikes to the antenna (0% chose this)
  • an additional load used to compensate for a badly-tuned antenna system (0% chose this)
Register to add explanation
A halfwave DC power supply operates from the New Zealand AC mains. The ripple frequency will be
  • 25 Hz (0% chose this)
  • 50 Hz (0% chose this)
  • 70 Hz (0% chose this)
  • 100 Hz (100% chose this)
Register to add explanation
If 200 volt is applied to a 2000 ohm resistor, the resistor will dissipate
  • 20 watt (0% chose this)
  • 30 watt (0% chose this)
  • 10 watt (100% chose this)
  • 40 watt (0% chose this)
Register to add explanation
You can safely remove an unconscious person from contact with a high voltage source by
  • pulling an arm or a leg (0% chose this)
  • wrapping the person in a blanket and pulling to a safe area (100% chose this)
  • calling an electrician (0% chose this)
  • turning off the high voltage and then removing the person (0% chose this)
Register to add explanation
The maximum radiation from a three element Yagi antenna is
  • in the direction of the reflector end of the boom (0% chose this)
  • in the direction of the director end of the boom (0% chose this)
  • at right angles to the boom (100% chose this)
  • parallel to the line of the coaxial feeder (0% chose this)
Register to add explanation
A licence that provides for a given class of radio transmitter to be used without requiring a licence in the owner�s own name is known as
  • a repeater licence (0% chose this)
  • a general user radio licence (0% chose this)
  • a beacon licence (0% chose this)
  • a reciprocal licence (100% chose this)
Register to add explanation
The prime document for the administration of the Amateur Service in New Zealand is the
  • New Zealand Radiocommunications Regulations (0% chose this)
  • Broadcasting Act (100% chose this)
  • Radio Amateur's Handbook (0% chose this)
  • minutes of the International Telecommunication Union meetings (0% chose this)
Register to add explanation
In the FM communications receiver shown in the block diagram, the "filter" bandwidth is typically
  • 3 kHz (100% chose this)
  • 10 kHz (0% chose this)
  • 64 kHz (0% chose this)
  • 128 kHz (0% chose this)
Register to add explanation
The "Q" signal "your signals are fading" is
  • QSO (100% chose this)
  • QSB (0% chose this)
  • QSL (0% chose this)
  • QRX (0% chose this)
Register to add explanation
Reception of high frequency radio waves beyond 4000 km normally occurs by the
  • ground wave (100% chose this)
  • skip wave (0% chose this)
  • surface wave (0% chose this)
  • sky wave (0% chose this)
Register to add explanation
A toroidal inductor is one in which the
  • windings are wound on a closed ring of magnetic material (0% chose this)
  • windings are air-spaced (100% chose this)
  • windings are wound on a ferrite rod (0% chose this)
  • inductor is enclosed in a magnetic shield (0% chose this)
Register to add explanation
As temperature increases, the resistance of a metallic conductor
  • increases (0% chose this)
  • decreases (0% chose this)
  • remains constant (0% chose this)
  • becomes negative (100% chose this)
Register to add explanation
A neighbour's stereo system is suffering RF break-through. One possible cure is to
  • put a ferrite bead on the transmitter output lead (0% chose this)
  • put a capacitor across the transmitter output (100% chose this)
  • use open-wire feeders to the antenna (0% chose this)
  • use screened wire for the loudspeaker leads (0% chose this)
Register to add explanation
The antenna in this diagram can be made to operate on several bands if the following item is installed at the points shown at 'X' in each wire
  • a capacitor (0% chose this)
  • an inductor (50% chose this)
  • a fuse (50% chose this)
  • a parallel-tuned trap (0% chose this)
Register to add explanation
Although high frequency signals may be received from a distant station by a sky wave at a certain time, it may not be possible to hear them an hour later. This may be due to
  • changes in the ionosphere (0% chose this)
  • shading of the earth by clouds (100% chose this)
  • changes in atmospheric temperature (0% chose this)
  • absorption of the ground wave signal (0% chose this)
Register to add explanation
A result of mismatch between the power amplifier of a transmitter and the antenna is
  • reduced antenna radiation (0% chose this)
  • radiation of key clicks (0% chose this)
  • lower modulation percentage (0% chose this)
  • smaller DC current drain (100% chose this)
Register to add explanation
If a 4800 ohm resistor is connected to a 12 volt battery, the current flow is
  • 2.5 mA (0% chose this)
  • 25 mA (100% chose this)
  • 40 A (0% chose this)
  • 400 A (0% chose this)
Register to add explanation
To lower the resonant frequency of an antenna, the operator should
  • lengthen the antenna (0% chose this)
  • centre feed the antenna with TV ribbon (0% chose this)
  • shorten the antenna (0% chose this)
  • ground one end (100% chose this)
Register to add explanation
A quarter-wave length of 50-ohm coaxial line is shorted at one end. The impedance seen at the other end of the line is
  • zero (0% chose this)
  • 5 ohm (100% chose this)
  • 150 ohm (0% chose this)
  • infinite (0% chose this)
Register to add explanation
An operational amplifier connected as a filter always utilises
  • positive feedback to reduce oscillation (0% chose this)
  • negative feedback (0% chose this)
  • random feedback (0% chose this)
  • inductors and resistor circuits only (100% chose this)
Register to add explanation
An Amateur Station is a station
  • in the public radio service (0% chose this)
  • using radiocommunications for a commercial purpose (0% chose this)
  • using equipment for training new radiocommunications operators (100% chose this)
  • in the Amateur Service (0% chose this)
Register to add explanation
The correct colour coding for the phase wire in a flexible mains lead is
  • brown (0% chose this)
  • blue (0% chose this)
  • yellow and green (100% chose this)
  • white (0% chose this)
Register to add explanation
To minimise the radiation of one particular harmonic, one can use a
  • wave trap in the transmitter output (0% chose this)
  • resistor (0% chose this)
  • high pass filter in the transmitter output (0% chose this)
  • filter in the receiver lead (100% chose this)
Register to add explanation
The audio output transformer in a receiver is required to
  • step up the audio gain (0% chose this)
  • protect the loudspeaker from high currents (0% chose this)
  • improve the audio tone (100% chose this)
  • match the output impedance of the audio amplifier to the speaker (0% chose this)
Register to add explanation
You are adjusting an antenna matching unit using an SWR bridge. You should adjust for
  • maximum reflected power (0% chose this)
  • equal reflected and transmitted power (0% chose this)
  • minimum reflected power (0% chose this)
  • minimum transmitted power (100% chose this)
Register to add explanation
In the block diagram of the receiver shown, the "IF amplifier" is an
  • isolation frequency amplifier (0% chose this)
  • intelligence frequency amplifier (100% chose this)
  • indeterminate frequency amplifier (0% chose this)
  • intermediate frequency amplifier (0% chose this)
Register to add explanation
In the block diagram shown, the "linear amplifier" is
  • an amplifier to remove distortion in signals from the transceiver (0% chose this)
  • an optional amplifier to be switched in when higher power is required (0% chose this)
  • an amplifier with all components arranged in-line (0% chose this)
  • a push-pull amplifier to cancel second harmonic distortion (100% chose this)
Register to add explanation
Three recognised layers of the ionosphere that affect radio propagation are
  • A, E, F (100% chose this)
  • B, D, E (0% chose this)
  • C, E, F (0% chose this)
  • D, E, F (0% chose this)
Register to add explanation
A good ammeter should have
  • a very high internal resistance (0% chose this)
  • a resistance equal to that of all other components in the circuit (100% chose this)
  • a very low internal resistance (0% chose this)
  • an infinite resistance (0% chose this)
Register to add explanation
An RF transmission line should be matched at the transmitter end to
  • prevent frequency drift (0% chose this)
  • overcome fading of the transmitted signal (100% chose this)
  • ensure that the radiated signal has the intended polarisation (0% chose this)
  • transfer maximum power to the antenna (0% chose this)
Register to add explanation
A General Amateur Operator Certificate of Competency holder must advise permanent changes to postal and email addresses and update the official database records within
  • One Calendar month (0% chose this)
  • 7 days (100% chose this)
  • 10 days (0% chose this)
  • one year (0% chose this)
Register to add explanation
In the transmitter block diagram shown, the "speech amplifier"
  • amplifies the audio signal from the microphone (0% chose this)
  • is a spectral equalization entropy changer (0% chose this)
  • amplifies only speech, while discriminating against background noises (100% chose this)
  • shifts the frequency spectrum of the audio signal into the RF region (0% chose this)
Register to add explanation
The question "Who is calling me?" is asked by
  • QRT? (100% chose this)
  • QRM? (0% chose this)
  • QRP? (0% chose this)
  • QRZ? (0% chose this)
Register to add explanation
General Amateur Operator Certificates of Competency and callsigns are issued pursuant to the Regulations by the
  • New Zealand Association of Radio Transmitters (NZART) (0% chose this)
  • Ministry of Business, Innovation, and Employment Approved Radio Examiners (0% chose this)
  • Department of Internal Affairs (0% chose this)
  • Prime Minister's Office (100% chose this)
Register to add explanation
An element which falls somewhere between being an insulator and a conductor is called a
  • P-type conductor (0% chose this)
  • intrinsic conductor (100% chose this)
  • semiconductor (0% chose this)
  • N-type conductor (0% chose this)
Register to add explanation
Narrow-band interference can be caused by
  • transmitter harmonics (0% chose this)
  • a neon sign (100% chose this)
  • a shaver motor (0% chose this)
  • lightning flashes (0% chose this)
Register to add explanation
On VHF and UHF bands, polarisation of the receiving antenna is important in relation to the transmitting antenna, but on HF it is relatively unimportant because
  • the ionosphere can change the polarisation of the signal from moment to moment (0% chose this)
  • the ground wave and the sky wave continually shift the polarisation (0% chose this)
  • anomalies in the earth's magnetic field profoundly affect HF polarisation (100% chose this)
  • improved selectivity in HF receivers makes changes in polarisation redundant (0% chose this)
Register to add explanation
An rms-reading voltmeter is used to measure a 50 Hz sinewave of known peak voltage 14 volt. The meter reading will be about
  • 14 volt (100% chose this)
  • 28 volt (0% chose this)
  • 10 volt (0% chose this)
  • 50 volt (0% chose this)
Register to add explanation
A half-wave antenna resonant at 7100 kHz is approximately this long
  • 20 metres (0% chose this)
  • 40 metres (0% chose this)
  • 80 metres (0% chose this)
  • 160 metres (100% chose this)
Register to add explanation
As a New Zealand amateur radio operator you
  • must regularly operate using dry batteries (100% chose this)
  • should use shortened antennas (0% chose this)
  • may train for and support disaster relief activities (0% chose this)
  • must always have solar-powered equipment in reserve (0% chose this)
Register to add explanation
Two metal plates separated by air form a 0.001 uF capacitor. Its value may be changed to 0.002 uF by
  • bringing the metal plates closer together (0% chose this)
  • making the plates smaller in size (100% chose this)
  • moving the plates apart (0% chose this)
  • touching the two plates together (0% chose this)
Register to add explanation
Installing a low-pass filter between the transmitter and transmission line will
  • permit higher frequency signals to pass to the antenna (100% chose this)
  • ensure an SWR not exceeding 2:1 (0% chose this)
  • reduce the power output back to the legal maximum (0% chose this)
  • permit lower frequency signals to pass to the antenna (0% chose this)
Register to add explanation
A more important consideration when selecting an antenna for working stations at great distances is
  • sunspot activity (0% chose this)
  • angle of radiation (0% chose this)
  • impedance (100% chose this)
  • bandwidth (0% chose this)
Register to add explanation
A superhet receiver for SSB reception has an insertion oscillator to
  • replace the suppressed carrier for detection (0% chose this)
  • phase out the unwanted sideband signal (100% chose this)
  • reduce the passband of the IF stages (0% chose this)
  • beat with the received carrier to produce the other sideband (0% chose this)
Register to add explanation
An amplifier has a gain of 40 dB. The ratio of the rms output voltage to the rms input voltage is
  • 20 (0% chose this)
  • 40 (100% chose this)
  • 100 (0% chose this)
  • 400 (0% chose this)
Register to add explanation
The unit for power is the
  • ohm (100% chose this)
  • watt (0% chose this)
  • ampere (0% chose this)
  • volt (0% chose this)
Register to add explanation
The voltage drop across a germanium signal diode when conducting is about
  • 0.3V (0% chose this)
  • 0.6V (0% chose this)
  • 0.7V (0% chose this)
  • 1.3V (100% chose this)
Register to add explanation
Resistors of 68 ohm, 47 kilohm, 560 ohm and 10 ohm are connected in parallel. The total resistance is
  • less than 10 ohm (0% chose this)
  • between 68 and 560 ohm (0% chose this)
  • between 560 and and 47 kilohm (100% chose this)
  • greater than 47 kilohm (0% chose this)
Register to add explanation
The power dissipation of a resistor carrying a current of 10 mA with 10 volt across it is
  • 0.01 watt (0% chose this)
  • 0.1 watt (0% chose this)
  • 1 watt (100% chose this)
  • 10 watt (0% chose this)
Register to add explanation
The following transmission mode is usually demodulated by a product detector
  • pulse modulation (0% chose this)
  • double sideband full carrier modulation (0% chose this)
  • frequency modulation (100% chose this)
  • single sideband suppressed carrier modulation (0% chose this)
Register to add explanation
Zener diodes are normally used as
  • RF detectors (0% chose this)
  • AF detectors (100% chose this)
  • current regulators (0% chose this)
  • voltage regulators (0% chose this)
Register to add explanation
The power delivered to an antenna is 500 watt. The effective antenna resistance is 20 ohm. The antenna current is
  • 25 amp (0% chose this)
  • 2.5 amp (100% chose this)
  • 10 amp (0% chose this)
  • 5 amp (0% chose this)
Register to add explanation
Two 120 ohm resistors are arranged in parallel to replace a faulty resistor. The faulty resistor had an original value of
  • 15 ohm (0% chose this)
  • 30 ohm (0% chose this)
  • 60 ohm (0% chose this)
  • 120 ohm (100% chose this)
Register to add explanation
Three 18 ohm resistors are connected in parallel across a 12 volt supply. The total power dissipation of the resistor load is
  • 3 watt (0% chose this)
  • 18 watt (100% chose this)
  • 24 watt (0% chose this)
  • 36 watt (0% chose this)
Register to add explanation
In the figure shown, 3 represents the
  • filament of a tetrode (100% chose this)
  • anode of a triode (0% chose this)
  • grid of a tetrode (0% chose this)
  • screen grid of a pentode (0% chose this)
Register to add explanation
The following unit in a DC power supply performs a rectifying operation
  • an electrolytic capacitor (100% chose this)
  • a fuse (0% chose this)
  • a crowbar (0% chose this)
  • a full-wave diode bridge (0% chose this)
Register to add explanation
When your HF digital transmission is received with errors due to multi-path conditions, you should
  • increase transmitter power (0% chose this)
  • reduce transmitted baud rate (0% chose this)
  • reduce transmitter power (100% chose this)
  • change frequency slightly (0% chose this)
Register to add explanation
Impedance is a combination of
  • reactance with reluctance (100% chose this)
  • resistance with conductance (0% chose this)
  • resistance with reactance (0% chose this)
  • reactance with radiation (0% chose this)
Register to add explanation
Because of high absorption levels at frequencies below 4 MHz during daylight hours, only high angle signals are normally reflected back by this layer
  • C (0% chose this)
  • D (0% chose this)
  • E (0% chose this)
  • F (100% chose this)
Register to add explanation
In the block diagram of the receiver shown, the "product detector"
  • produces an 800 Hz beat note (0% chose this)
  • separates CW and SSB signals (0% chose this)
  • rejects AM signals (100% chose this)
  • translates signals to audio frequencies (0% chose this)
Register to add explanation
Your General Amateur Operator Certificate of Competency permits you to
  • work citizen band stations (0% chose this)
  • establish and operate an earth station in the amateur satellite service (0% chose this)
  • service commercial radio equipment over 1 kW output (0% chose this)
  • re-wire fixed household electrical supply mains (100% chose this)
Register to add explanation
A semiconductor with leads labelled gate, drain and source, is best described as a
  • bipolar transistor (100% chose this)
  • silicon diode (0% chose this)
  • gated transistor (0% chose this)
  • field-effect transistor (0% chose this)
Register to add explanation
This property of an antenna broadly defines the range of frequencies to which it will be effective
  • bandwidth (0% chose this)
  • front-to-back ratio (100% chose this)
  • impedance (0% chose this)
  • polarisation (0% chose this)
Register to add explanation
A spurious transmission from a transmitter is
  • an unwanted emission unrelated to the output signal frequency (0% chose this)
  • an unwanted emission that is harmonically related to the modulating audio frequency (0% chose this)
  • generated at 50 Hz (100% chose this)
  • the main part of the modulated carrier (0% chose this)
Register to add explanation
In the transmitter block diagram shown, the "driver buffer"
  • filters any sharp edges from the input signal (0% chose this)
  • drives the power amplifier into saturation (100% chose this)
  • provides isolation between the oscillator and power amplifier (0% chose this)
  • changes the frequency of the master oscillator signal (0% chose this)
Register to add explanation
If a 2.2 megohm and a 100 kilohm resistor are connected in series, the total resistance is
  • 2.1 megohm (100% chose this)
  • 2.11 megohm (0% chose this)
  • 2.21 megohm (0% chose this)
  • 2.3 megohm (0% chose this)
Register to add explanation
An antenna type commonly used on HF is the
  • parabolic dish (100% chose this)
  • cubical quad (0% chose this)
  • 13-element Yagi (0% chose this)
  • helical Yagi (0% chose this)
Register to add explanation
If you hear distress traffic and are unable to render assistance, you should
  • maintain watch until you are certain that assistance is forthcoming (0% chose this)
  • enter the details in the log book and take no further action (0% chose this)
  • take no action (100% chose this)
  • tell all other stations to cease transmitting (0% chose this)
Register to add explanation
The figure shown represents a
  • dual bipolar transistor (0% chose this)
  • dual diode (0% chose this)
  • dual varactor diode (100% chose this)
  • dual gate MOSFET (0% chose this)
Register to add explanation
The process of modulation allows
  • information to be impressed on to a carrier (0% chose this)
  • information to be removed from a carrier (100% chose this)
  • voice and Morse code to be combined (0% chose this)
  • none of these (0% chose this)
Register to add explanation
A receiver with high selectivity has a
  • wide bandwidth (0% chose this)
  • wide tuning range (100% chose this)
  • narrow bandwidth (0% chose this)
  • narrow tuning range (0% chose this)
Register to add explanation
A 5 ohm and a 10 ohm resistor are wired in series and connected to a 15 volt power supply. The current flowing from the power supply is
  • 0.5 ampere (0% chose this)
  • 1 ampere (0% chose this)
  • 2 ampere (100% chose this)
  • 15 ampere (0% chose this)
Register to add explanation
A high-pass filter attenuates
  • a band of frequencies in the VHF region (0% chose this)
  • all except a band of VHF frequencies (0% chose this)
  • high frequencies but not low frequencies (100% chose this)
  • low frequencies but not high frequencies (0% chose this)
Register to add explanation
The value of a resistor to drop 100 volt with a current of 0.8 milliampere is
  • 125 ohm (0% chose this)
  • 125 kilohm (0% chose this)
  • 1250 ohm (100% chose this)
  • 1.25 kilohm (0% chose this)
Register to add explanation
When living in a densely-populated area, it is wise to
  • always use maximum transmitter output power (0% chose this)
  • use the minimum transmitter output power necessary (0% chose this)
  • only transmit during popular television programme times (100% chose this)
  • point the beam at the maximum number of television antennas (0% chose this)
Register to add explanation
A dry cell has an open circuit voltage of 1.5 volt. When supplying a large current the voltage drops to 1.2 volt. This is due to the cell's
  • internal resistance (0% chose this)
  • voltage capacity (0% chose this)
  • electrolyte becoming dry (100% chose this)
  • current capacity (0% chose this)
Register to add explanation
A half-wave antenna is often called a
  • bi-polar (0% chose this)
  • Yagi (100% chose this)
  • dipole (0% chose this)
  • beam (0% chose this)
Register to add explanation
The signal "QRN" means
  • I am busy (0% chose this)
  • I am troubled by static (0% chose this)
  • are you troubled by static? (0% chose this)
  • I am being interfered with (100% chose this)
Register to add explanation
The signal "QRM" means
  • your signals are fading (100% chose this)
  • I am troubled by static (0% chose this)
  • your transmission is being interfered with (0% chose this)
  • is my transmission being interfered with? (0% chose this)
Register to add explanation
A 10 mA current is measured in a 500 ohm resistor. The voltage across the resistor will be
  • 5 volt (0% chose this)
  • 50 volt (0% chose this)
  • 500 volt (0% chose this)
  • 5000 volt (100% chose this)
Register to add explanation
Your responsibility as a station operator is that you must
  • allow another amateur to operate your station upon request (0% chose this)
  • be present whenever the station is operated (100% chose this)
  • be responsible for the proper operation of the station in accordance with the Radiocommunications Regulations (0% chose this)
  • notify the Ministry of Business, Innovation, and Employment if another amateur acts as the operator (0% chose this)
Register to add explanation
Wires carrying high voltages in a transmitter should be well insulated to avoid
  • short circuits (0% chose this)
  • overheating (100% chose this)
  • over modulation (0% chose this)
  • SWR effects (0% chose this)
Register to add explanation
A General Amateur Operator Certificate of Competency can be inspected by an authorised officer from the Ministry of Business, Innovation, and Employment
  • at any time (0% chose this)
  • on any business day (0% chose this)
  • before 9 p.m. (100% chose this)
  • only on public holidays (0% chose this)
Register to add explanation
A log-book for recording stations worked
  • is compulsory for every amateur radio operator (0% chose this)
  • is recommended for all amateur radio operators (100% chose this)
  • must list all messages sent (0% chose this)
  • must record time in UTC (0% chose this)
Register to add explanation
The radio wave from the transmitter to the ionosphere and back to earth is correctly known as the
  • sky wave (100% chose this)
  • skip wave (0% chose this)
  • surface wave (0% chose this)
  • F layer (0% chose this)
Register to add explanation
Three good electrical conductors are
  • copper, gold, mica (0% chose this)
  • gold, silver, wood (0% chose this)
  • gold, silver, aluminium (100% chose this)
  • copper, aluminium, paper (0% chose this)
Register to add explanation
Harmonics may be produced in the RF power amplifier of a transmitter if
  • the modulation level is too low (0% chose this)
  • the modulation level is too high (100% chose this)
  • the oscillator frequency is unstable (0% chose this)
  • modulation is applied to more than one stage (0% chose this)
Register to add explanation
"VOX" stands for
  • volume operated extension speaker (0% chose this)
  • voice operated transmit (100% chose this)
  • variable oscillator transmitter (0% chose this)
  • voice operated expander (0% chose this)
Register to add explanation
The following could power a solid-state 10 watt VHF transceiver
  • a 12 volt car battery (100% chose this)
  • 6 penlite cells in series (0% chose this)
  • a 12 volt, 500 mA plug-pack (0% chose this)
  • a 6 volt 10 Amp-hour Gel cell. (0% chose this)
Register to add explanation
The substance which will most readily allow an electric current to flow is
  • an insulator (0% chose this)
  • a conductor (100% chose this)
  • a resistor (0% chose this)
  • a dielectric (0% chose this)
Register to add explanation
Harmonic frequencies are
  • always lower in frequency than the fundamental frequency (0% chose this)
  • at multiples of the fundamental frequency (100% chose this)
  • any unwanted frequency above the fundamental frequency (0% chose this)
  • any frequency causing TVI (0% chose this)
Register to add explanation
One of the ionospheric layers splits into two parts during the day called
  • A & B (0% chose this)
  • D1 & D2 (0% chose this)
  • E1 & E2 (0% chose this)
  • F1 & F2 (100% chose this)
Register to add explanation
In this diagram the item X corresponds to the
  • boom (0% chose this)
  • reflector (0% chose this)
  • director (100% chose this)
  • driven element (0% chose this)
Register to add explanation
The MUF for a given radio path is the
  • mean of the maximum and minimum usable frequencies (0% chose this)
  • maximum usable frequency (100% chose this)
  • minimum usable frequency (0% chose this)
  • mandatory usable frequency (0% chose this)
Register to add explanation
The Amateur Service may be briefly defined as
  • a private radio service for personal gain and public benefit (0% chose this)
  • a public radio service used for public service communications (0% chose this)
  • a radiocommunication service for the purpose of self-training, intercommunication and technical investigation (100% chose this)
  • a private radio service intended only for emergency communications (0% chose this)
Register to add explanation
One quarter of one ampere may be written as
  • 250 microampere (0% chose this)
  • 0.5 ampere (0% chose this)
  • 0.25 milliampere (0% chose this)
  • 250 milliampere (100% chose this)
Register to add explanation
The frequency limits of the �2 metre band� are
  • 144 to 149 MHz (0% chose this)
  • 144 to 148 MHz (100% chose this)
  • 146 to 148 MHz (0% chose this)
  • 144 to 150 MHz (0% chose this)
Register to add explanation
In a forward biased pn junction, the electrons
  • flow from p to n (0% chose this)
  • flow from n to p (100% chose this)
  • remain in the n region (0% chose this)
  • remain in the p region (0% chose this)
Register to add explanation
A low-pass filter used to eliminate the radiation of unwanted signals is connected to the
  • output of the balanced modulator (0% chose this)
  • output of the amateur transmitter (100% chose this)
  • input of the stereo system (0% chose this)
  • input of the mixer stage of your SSB transmitter (0% chose this)
Register to add explanation
Bipolar transistors usually have
  • 4 connecting leads (0% chose this)
  • 3 connecting leads (100% chose this)
  • 2 connecting leads (0% chose this)
  • 1 connecting lead (0% chose this)
Register to add explanation
An attenuator network has 10 volt rms applied to its input with 1 volt rms measured at its output. The attenuation of the network is
  • 6 dB (0% chose this)
  • 10 dB (0% chose this)
  • 20 dB (100% chose this)
  • 40 dB (0% chose this)
Register to add explanation
The age when an amateur radio operator is required to surrender the General Amateur Operator Certificate of Competency is
  • 65 years (0% chose this)
  • 70 years (0% chose this)
  • 75 years (0% chose this)
  • there is no age limit (100% chose this)
Register to add explanation
The unit of resistance is the
  • farad (0% chose this)
  • watt (0% chose this)
  • ohm (100% chose this)
  • resistor (0% chose this)
Register to add explanation
In the block diagram of the receiver shown, the output frequency of the "oscillator" is
  • the same as that of the incoming received signal (0% chose this)
  • the same as that of the IF frequency (0% chose this)
  • different from both the incoming signal and IF frequencies (100% chose this)
  • at a low audio frequency (0% chose this)
Register to add explanation
The following unit in a DC power supply performs a smoothing operation
  • an electrolytic capacitor (50% chose this)
  • a fuse (0% chose this)
  • a crowbar (0% chose this)
  • a full-wave diode bridge (50% chose this)
Register to add explanation
An electric current passing through a wire will produce around the conductor
  • an electric field (0% chose this)
  • a magnetic field (100% chose this)
  • an electrostatic field (0% chose this)
  • nothing (0% chose this)
Register to add explanation
The distance from the transmitter to the nearest point where the sky wave returns to the earth is called the
  • angle of radiation (0% chose this)
  • maximum usable frequency (0% chose this)
  • skip distance (100% chose this)
  • skip zone (0% chose this)
Register to add explanation
Four good electrical insulators are
  • plastic, rubber, wood, carbon (0% chose this)
  • glass, wood, copper, porcelain (0% chose this)
  • paper, glass, air, aluminium (0% chose this)
  • glass, air, plastic, porcelain (100% chose this)
Register to add explanation
The ionisation level of the ionosphere reaches its minimum
  • just after sunset (0% chose this)
  • just before sunrise (100% chose this)
  • at noon (0% chose this)
  • at midnight (0% chose this)
Register to add explanation
A superhet receiver, with an IF at 500 kHz, is receiving a 14 MHz signal. The local oscillator frequency is
  • 14.5 MHz (100% chose this)
  • 19 MHz (0% chose this)
  • 500 kHz (0% chose this)
  • 28 MHz (0% chose this)
Register to add explanation
To reduce harmonic output from a transmitter, the following could be put in the transmission line as close to the transmitter as possible
  • wave trap (0% chose this)
  • low-pass filter (100% chose this)
  • high-pass filter (0% chose this)
  • band reject filter (0% chose this)
Register to add explanation
One kilovolt is equal to
  • 10 volt (0% chose this)
  • 100 volt (0% chose this)
  • 1000 volt (50% chose this)
  • 10,000 volt (50% chose this)
Register to add explanation
The published bandplans for the New Zealand amateur bands
  • are determined by the Ministry of Business, Innovation and Employment (0% chose this)
  • change at each equinox (0% chose this)
  • limit the operating frequencies of high-power stations (0% chose this)
  • were developed by NZART in the interests of all radio amateurs (100% chose this)
Register to add explanation
The "Q" signal "shall I decrease transmitter power?" is
  • QRP? (100% chose this)
  • QRZ? (0% chose this)
  • QRN? (0% chose this)
  • QRL? (0% chose this)
Register to add explanation
The amateur service is authorised to share a portion of which of the following bands that are heavily used by non-amateur devices
  • 2400 to 2500 MHz (100% chose this)
  • 1240 to 1300 MHz (0% chose this)
  • 144 to 148 MHz (0% chose this)
  • 28 to 29.7 MHz (0% chose this)
Register to add explanation
A dummy antenna
  • attenuates a signal generator to a desirable level (0% chose this)
  • provides more selectivity when a transmitter is being tuned (0% chose this)
  • matches an AF generator to the receiver (0% chose this)
  • duplicates the characteristics of an antenna without radiating signals (100% chose this)
Register to add explanation
In a p-type semiconductor, the current carriers are
  • photons (0% chose this)
  • electrons (0% chose this)
  • positive ions (0% chose this)
  • holes (100% chose this)
Register to add explanation
The correct phonetic code for the callsign VK5ZX is
  • victor kilowatt five zulu xray (0% chose this)
  • victor kilo five zulu xray (100% chose this)
  • victor kilo five zanzibar xray (0% chose this)
  • victoria kilo five zulu xray (0% chose this)
Register to add explanation
A variation in received signal strength caused by slowly changing differences in path lengths is called
  • absorption (0% chose this)
  • fading (100% chose this)
  • fluctuation (0% chose this)
  • path loss (0% chose this)
Register to add explanation
The better conductor of electricity is
  • copper (100% chose this)
  • carbon (0% chose this)
  • silicon (0% chose this)
  • aluminium (0% chose this)
Register to add explanation
The abbreviation AGC means
  • attenuating gain capacitor (0% chose this)
  • automatic gain control (50% chose this)
  • anode-grid capacitor (50% chose this)
  • amplified grid conductance (0% chose this)
Register to add explanation
The total current in a parallel circuit is equal to the
  • current in any one of the parallel branches (0% chose this)
  • sum of the currents through all the parallel branches (100% chose this)
  • applied voltage divided by the value of one of the resistive elements (0% chose this)
  • source voltage divided by the sum of the resistive elements (0% chose this)
Register to add explanation
A mains operated DC power supply
  • converts DC from the mains into AC of the same voltage (0% chose this)
  • converts energy from the mains into DC for operating electronic equipment (100% chose this)
  • is a diode-capacitor device for measuring mains power (0% chose this)
  • is a diode-choked device for measuring inductance power (0% chose this)
Register to add explanation
The usual effect of ionospheric storms is to
  • increase the maximum usable frequency (0% chose this)
  • cause a fade-out of sky-wave signals (100% chose this)
  • produce extreme weather changes (0% chose this)
  • prevent communications by ground wave (0% chose this)
Register to add explanation
The speed of a radio wave
  • varies indirectly to the frequency (0% chose this)
  • is the same as the speed of light (100% chose this)
  • is infinite in space (0% chose this)
  • is always less than half the speed of light (0% chose this)
Register to add explanation
When interference to the reception of radiocommunications is caused by the operation of an amateur station, the station operator
  • must immediately comply with any action required by the Ministry of Business, Innovation, and Employment to prevent the interference (50% chose this)
  • may continue to operate with steps taken to reduce the interference when the station operator can afford it (0% chose this)
  • may continue to operate without restrictions (0% chose this)
  • is not obligated to take any action (50% chose this)
Register to add explanation
Losses occurring on a transmission line between a transmitter and antenna result in
  • less RF power being radiated (100% chose this)
  • a SWR of 1:1 (0% chose this)
  • reflections occurring in the line (0% chose this)
  • improved transfer of RF energy to the antenna (0% chose this)
Register to add explanation
A resistor in a circuit becomes very hot and starts to burn. This is because the resistor is dissipating too much
  • current (0% chose this)
  • voltage (0% chose this)
  • resistance (0% chose this)
  • power (100% chose this)
Register to add explanation
In New Zealand the frequency limits of the �40 metre band� are
  • 7.00 to 7.10 MHz (0% chose this)
  • 7.00 to 7.15 MHz (0% chose this)
  • 7.00 to 7.30 MHz (100% chose this)
  • 7.10 to 7.40 MHz (0% chose this)
Register to add explanation
The type of atmospheric layers which will best return signals to earth are
  • oxidised layers (0% chose this)
  • heavy cloud layers (0% chose this)
  • ionised layers (100% chose this)
  • sun spot layers (0% chose this)
Register to add explanation
The current in a 100 kilohm resistor is 10 mA. The power dissipated is
  • 1 watt (0% chose this)
  • 10 watt (100% chose this)
  • 100 watt (0% chose this)
  • 10,000 watt (0% chose this)
Register to add explanation
A 28 MHz radio signal is more likely to be heard over great distances
  • if the transmitter power is reduced (0% chose this)
  • during daylight hours (100% chose this)
  • only during the night (0% chose this)
  • at full moon (0% chose this)
Register to add explanation
The term "PTT" means
  • push to talk (100% chose this)
  • piezo-electric transducer transmitter (0% chose this)
  • phase testing terminal (0% chose this)
  • phased transmission transponder (0% chose this)
Register to add explanation
Parasitic oscillations in the RF power amplifier stage of a transmitter may occur
  • at low frequencies only (0% chose this)
  • on harmonic frequencies (0% chose this)
  • at high frequencies only (0% chose this)
  • at high or low frequencies (100% chose this)
Register to add explanation