Canadian Advanced pool, section 2-09

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Subelement 2

Advanced Components and Circuits

Section 2-09

mixers, frequency multipliers

2-09-01

What is the mixing process?

A.
The elimination of noise in a wideband receiver by phase differentiation
B.
The recovery of intelligence from a modulated signal
Correct Answer
C.
The combination of two signals to produce sum and difference frequencies
D.
The elimination of noise in a wideband receiver by phase comparison

2-09-01

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2-09-02

What are the principal frequencies that appear at the output of a mixer circuit?

Correct Answer
A.
The original frequencies and the sum and difference frequencies
B.
1.414 and 0.707 times the input frequencies
C.
The sum, difference and square root of the input frequencies
D.
Two and four times the original frequency

2-09-02

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2-09-03

What occurs when an excessive amount of signal energy reaches the mixer circuit?

A.
Automatic limiting occurs
Correct Answer
B.
Spurious signals are generated
C.
A beat frequency is generated
D.
Mixer blanking occurs

2-09-03

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2-09-04

In a frequency multiplier circuit, the input signal is coupled to the base of a transistor through a capacitor. A radio frequency choke is connected between the base of the transistor and ground. The capacitor is:

Correct Answer
A.
a DC blocking capacitor
B.
part of the input tuned circuit
C.
a by-pass for the circuit
D.
part of the output tank circuit

2-09-04

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2-09-05

A frequency multiplier circuit must be operated in:

A.
class AB
B.
class B
C.
class A
Correct Answer
D.
class C

2-09-05

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2-09-06

In a frequency multiplier circuit, an inductance (L1) and a variable capacitor (C2) are connected in series between VCC+ and ground. The collector of a transistor is connected to a tap on L1. The purpose of the variable capacitor is to:

Correct Answer
A.
tune L1 to the desired harmonic
B.
by-pass RF
C.
tune L1 to the frequency applied to the base
D.
provide positive feedback

2-09-06

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2-09-07

A.
form a pi filter with L1 and C2
B.
resonate with L1
Correct Answer
C.
keep RF out of the power supply
D.
by-pass any audio components

2-09-07

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2-09-08

A.
frequency divider
Correct Answer
B.
frequency multiplier
C.
voltage divider
D.
voltage doubler

2-09-08

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2-09-09

In a circuit where the components are tuned to resonate at a higher frequency than applied, the circuit is most likely a:

Correct Answer
A.
a frequency multiplier
B.
a VHF/UHF amplifier
C.
a linear amplifier
D.
a frequency divider

2-09-09

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2-09-10

A.
DC blocking capacitor
B.
tuning capacitor
Correct Answer
C.
RF by-pass capacitor
D.
coupling capacitor

2-09-10

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2-09-11

What stage in a transmitter would change a 5.3-MHz input signal to 14.3 MHz?

A.
A linear translator
B.
A frequency multiplier
Correct Answer
C.
A mixer
D.
A beat frequency oscillator

2-09-11

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