Canadian Advanced pool, section 2-12

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Subelement 2

Advanced Components and Circuits

Section 2-12

advanced filter circuits - AF, RF

2-12-01

What are the three general groupings of filters?

A.
Hartley, Colpitts and Pierce
B.
Audio, radio and capacitive
Correct Answer
C.
High-pass, low-pass and band-pass
D.
Inductive, capacitive and resistive

2-12-01

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2-12-02

What are the distinguishing features of a Butterworth filter?

A.
The product of its series and shuntelement impedances is a constant for all frequencies
B.
It only requires conductors
Correct Answer
C.
It has a maximally flat response over its pass-band
D.
It only requires capacitors

2-12-02

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2-12-03

Which filter type is decribed as having ripple in the passband and a sharp cutoff?

A.
An active LC filter
B.
A passive op-amp filter
Correct Answer
C.
A Chebyshev filter
D.
A Butterworth filter

2-12-03

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2-12-04

What are the distinguishing features of a Chebyshev filter?

A.
It requires only inductors
Correct Answer
B.
It allows ripple in the passband in return for steeper skirts
C.
It requires only capacitors
D.
It has a maximally flat response in the passband

2-12-04

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2-12-05

Resonant cavities are used by amateurs as a:

A.
power line filter
B.
low pass-filter below 30 MHz
Correct Answer
C.
narrow bandpass filter at VHF and higher frequencies
D.
high pass-filter above 30 MHz

2-12-05

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2-12-06

On VHF and above, 1/4 wavelength coaxial cavities are used to give protection from high-level signals. For a frequency of approximatively 50 MHz, the diameter of such a device would be about four inches (10 cm). What would be its approximate length?

Correct Answer
A.
1.5 metres (5 ft)
B.
0.6 metres (2 ft)
C.
2.4 metres (8 ft)
D.
3.7 metres (12 ft)

2-12-06

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2-12-07

A device which helps with receiver overload and spurious responses at VHF, UHF and above may be installed in the receiver front end. It is called a:

Correct Answer
A.
helical resonator
B.
diplexer
C.
directional coupler
D.
duplexer

2-12-07

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2-12-08

Where you require bandwidth at VHF and higher frequencies about equal to a television channel, a good choice of filter is the:

A.
resonant cavity
B.
Butterworth
C.
Chebyshev
Correct Answer
D.
None of the above

2-12-08

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2-12-09

What is the primary advantage of the Butterworth filter over the Chebyshev filter?

A.
It allows ripple in the passband in return for steeper skirts
B.
It requires only inductors
C.
It requires only capacitors
Correct Answer
D.
It has maximally flat response over its passband

2-12-09

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2-12-10

What is the primary advantage of the Chebyshev filter over the Butterworth filter?

A.
It requires only capacitors
B.
It requires only inductors
Correct Answer
C.
It allows ripple in the passband in return for steeper skirts
D.
It has maximally flat response over the passband

2-12-10

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2-12-11

Which of the following filter types Is Not suitable for use at audio and low radio frequencies?

A.
Elliptical
B.
Chebyshev
Correct Answer
C.
Cavity
D.
Butterworth

2-12-11

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