Canadian Advanced pool, section 2-11

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Subelement 2

Advanced Components and Circuits

Section 2-11

quartz crystal - properties and applications

2-11-01

What is a crystal lattice filter?

A.
A filter with wide bandwidth and shallow skirts made using quartz crystals
B.
An audio filter made with four quartz crystals that resonate at 1 kHz intervals
Correct Answer
C.
A filter with narrow bandwidth and steep skirts made using quartz crystals
D.
A power supply filter made with interlaced quartz crystals

2-11-01

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2-11-02

What factor determines the bandwidth and response shape of a crystal lattice filter?

Correct Answer
A.
The relative frequencies of the individual crystals
B.
The centre frequency chosen for the filter
C.
The gain of the RF stage following the filter
D.
The amplitude of the signals passing through the filter

2-11-02

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2-11-03

For single-sideband phone emissions, what would be the bandwidth of a good crystal lattice filter?

A.
15 kHz
B.
500 Hz
Correct Answer
C.
2.1 kHz
D.
6 kHz

2-11-03

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2-11-04

The main advantage of a crystal oscillator over a tuned LC oscillator is:

A.
longer life under severe operating use
B.
freedom from harmonic emissions
C.
simplicity
Correct Answer
D.
much greater frequency stability

2-11-04

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2-11-05

A quartz crystal filter is superior to an LC filter for narrow bandpass applications because of the:

A.
crystal's low Q
B.
LC circuit's high Q
C.
crystal's simplicity
Correct Answer
D.
crystal's high Q

2-11-05

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2-11-06

Piezoelectricity is generated by:

A.
touching crystals with magnets
B.
adding impurities to a crystal
Correct Answer
C.
deforming certain crystals
D.
moving a magnet near a crystal

2-11-06

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2-11-07

Electrically, what does a crystal look like?

Correct Answer
A.
A very high Q tuned circuit
B.
A very low Q tuned circuit
C.
A variable capacitance
D.
A variable tuned circuit

2-11-07

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2-11-08

Crystals are sometimes used in a circuit which has an output an integral multiple of the crystal frequency. This circuit is called:

A.
a crystal multiplier
B.
a crystal lattice
C.
a crystal ladder
Correct Answer
D.
an overtone oscillator

2-11-08

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2-11-09

Which of the following properties Does Not apply to a crystal when used in an oscillator circuit?

Correct Answer
A.
High power output
B.
Good frequency stability
C.
Very low noise because of high Q
D.
Good frequency accuracy

2-11-09

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2-11-10

Crystal oscillators, filters and microphones depend upon which principle?

Correct Answer
A.
Piezoelectric effect
B.
Hertzberg effect
C.
Ferro-resonance
D.
Overtone effect

2-11-10

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2-11-11

Crystals are Not applicable to which of the following?

Correct Answer
A.
Active filters
B.
Microphones
C.
Lattice filters
D.
Oscillators

2-11-11

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