EEET 201 - Quiz 5 ...

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EEET 201 - Quiz 5
ID
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Refer to the figure above. Which of these circuits is known as a Colpitts oscillator? 1) _______
A) (a) B) (b)
C) (c) D) None of the above.
2) Of the following oscillator circuit components, the one that exhibits the piezoelectric effect is the 2) _______
A) capacitor. B) crystal. C) inductor. D) resistor.
3) Nonsinusoidal oscillators produce 3) _______
A) sine waves only. B) square waves.
C) triangle waves. D) Either B or C above.

4) The 555 timer contains 4) _______
A) 4 comparators. B) 3 comparators. C) 2 comparators. D) 5 comparators.
5) Which of the following is not an essential requirement of a feedback oscillator? 5) _______
A) Phase shift around the feedback loop of 0°
B) Positive feedback network
C) Negative feedback network
D) Amplifier circuit
6) In order to sustain oscillations in a feedback oscillator, the gain should be ________ so the product
of AV × B equals ________.
A) increased, more than one B) increased, much greater than one
C) reduced, less than one D) reduced, one
6) _______
7) A Wien-bridge oscillator uses 7) _______
A) positive feedback. B) negative feedback.
C) both types of feedback. D) an LC tank circuit.
8) The closed-loop voltage gain, ACL, for a Wien-bridge oscillator is 8) _______
A) less than 1. B) exactly 1.
C) slightly greater than 1. D) 3, after the oscillations have built up.
9) When Q decreases in a Colpitts oscillator, the frequency of oscillation 9) _______
A) decreases. B) is unpredictable.
C) increases. D) remains the same.
10) The Q of a crystal 10) ______
A) is about 10 or so in most cases. B) is extremely high.
C) is extremely low. D) None of the above.

1) A
2) B
3) D
4) C
5) C
6) D
7) C
8) D
9) A
10) B