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Malvino: MCQ in Oscillators

MCQs in Oscillators

This is the Multiple Choice Questions in Chapter 23: Oscillators from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

  • MCQs in Theory of Sinusoidal Oscillation
  • MCQs in Wien-Bridge Oscillator
  • MCQs in Other RC Oscillators
  • MCQs in Colpitts Oscillator
  • MCQs in Other LC Oscillators
  • MCQs in Quartz Crystals
  • MCQs in 555 Timer
  • MCQs in Astable Operation of 555 Timer
  • MCQs in 555 Circuits
  • MCQs in Phase-Locked Loop
  • MCQs in Function Generator ICs

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1 . An oscillator always needs an amplifier with

  • a. Positive feedback
  • b. Negative feedback
  • c. Both types of feedback
  • d. An LC tank circuit

2. The voltage that starts an oscillator is caused by

  • a. Ripple from the power supply
  • b. Noise voltage in resistors
  • c. The input signal from a generator
  • d. Positive feedback

3. The Wien-bridge oscillator is useful

  • a. At low frequencies
  • b. At high frequencies
  • c. With LC tank circuits
  • d. At small input signals

4. A lag circuit has a phase angle that is

  • a. Between 0 and +90 degrees
  • b. Greater than 90 degrees
  • c. Between 0 and -90 degrees
  • d. The same as the input voltage

5. A coupling circuit is a

  • a. Lag circuit
  • b. Lead circuit
  • c. Lead-lag circuit
  • d. Resonant circuit

6. A lead circuit has a phase angle that is

  • a. Between 0 and +90 degrees
  • b. Greater than 90 degrees
  • c. Between 0 and -90 degrees
  • d. The same as the input voltage

7. A Wien-bridge oscillator uses

  • a. Positive feedback
  • b. Negative feedback
  • c. Both types of feedback
  • d. An LC tank circuit

8. Initially, the loop gain of a Wien-bridge oscillator is

  • a. 0
  • b. 1
  • c. Low
  • d. High

9. A Wien bridge is sometimes called a

  • a. Notch filter
  • b. Twin-T oscillator
  • c. Phase shifter
  • d. Wheatstone bridge

10. To vary the frequency of a Wien bridge, you can vary

  • a. One resistor
  • b. Two resistors
  • c. Three resistors
  • d. One capacitor

11. The phase-shift oscillator usually has

  • a. Two lead or lag circuits
  • b. Three lead or fagcircuits
  • c. A lead-lag circuit
  • d. A twin-T filter

12. For oscillations to start in a circuit, the loop gain must be greater than 1 when the phase shift around the loop is

  • a. 90 degrees
  • b. 180 degrees
  • c. 270 degrees
  • d. 360 degrees

13. The most widely used LC oscillator is the

  • a. Armstrong
  • b. Clapp
  • C. Colpitts
  • d. Hartley

14. Heavy feedback in an LC oscillator

  • a. Prevents the circuit from starting
  • b. Causes saturation and cutoff
  • c. Produces maximum output voltage
  • d. Means B is small

15. When Q decreases in a Colpitts oscillator, the frequency of oscillation

  • a. Decreases
  • b. Remains the same
  • c. Increases
  • d. Becomes erratic

16. Link coupling refers to

  • a. Capacitive coupling
  • b. Transformer coupling
  • c. Resistive coupling
  • d. Power coupling

17. The Hartley oscillator uses

  • a. Negative feedback
  • b. Two inductors
  • c. A tungsten lamp
  • d. A tickler coil

18. To vary the frequency of an LC oscillator, you can vary

  • a. One resistor
  • b. Two resistors
  • c. Three resistors
  • d. One capacitor

19. Of the following, the one with the most stable frequency is the

  • a. Armstrong
  • b. Clapp
  • c. Colpitts
  • d. Hartley

20. The material with the piezoelectric effect is

  • a. Quartz
  • b. Rochelle salts
  • c. Tourmaline
  • d. All the above

21. Crystals have a very

  • a. Low Q
  • b. High Q
  • c. Small inductance
  • d. Large resistance

22. The series and parallel resonant frequencies of a crystal are

  • a. Very close together
  • b. Very far apart
  • c. Equal
  • d. Low frequencies

23. The kind of oscillator found in an electronic wristwatch is the

  • a. Armstrong
  • b. Clapp
  • c. Colpitts
  • d. Quartz crystal

24. A monostable 555 timer has the following number of stable states:

  • a. 0
  • b. 1
  • c. 2
  • d. 3

25. An astable 555 timer has the following number of stable states:

  • a. 0
  • b. 1
  • c. 2
  • d. 3

26. The pulse width out of a one-shot multivibrator increases when the

  • a. Supply voltage increases
  • b. Timing resistor decreases
  • c. UTP decreases
  • d. Timing capacitance increases

27. The output waveform of a 555 timer is

  • a. sinusoidal
  • b. triangular
  • c. rectangular
  • d. elliptical

28. The quantity that remains constant in a pulse-width modulator is

  • a. Pulse width
  • b. Period
  • c. Duty cycle
  • d. Space

29. The quantity that remains constant in a pulse-position modulator is

  • a. Pulse width
  • b. Period
  • c. Duty cycle
  • d. Space

30. When a PLL is locked on the input frequency, the VCO frequency

  • a. Is less than f0
  • b. Is greater than f0
  • c. Equals f0
  • d. Equals fin

31. The bandwidth of the low-pass filter in a PLL determines the

  • a. Capture range
  • b. Lock range
  • c. Free-running frequency
  • d. Phase difference

Check your work.

Complete List of MCQ in Electronic Principles by Albert Malvino

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  1. Kalpana Patel
    • engr

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