This is the Multiples Choice Questions Part 10 of the Series in Electronic (Audio/RF) Circuit, Analysis and Design as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

#### MCQ Topic Outline included in ECE Board Exam Syllabi

- MCQ in Amplifiers
- MCQ in Oscillators
- MCQ in Rectifier
- MCQ in Filters
- MCQ in Voltage Regulation

#### Continue Practice Exam Test Questions Part 10 of the Series

**Choose the letter of the best answer in each questions.**

1. An amplifier basically constructed from two transistors and whose output is proportional to the difference between the voltages applied to its two inputs.

A. differential amplifier

B. cascode amplifier

C. complementary amplifier

D. quasi-complementary amplifier

Answer: **Option A**

Solution:

2. It is a very high-gain differential amplifier with very high input impedance and very low output impedance.

A. par-amp

B. op-amp

C. differential amp

D. complementary amp

Answer: **Option B**

Solution:

3. Ideally, op-amps have infinite input resistance and ________ output resistance.

A. infinite

B. zero

C. variable

D. a highly stabilized

Answer: **Option B**

Solution:

4. When the same signal is applied to both inverting and non-inverting input terminals of an ideal op-amp, the output voltage would be

A. zero (0) V

B. +VSAT

C. –VSAT

D. offset voltage

Answer: **Option A**

Solution:

5. The operating mode of an op-amp, when both inputs are tied together or when the input signal is common to both inputs.

A. differential mode

B. rejection mode

C. double-ended mode

D. common mode

Answer: **Option D**

Solution:

6. What do you call of the gain of an op-amp if operated in common mode input?

A. differential gain

B. common gain

C. double-ended gain

D. rejection gain

Answer: **Option B**

Solution:

7. When one input of the op-amp is connected to ground and the other is to the signal source, its operation is called

A. single-ended output

B. double-ended output

C. single-ended input

D. double-ended input

Answer: **Option C**

Solution:

8. If op-amps are operated in differential mode, its gain is technically termed as

A. common-mode differential gain

B. differential gain

C. open-loop gain

D. closed-loop gain

Answer: **Option B**

Solution:

9. The ratio of the differential gain and common gain of an op-amp

A. differential-common mode ratio

B. common-mode ratio

C. differential-mode rejection ratio

D. common-mode rejection ratio

Answer: **Option D**

Solution:

10. An operational amplifier has a common-mode voltage gain of 10 and a differential-mode voltage gain of 20,000, calculate its common-mode rejection ratio (CMRR).

A. 200

B. 2,000

C. 20,000

D. 200,000

Answer: **Option B**

Solution:

11. Calculate the CMRR of an op-amp having a common-mode gain of 10 and a differential-mode gain of 100,000.

A. 1000 dB

B. 100 dB

C. 80 dB

D. 40 dB

Answer: **Option C**

Solution:

12. What is the maximum output voltage swing of an op-amp?

A. +V to -V (supply voltage)

B. +VSAT to -VSAT

C. +½V to -½V

D. depends on the input signal

Answer: **Option B**

Solution:

13. The µA741 op-amp has a CMRR of 90dB and a differential-mode voltage amplification of 200,000.What is the op-amp’s common-mode voltage gain?

A. 31,622.778

B. 632.40

C. 6.324

D. 0.158

Answer: **Option C**

Solution:

14. The current needed at the input of an op-amp to operate it normally

A. input bias current

B. input offset current

C. input threshold current

D. input holding current

Answer: **Option A**

Solution:

15. Ideal op-amp requires no input current, but real op-amp needs a very small input current called input bias current. At both inputs, the bias currents have a slight difference. What do you call this difference?

A. differential input current

B. differential bias

C. input offset difference

D. input offset current

Answer: **Option D**

Solution:

16. The change in input offset current due to temperature change

A. delta input offset current

B. slew rate

C. input offset current drift

D. PSRR

Answer: **Option C**

Solution:

17. It is known through experiment that the input bias currents at the non-inverting (IB+) and inverting (IB-) inputs of a certain op-amp is 100 nA and 80 nA, respectively. Determine the op-amp’s input offset current.

A. -20 nA

B. 20 nA

C. 90 nA

D. 180 nA

Answer: **Option B**

Solution:

18. The reduction of op-amps gain due to increasing operating frequency.

A. Cutoff

B. roll-off

C. diminishing factor

D. reduction step

Answer: **Option B**

Solution:

19. A reduction of op-amp’s voltage gain by a factor of two each time the frequency doubles.

A. 2 dB/octave

B. 2 dB/decade

C. 6 dB/octave

D. 6 dB/decade

Answer: **Option C**

Solution:

20. Frequency at which the voltage gain of op-amp reduces to unity.

A. unity-gain frequency

B. cutoff frequency

C. bandwidth point

D. unity-gain bandwidth product

Answer: **Option D**

Solution:

21. The low and high cutoff frequencies of an amplifier is also called

A. corner frequencies

B. 0.707 frequencies

C. 3-dB frequencies

D. all of these are correct

Answer: **Option D**

Solution:

22. The maximum output voltage rate of change of an op-amp.

A. rise time

B. maximum voltage swing

C. differential rate

D. slew rate

Answer: **Option D**

Solution:

23. Two comparators using op-amps, configured such that it can detect voltage levels within a certain range of values rather than simply comparing whether a voltage is above or below a certain reference.

A. analog comparator

B. regenerative comparator

C. parallel comparator

D. window comparator

Answer: **Option D**

Solution:

24. The feedback element of a differentiator constructed from op-amp is

A. a resistor

B. an inductor

C. a capacitor

D. an RC network

Answer: **Option A**

Solution:

25. An active integrator uses an op-amp, what is its feedback element?

A. Resistor

B. capacitor

C. inductor

D. RC network

Answer: **Option B**

Solution:

26. The voltage gain of an op-amp voltage follower.

A. unity

B. Rf/Ri

C. 1 + Rf/Ri

D. depends on the type of op-amp

Answer: **Option A**

Solution:

27. Calculate the closed-loop voltage gain of an inverting amplifier having a feedback and an input resistance of 100 kΩ and 10 kΩ, respectively.

A. 10

B. 11

C. 100

D. 110

Answer: **Option A**

Solution:

28. A unity-gain summing amplifier has three inputs, V1 = 1.0 mV, V2 = 1.5 mV, and V3 = 2.5 mV, calculate the total output voltage.

A. 2.5 mV

B. 3.5 mV

C. 4.0 mV

D. 5.0 mV

Answer: **Option D**

Solution:

29. Which condition must exist for a circuit to oscillate?

A. It must have a negative feedback sufficient to cancel the input

B. It must have a gain of less than 1

C. It must have a positive feedback sufficient to overcome losses

D. It must be neutralized

Answer: **Option C**

Solution:

30. Circuits that produces alternating or pulsating current or voltage.

A. Damper

B. Generator

C. oscillator

D. mixer

Answer: **Option C**

Solution:

31. What do you call the oscillator circuit that uses a tapped coli in the tuned circuit?

A. Pierce

B. Colpitts

C. Hartley

D. Ultraudion

Answer: **Option C**

Solution:

32. What determines the resonant frequency of a crystal?

A. external components

B. the temperature of the crystal

C. the size and thickness of the crystal material

D. the hermitic seal

Answer: **Option C**

Solution:

33. A self-excited oscillator in which the tank is divided into input and feedback portions by a capacitive voltage divider.

A. Hartley capacitor

B. Colpitts oscillator

C. Relaxation oscillator

D. Klystron oscillator

Answer: **Option B**

Solution:

34. A self-excited oscillator in which the tank is divided into input and feedback portions by an inductive voltage divider or a tapped coil.

A. Hartley oscillator

B. Copitts oscillator

C. Relaxation oscillator

D. Klystron oscillator

Answer: **Option A**

Solution:

35. A circuit usually containing two transistors or tubes in an RC-coupled amplifier, the two active devices switch each other alternately on and off.

A. Multivibrator

B. Signal generator

C. Oscillator

D. Thyristor

Answer: **Option A**

Solution:

36. A multivibrator that generates one output pulse for each input trigger pulse.

A. monostable

B. astable

C. bistable

D. tristate

Answer: **Option A**

Solution:

37. Monostable multivibrator is also known as

A. one shot

B. single shot

C. direct shot

D. one shot or single shot

Answer: **Option D**

Solution:

38. What determines the pulse time in a monostable multivibrator?

A. resistor combinations

B. capacitor combinations

C. inductor combinations

D. resistor and capacitor combinations

Answer: **Option D**

Solution:

39. A multivibrator having two stable state

A. monostable

B. bistable

C. astable

D. unstable

Answer: **Option B**

Solution:

40. Is also known as Eccles/Jordan circuit

A. Monostable multivibrator

B. bistable multivibrator

C. astable multivibrator

D. unstable multivibrator

Answer: **Option B**

Solution:

41. Flip-flop is actually a _______ multivibrator.

A. Monostable

B. bistable

C. astable

D. unstable

Answer: **Option B**

Solution:

42. Considered as a free-running multivibrator

A. monostable

B. bistable

C. astable

D. unstable

Answer: **Option C**

Solution:

43. Filter that is characterized by a relatively flat passband and slow roll-off rate

a. Butterworth

b. Elliptic

c. Chebyshev

d. Notch

Answer: **Option A**

Solution:

44. Filter that is characterized by ripple at the passband and fast roll-off rate

a. Butterworth

b. Elliptic

c. Chebyshev

d. Notch

Answer: **Option C**

Solution:

45. An LC circuit resonates at 2000 kHz and has a Q of 100. Find the lower and upper cut-off frequencies.

a. 1980 kHz, 2020 kHz

b. 1950 kHz, 2050 kHz

c. 1990 kHz, 2010 kHz

d. 1900 kHz, 2100 kHz

Answer: **Option C**

Solution:

46. What is the resonant frequency of a circuit when L is 1 microhenry and C is 10 picofarads are in series?

a. 50.3 MHz

b. 15.9 MHz

c. 15.9 kHz

d. 50.3 kHz

Answer: **Option A**

Solution:

47. What happens to the input resistance of an amplifier employing voltage-series feedback?

a. It is increased

b. It remains the same

c. It is decreased

d. Equals infinity

Answer: **Option A**

Solution:

48. What happens to the output resistance of an amplifier employing voltage-shunt feedback?

a. It is increased

b. It remains the same

c. It is decreased

d. Equals infinity

Answer: **Option C**

Solution:

49. If the gain of an amplifier without feedback is 10 and with negative feedback is 8, then the feedback fraction is

a. 0.025

b. 0.9

c. 0.8

d. 0.225

Answer: **Option A**

Solution:

50. _____ is the progressive decay with time in the amplitude of the free oscillation in a circuit.

a. Decrement

b. Pulse decay time

c. Damping

d. Dancing

Answer: **Option C**

Solution:

#### Questions and Answers in Electronic Circuits

Following is the list of practice exam test questions in this brand new series:

**MCQ in Electronic Circuits**

**MCQs from Number 1 – 50**Answer key:

**PART 1**

**MCQs from Number 51 – 100**Answer key:

**PART 2**

**MCQs from Number 101 – 150**Answer key:

**PART 3**

**MCQs from Number 151 – 200**Answer key:

**PART 4**

**MCQs from Number 201 – 250**Answer key:

**PART 5**

**MCQs from Number 251 – 300**Answer key:

**included**

**MCQs from Number 301 – 350**Answer key:

**included**

**MCQs from Number 351 – 400**Answer key:

**included**

**MCQs from Number 401 – 450**Answer key:

**included**

**MCQs from Number 451 – 500**Answer key:

**included**

### Complete List of MCQ in Electronics Engineering per topic

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