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# MCQ in Electronic Circuits Part 1 | ECE Board Exam

This is the Multiple Choice Questions in Electronic Circuits (Electronic Devices and Circuits, Electronic Circuit Analysis and Design) Part 1 of the Series as one of the Electronics Engineering Examination 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

4. Electronic Devices and Circuits

• MCQ in Diode Wave Shaping Circuits and Special Diode Applications
• MCQ in BJT and FET Small Signal Analysis
• MCQ in Diode Equivalent Circuits
• MCQ in Voltage Multipliers, Power Supply, and Voltage Regulation
• MCQ in Bipolar Junction Transistor and FET

5. Electronic Circuit Analysis and Design

• MCQ in BJT and FET Frequency Response
• MCQ in Cascade and Cascode Connections
• MCQ in Current Mirrors and Current Source
• MCQ in Differential and Operational Amplifier
• MCQ in Feedback Systems, Oscillators, and Filters

#### Start Practice Exam Test Questions Part 1 of the Series

Choose the letter of the best answer in each questions.

1. Which of the following amplifier is considered linear?

A. Class A

B. Class B

C. Class C

D. Either A or B

Solution:

2. The voltage gain of a common collector configuration is

A. Unity

B. Zero

C. Very high

D. Moderate

Solution:

3. A two-transistor class B power amplifier is commonly called

A. Push-pull amplifier

B. Dual amplifier

C. Symmetrical amplifier

D. Differential amplifier

Solution:

4. If a transistor is operated in such a way that output current flows for 160 degrees of the input signal, then it is ____________ operation.

A. Class A

B. Class C

C. Class B

D. Class AB

Solution:

5. Which coupling has the best frequency response?

A. Direct

B. RC

C. Transformer

D. Transistor

Solution:

6. A transistor amplifier has high output impedance because

A. Emitter is heavily doped

B. Collector is wider than emitter or base

C. Collector has reverse bias

D. Emitter has forward bias

Solution:

7. Which of the following is considered an amplifier figure of merit?

A. Gain-bandwidth product

B. Beta (ฮฒ)

C. Alpha (ฮฑ)

D. Temperature

Solution:

8. What piece of equipment in an oscilloscope is used to indicate pulse condition in a digital logic circuit?

A. Probe

B. Test prods

C. Connector

D. Logic probe

Solution:

9. What linear circuit compares two input signals and provides a digital level output depending on the relationship of the input signals?

A. Comaparator

B. Controller

C. Compressor

D. Switch

Solution:

10. What type of coupling is generally used in power amplifiers?

A. Transformer

B. Direct

C. RC

D. Inductive

Solution:

11. Which amplifier whose output current flows for the entire cycle?

A. Class A

B. Class B

C. Class C

D. Class AB

Solution:

12. The coupling capacitor Cc must be large enough to ___________ in an RC coupling scheme.

A. Pass dc between the stages

B. Dissipate high power

C. Prevent attenuation of low frequency

D. Prevent attenuation of high frequency

Solution:

13. What is the point of intersection of dc and ac load lines called?

A. Operating point

B. Cut off point

C. Saturation point

D. Breakdown

Solution:

14. An oscillator produces ____________ oscillations.

A. Damped

B. Modulated

C. Undamped

D. Sinusoidal

Solution:

15. What is the operating point in the characteristic curve called?

A. Quiescent point

C. Biasing point

D. Saturation point

Solution:

16. Oscillators operate on the principle of

A. Positive feedback

B. Negative feedback

C. Signal feedthrough

D. Attenuation

Solution:

17. In a class A amplifier, the output signal is

A. Distorted

B. The same as the input

C. Clipped

D. Smaller in amplitude than the input

Solution:

18. What happens if the input capacitor of a transistor amplifier is short-circuited?

A. Biasing conditions will change

B. Transistor will be destroyed

C. Signal will not reach the base

D. Biasing will stabilize

Solution:

19. Which is used to establish a fixed level of current or voltage in a transistor?

A. Biasing

D. Coupling

Solution:

20. Which power amplifier has the highest collector efficiency?

A. Class A

B. Class C

C. Class B

D. Class AB

Solution:

21. What is a non-linear type of amplifier?

A. Class C

B. Class AB

C. Class B

D. Class A

Solution:

22. An AF transformer is shielded to

A. Keep the amplifier cool

B. Prevent the induction due to stray magnetic fields

C. Protect from rusting

D. Prevent electric shock

Solution:

23. Amplitude distortion is otherwise known as ___________ distortion.

A. Intermodulation

B. Harmonic

C. Phase

D. Resonant

Solution:

24. What represents common-emitter small signal input resistance?

A. hie

B. hfe

C. hib

D. hoe

Solution:

25. The ear is not sensitive to ____________ distortion.

A. Frequency

B. Amplitude

C. Harmonic

D. Phase

Solution:

26. Class C is an amplifier whose output current flows for

A. Less than one-half the entire input cycle

B. The entire input cycle

C. Twice the entire input cycle

D. Greater than one-half the entire input cycle

Solution:

27. If gain without feedback and feedback factor are A and ฮฒ respectively, then gain with negative feedback is given by

A. A/ 1-A ฮฒ

B. A/ 1+ A ฮฒ

C. 1+A ฮฒ / A

D. (1+A ฮฒ) A

Solution:

28. The collector current in an common base configuration is equal to

A. Alpha times emitter current plus leakage current

B. Alpha times base current plus leakage current

C. Beta times emitter current plus leakage current

D. Beta times collector current plus leakage current

Solution:

29. Which is not a basic BJT amplifier configuration?

A. Common-drain

B. Common-base

C. Common-emitter

D. Common-collector

Solution:

30. The value of collector load resistance in a transistor amplifier is ___________ the output impedance of the transistor.

A. Equal to

B. More than

C. Less than

D. Not related

Solution:

31. What is the purpose of RC or transformer coupling?

A. To block ac

B. To separate bias of one stage from another

C. To increase thermal stability

D. To block dc

Solution:

32. The bandwidth of a single stage amplifier is ___________ that of multistage amplifier.

A. Equal to

B. Less than

C. More than

D. Independent

Solution:

33. What is the time taken by the electrons or holes to pass from the emitter to the collector?

A. Transit time

B. Recombination

C. Transient time

D. Duty cycle

Solution:

34. To obtain good gain stability in a negative feedback amplifier, AB is

A. Equal to 1

B. Very much greater than 1

C. Less than 1

D. Zero

Solution:

35. The basic concept of the electric wave filter was originated by

A. Campbell and Wagner

B. Norton

C. Foster

D. Bode and Darlington

Solution:

36. Which configuration has the lowest current gain?

A. Common-base

B. Common-collector

C. Common-emitter

D. Emitter follower

Solution:

37. Which transistor configuration offers no phase reversal at the output?

A. Common-base

B. Common-collector

C. Common-emitter

D. Both A and B

Solution:

38. The number of stages that can be directly coupled is limited because

A. Change in temperature can cause thermal instability

B. Circuit becomes heavily and costly

C. It becomes difficult to bias the circuit

D. Circuitsโ resistance becomes too large

Solution:

39. The input capacitor in an amplifier is called _____________ capacitor.

A. Coupling

B. Stray

C. Bypass

D. Electrolytic

Solution:

40. AC load line has a/an _____________ slope compared to that of dc load line.

A. Zero

B. Smaller

C. Bigger

D. Infinite

Solution:

41. A multistage amplifier uses at least how many transistors?

A. One

B. Three

C. Four

D. Two

Solution:

42. RC coupling is used for _____________ amplification.

A. Voltage

B. Current

C. Signal

D. Power

Solution:

43. An ammeterโs ideal resistance should be

A. Zero

B. Unity

C. Infinite

D. The same with the circuits resistance

Solution:

44. What circuit increases the peak โto-peak voltage, current or power of a signal?

A. Power supply

B. Attenuator

C. Amplifier

D. Filter

Solution:

45. When the non-linear distortion in an amplifier is D without feedback, with negative voltage feedback it will be

A. D/ 1+ A ฮฒ

B. 1+ A ฮฒ / D

C. D (1+A ฮฒ)

D. D (1-A ฮฒ)

Solution:

46. A tuned amplifier uses what load?

A. Resistive

B. Capacitive

C. LC tank

D. Inductive

Solution:

47. The voltage gain over mid- frequency range in an RC coupled amplifier

A. Changes instantly with frequency

B. Is constant

C. Is independent of the coupling

D. Is maximum

Solution:

48. The input impedance of an amplifier _____________ when negative voltage feedback is applied.

A. Decreases

B. Becomes zero

C. Increases

D. Is unchanged

Solution:

49. The input impedance of an amplifier ___________ when negative current feedback is applied.

A. Remains unchanged

B. Decreases

C. Increases

D. Becomes zero

Solution:

50. To obtain the frequency response curve of an amplifier ___________ is kept constant.

A. Generator output level

B. Amplifier output

C. Generator frequency

D. Amplifier frequency

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
PART 1: MCQ from Number 1 โ 50                        Answer key: PART 1
PART 2: MCQ from Number 51 โ 100                   Answer key: PART 2
PART 3: MCQ from Number 101 โ 150                 Answer key: PART 3
PART 4: MCQ from Number 151 โ 200                 Answer key: PART 4
PART 5: MCQ from Number 201 โ 250                 Answer key: PART 5
PART 6: MCQ from Number 251 โ 300                 Answer key: included
PART 7: MCQ from Number 301 โ 350                 Answer key: included
PART 8: MCQ from Number 351 โ 400                 Answer key: included
PART 9: MCQ from Number 401 โ 450                 Answer key: included
PART 10: MCQ from Number 451 โ 500                 Answer key: included

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

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