Multiple Choice Questions Topic Outline
- MCQs in Amplifiers
- MCQs in Oscillators
- MCQs in Rectifier
- MCQs in Filters
- MCQs in Voltage Regulation
The Series
Following is the list of multiple choice questions in this brand new series:
Start Practice Exam Test Questions Part 1 of the Series
1. Which of the following amplifier is considered linear?
- A. Class A
- B. Class B
- C. Class C
- D. Either A or B
2. The voltage gain of a common collector configuration is
- A. Unity
- B. Zero
- C. Very high
- D. Moderate
3. A two-transistor class B power amplifier is commonly called
- A. Push-pull amplifier
- B. Dual amplifier
- C. Symmetrical amplifier
- D. Differential amplifier
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
5. Which coupling has the best frequency response?
- A. Direct
- B. RC
- C. Transformer
- D. Transistor
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
7. Which of the following is considered an amplifier figure of merit?
- A. Gain-bandwidth product
- B. Beta (β)
- C. Alpha (α)
- D. Temperature
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
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
10. What type of coupling is generally used in power amplifiers?
- A. Transformer
- B. Direct
- C. RC
- D. Inductive
11. Which amplifier whose output current flows for the entire cycle?
- A. Class A
- B. Class B
- C. Class C
- D. Class AB
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
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
14. An oscillator produces _________ oscillations.
- A. Damped
- B. Modulated
- C. Undamped
- D. Sinusoidal
15. What is the operating point in the characteristic curve called?
- A. Quiescent point
- B. Load point
- C. Biasing point
- D. Saturation point
16. Oscillators operate on the principle of
- A. Positive feedback
- B. Negative feedback
- C. Signal feedthrough
- D. Attenuation
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
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
19. Which is used to establish a fixed level of current or voltage in a transistor?
- A. Biasing
- B. Loading
- C. Load line
- D. Coupling
20. Which power amplifier has the highest collector efficiency?
- A. Class A
- B. Class C
- C. Class B
- D. Class AB
21. What is a non-linear type of amplifier?
- A. Class C
- B. Class AB
- C. Class B
- D. Class A
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
23. Amplitude distortion is otherwise known as _________ distortion.
- A. Intermodulation
- B. Harmonic
- C. Phase
- D. Resonant
24. What represents common-emitter small signal input resistance?
- A. hie
- B. hfe
- C. hib
- D. hoe
25. The ear is not sensitive to ________ distortion.
- A. Frequency
- B. Amplitude
- C. Harmonic
- D. Phase
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
27. If gain without feedback and feedback factor are A and β respectively, then gain with negative feedback is given by
- A. A/ 1-A β
- B. A/ 1+ A β
- C. 1+A β / A
- D. (1+A β) A
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
29. Which is not a basic BJT amplifier configuration?
- A. Common-drain
- B. Common-base
- C. Common-emitter
- D. Common-collector
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
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
32. The bandwidth of a single stage amplifier is ________ that of multistage amplifier.
- A. Equal to
- B. Less than
- C. More than
- D. Independent
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
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
35. The basic concept of the electric wave filter was originated by
- A. Campbell and Wagner
- B. Norton
- C. Foster
- D. Bode and Darlington
36. Which configuration has the lowest current gain?
- A. Common-base
- B. Common-collector
- C. Common-emitter
- D. Emitter follower
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
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. Circuits’ resistance becomes too large
39. The input capacitor in an amplifier is called __________ capacitor.
- A. Coupling
- B. Stray
- C. Bypass
- D. Electrolytic
40. AC load line has a/an _________ slope compared to that of dc load line.
- A. Zero
- B. Smaller
- C. Bigger
- D. Infinite
41. A multistage amplifier uses at least how many transistors?
- A. One
- B. Three
- C. Four
- D. Two
42. RC coupling is used for ________ amplification.
- A. Voltage
- B. Current
- C. Signal
- D. Power
43. An ammeter’s ideal resistance should be
- A. Zero
- B. Unity
- C. Infinite
- D. The same with the circuits resistance
44. What circuit increases the peak –to-peak voltage, current or power of a signal?
- A. Power supply
- B. Attenuator
- C. Amplifier
- D. Filter
45. When the non-linear distortion in an amplifier is D without feedback, with negative voltage feedback it will be
- A. D/ 1+ A β
- B. 1+ A β / D
- C. D (1+A β)
- D. D (1-A β)
46. A tuned amplifier uses what load?
- A. Resistive
- B. Capacitive
- C. LC tank
- D. Inductive
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
48. The input impedance of an amplifier _______ when negative voltage feedback is applied.
- A. Decreases
- B. Becomes zero
- C. Increases
- D. Is unchanged
49. The input impedance of an amplifier _______ when negative current feedback is applied.
- A. Remains unchanged
- B. Decreases
- C. Increases
- D. Becomes zero
50. To obtain the frequency response curve of an amplifier ________ is kept constant.
- A. Generator output level
- B. Amplifier output
- C. Generator frequency
- Amplifier frequency
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