ANALOG ELECTRONICS 1 EE AND ECE IMPORTANT MCQ PDF- FOR VIZAG MT EXAM 2017

ANALOG ELECTRONICS 1

ANS-BOLD OPTION

1. Which of the following amplifier is considered linear?

• Class A
• Class B
• Class C
• Either A or B

2. The voltage gain of a common collector configuration is

• Unity
• Zero
• Very high
• Moderate

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

• Push-pull amplifier
• Dual amplifier
• Symmetrical amplifier
• 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.

• Class A
• Class C
• Class B
• Class AB

ANALOG ELECTRONICS 1

5. Which coupling has the best frequency response?

• Direct
• RC
• Transformer
• Transistor

6. A transistor amplifier has high output impedance because

• Emitter is heavily doped
• Collector is wider than emitter or base
• Collector has reverse bias
• Emitter has forward bias

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

• Gain-bandwidth product
• Beta (β)
• Alpha (α)
• Temperature

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

• Probe
• Test prods
• Connector
• Logic probe

ANALOG ELECTRONICS 1

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

• Comaparator
• Controller
• Compressor
• Switch

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

• Transformer
• Direct
• RC
• Inductive

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

• Class A
• Class B
• Class C
• Class AB

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

• Pass dc between the stages
• Dissipate high power
• Prevent attenuation of low frequency
• Prevent attenuation of high frequency

ANALOG ELECTRONICS 1

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

• Operating point
• Cut off point
• Saturation point
• Breakdown

14. An oscillator produces _________ oscillations.

• Damped
• Modulated
• Undamped
• Sinusoidal

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

• Quiescent point
• Load point
• Biasing point
• Saturation point

16. Oscillators operate on the principle of

• Positive feedback
• Negative feedback
• Signal feedthrough
• Attenuation

ANALOG ELECTRONICS 1

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

• Distorted
• The same as the input
• Clipped
• Smaller in amplitude than the input

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

• Biasing conditions will change
• Transistor will be destroyed
• Signal will not reach the base
• Biasing will stabilize

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

• Biasing
• Loading
• Load line
• Coupling

20. Which power amplifier has the highest collector efficiency?

• Class A
• Class C
• Class B
• Class AB

ANALOG ELECTRONICS 1

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

• Class C
• Class AB
• Class B
• Class A

22. An AF transformer is shielded to

• Keep the amplifier cool
• Prevent the induction due to stray magnetic fields
• Protect from rusting
• Prevent electric shock

23. Amplitude distortion is otherwise known as _________ distortion.

• Intermodulation
• Harmonic
• Phase
• Resonant

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

• hie
• hfe
• hib
• hoe

25. The ear is not sensitive to ________ distortion.

• Frequency
• Amplitude
• Harmonic
• Phase

ANALOG ELECTRONICS 1

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

• Less than one-half the entire input cycle
• The entire input cycle
• Twice the entire input cycle
• 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/ 1-A β
• A/ 1+ A β
• 1+A β / A
• (1+A β) A

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

• Alpha times emitter current plus leakage current
• Alpha times base current plus leakage current
• Beta times emitter current plus leakage current
• Beta times collector current plus leakage current

29. Which is not a basic BJT amplifier configuration?

• Common-drain
• Common-base
• Common-emitter
• Common-collector

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

• Equal to
• More than
• Less than
• Not related

ANALOG ELECTRONICS 1

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

• To block ac
• To separate bias of one stage from another
• To increase thermal stability
• To block dc

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

• Equal to
• Less than
• More than
• Independent

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

• Transit time
• Recombination
• Transient time
• Duty cycle

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

• Equal to 1
• Very much greater than 1
• Less than 1
• Zero

ANALOG ELECTRONICS 1

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

• Campbell and Wagner
• Norton
• Foster
• Bode and Darlington

36. Which configuration has the lowest current gain?

• Common-base
• Common-collector
• Common-emitter
• Emitter follower

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

• Common-base
• Common-collector
• Common-emitter
• Both A and B

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

• Change in temperature can cause thermal instability
• Circuit becomes heavily and costly
• It becomes difficult to bias the circuit
• Circuits’ resistance becomes too large

ANALOG ELECTRONICS 1

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

• Coupling
• Stray
• Bypass
• Electrolytic

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

• Zero B. Smaller
• Smaller
• Bigger
• Infinite

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

• One
• Three
• Four
• Two

42. RC coupling is used for ________ amplification.

• Voltage
• Current
• Signal
• Power

43. An ammeter’s ideal resistance should be

• Zero
• Unity
• Infinite
• The same with the circuits resistance

ANALOG ELECTRONICS 1

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

• Power supply
• Attenuator
• Amplifier
• Filter

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

• D/ 1+ A β
• 1+ A β / D
• D (1+A β)
• D (1-A β)

46. A tuned amplifier uses what load?

• Resistive
• Capacitive
• LC tank
• Inductive

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

• Changes instantly with frequency
• Is constant
• Is independent of the coupling
• Is maximum

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

• Decreases
• Becomes zero
• Increases
• Is unchanged

ANALOG ELECTRONICS 1

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

• Remains unchanged
• Decreases
• Increases
• Becomes zero

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

• Generator output level
• Amplifier output
• Generator frequency
• Amplifier frequency