About Analog Electronics

Following are some of the multiple choice questions on the Analog Electronics with answers that will help the students in developing their knowledge.

Analog Electronics MCQ

1. Which of the following statements is false?

  • Push pull signals are equal and opposite in phase
  • Class AB operation cannot be used for a push pull audio power output phase
  • A push pull output transformer has a centre-tapped primary
  • All of the above

2. Negative feedback in an amplifier

  • Reduces gain
  • Increase frequency &phase distortion
  • Reduces bandwidth
  • Increases noise

3. A hole in a semiconductor is defined as

  • a free electron
  • the incomplete part of an electron pair bond
  • a free proton
  • a free neutron

4. MOSFET can be used as

  • Current controlled capacitor
  • voltage controlled capacitor
  • current controlled indicator
  • voltage controlled indicators

5. MOSFET can be used as a

  • Current controlled capacitor
  • Voltage controlled capacitor
  • Current controlled inductor
  • Voltage controlled inductors

6. What is an energy gap?

  • Space between two orbital shells
  • Energy band in which electrons can move freely
  • Energy level at which an electron can exist
  • None of the above

7. Anode is

  • Positive
  • Negetive
  • Chargeless
  • Neutral

8. The current gain of a bipolar transistor drops at high frequencies because of

  • Transistor capacitances
  • High current effects in the base
  • Parasitic inductive elements
  • The early effect

9. Which of the following oscillators is suitable for frequencies in the range of mega hertz?

  • RC phase shift
  • Wien bridge
  • Hartley
  • Both (a) and (c)

10. Thermal runaway is not possible in FET because as the temperature of FET increases

  • The mobility decreases
  • The transconductance increases
  • The drain current increases
  • None of the above

11. In a transistor leakage current mainly depends on

  • Doping of base
  • Size of emitter
  • Rating of transistor
  • Temperature

12. The early effect in a bipolar junction transistor is caused by

  • Fast turn-on
  • Fast turn-off
  • Large collector-base reverse bias
  • Large emitter-base forward bias

13. What will happen if doping of an intrinsic semiconductor with pentavalent impurity atom ?

  • Fermi level not change
  • Fermi level fall
  • Fermi level raises
  • All of the above

14. The current gain of a BJT is

  • gm r0
  • gm / r0
  • gm rπ
  • gm /rπ

15. In a CB amplifier the maximum efficiency could be

  • 99%
  • 85%
  • 50%
  • 25%

16. A change in the value of the emitter resistance Re in a differential amplifier

  • Affects the difference mode gain Ad
  • Affects the common mode gain Ac
  • Affects both Ad and Ac
  • Does not effect either Ad and Ac

17. In a CE amplifier the input impedance is equal to the ratio of

  • ac base voltage to ac base current
  • ac base voltage to ac emitter current
  • ac emitter voltage to ac collector current
  • ac collector voltage to ac collector current

18. Which power amplifier can deliver maximum load power?

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

19. An RC oscillator uses

  • one RC combination
  • two RC combinations
  • at least three RC combinations
  • either (a) or (b)

20. The bandwidth of an RF tuned amplifier is dependent on

  • Q –factor of the tuned o/p circuit
  • Q –factor of the tuned i/p circuit
  • Quiescent operating point
  • Q-factor of the o/p and i/p circuits as well as quiescent operating point

21. To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use

  • surge resistor
  • surge inductor
  • surge capacitor
  • both (a) and (b)

22. For high frequencies a capacitor like

  • an open circuit
  • a short circuit
  • either open circuit or short circuit
  • none of the above

23. Which of the following power amplifiers has highest efficiency?

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

24. How is BJT used as a faster switch?

  • By operating it in the saturation and cut-off region
  • By operating it in the active and cut-off region
  • By using it in strong saturation
  • By decreasing its ON resistance

25. The input voltage for starting oscillations in an oscillator is caused by

  • negative feedback
  • positive feedback
  • noise voltage in resistors
  • a special generator

26. In a half wave diode rectifier circuit the current flows in the load circuit for

  • 90° in each cycle
  • 180° in each cycle
  • 270° in each cycle
  • 360° in each cycle

27. In a push pull circuit

  • each transistor conducts for 180°
  • each transistor conducts for more than 180° but less than 360°
  • each transistor conducts for less than 180°
  • the period of conduction of each transistor depends on circuit configuration

28. The encapsulation of transistor is necessary for

  • Preventing radio interference
  • Preventing photo-emission effects
  • Avoiding loss of free electrons
  • Mechanical ruggedness

29. Which of the following comparator is having a positive feedback network?

  • Zero crossing detector
  • Reference comparator
  • Schmitt Trigger
  • None of the above

30. The dissipation at the collector is in the quiescent state and increases with excitation in the case of a

  • class A series fed Amplifier
  • class A transistor coupled Amplifier
  • class AB amplifier
  • class B amplifier

31. Potential barrier of Ge diode is?

  • 0.3 v
  • 0.7 v
  • 0.4 v
  • 0.8 v

32. In an amplifier the voltage gain is the ratio of

  • output voltage and emitter resistance
  • output voltage and input current
  • output voltage and input voltage
  • none of the above

33. Barrier potential of si diode is?

  • 0.3 v
  • 0.7 v
  • 0.4 v
  • 0.5 v

34. N type material are formed by adding with?

  • Trivalent
  • Tetravalent
  • Pentavalent
  • Hexavalent

35. P type material are formed by adding with?

  • Tetra valent
  • Tri valent
  • Penta valent
  • Hexa valent

36. The value of parameter re used in re transistor model

  • increases with increase in temperature
  • decreases with increase in temperature
  • is not affected by increase in temperature
  • either (b) or (c)

37. The action of JFET in its equivalent circuit can best be represented as a

  • Current controlled Current source
  • Current controlled voltage source
  • Voltage controlled voltage source
  • voltage controlled current source

38. N side of the diode is called?

  • Anode
  • Cathode
  • Both
  • None

39. P side of diode is called?

  • Cathode
  • Anode
  • None
  • Both

40. Which of the following statement about a common base transistor is true?

  • Very low input impedance
  • Very low output Impedance
  • Current gain is greater than unity
  • Voltage gain is very low

41. What is the phase difference between the output and input voltages of a CE amplifier?

  • 90 degree
  • 180 degree
  • 0 degree
  • 360 degree

42. Crystals in Oscillators are made using?

  • Gold
  • Quartz
  • Silver
  • Mercury

43. Which of these is your favorite?

  • Stars
  • Planets
  • Comets

44. What would you do in outer space?

45. Name any one of the two moons of Mars

  • Phobos
  • Deimos

46. Which of these celestial bodies are planets?

  • Venus
  • Neptune
  • Uranus
  • Pluto

47. Which of these is the largest planet in the Solar System?

  • Earth
  • Mars
  • Mercury
  • Jupiter
  • Pluto

48. Quartz crystal works on the principle of?

  • Piezo electric Effect
  • Piezo resistive Effect
  • Piezo capacitive Effect
  • Piezo inductive Effect

49. What does 'R' signify in the equivalent circuit of Crystal ?

  • Input impedence
  • Stiffness
  • Internal friction loss
  • Output resistance

50. What are the main components of an oscillator circuit?

  • transistor circuit, tank circuit, feedback circuit

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