Basic Electronic Interview Questions and Answers

1. What is the meaning of an ideal voltage source ?

A device that has zero internal resistance

2. What is an ideal current source ?

A device that has an infinite internal resistance

3. What is meant by a practical voltage source ?

A device that includes less internal resistance

4. What is meant by a practical current source ?

A device that has a huge internal resistance

5. The voltage beyond an ideal voltage source is ?

Stable

6. The current beyond an ideal current source is ?

Constant

7. The connection between two points along with an electrical current is known as ?

A circuit

8. The current formula according to Ohms Law is ?

Current = Voltage / Resistance

9. The electrical resistance unit is ?

Ohm

10. In a DC circuit, if the voltage is constant and the resistance increases, then the current will be ?

Decrease

11. In a silicon atom, the number of valence electrons is ?

4

12. The semiconductor element that is most commonly used is ?

Silicon

13. Copper material is a ?

Conductor

14. In the nucleus of a-Si atom, the numbers of protons are ?

Ans: 14

15. In a conductor, the valence electron is known as ?

Free electron

16. At room temperature, an intrinsic semiconductor has ?

A few free electrons and holes

17. At room temperature, an intrinsic semiconductor includes some holes in it because of ?

Thermal energy

18. In an intrinsic semiconductor, the number of holes is ?

Equivalent to the no. of free electrons

19. Holes functions like a ?

Positive charges

20. What is the odd one in four of these namely conductor, semiconductor, four valence electrons, and crystal structure?

Conductor

21. What should we need to add for producing P-type semiconductors?

Trivalent impurity

22. In n-type semiconductors, electrons are ?

The minority charge carriers

23. A p-type semiconductor includes ?

Holes & Negative Ions

24. The electrons in a pentavalent atom are ?

5

25. Negative ions are ?

Atoms that obtained an electron

26. The reason for the depletion layer is ?

Recombination

27. In a diode, the reverse current is usually ?

Very less

28. In Diode, Avalanche occurs at ?

Breakdown voltage

29. The potential barrier of a silicon diode is ?

0.7 V

30. In a Silicon Diode, the reverse saturation current as compared with a Germanium Diode is ?

Less

31. A Diode is a ?

Linear Device

32. In which biasing condition, the current in the diode is large ?

Forward Bias

33. The bridge rectifier’s o/p voltage signal is ?

Full-wave

34. In Bridge Rectifier, if the maximum DC current rating of diodes is 1A, then what will be the highest DC load current ?

2A

35. Voltage multipliers generate ?

High voltage & low current

36. What is a Clipper ?

A circuit that removes a part of a waveform so that it doesn’t exceed a certain voltage level.

37. What is a Clamper ?

A circuit that adds a DC voltage (positive or negative) to a wave.

38. Zener diode can be defined as ?

A diode with a stable voltage is known as Zener Diode.

39. If the Zener Diode is connected in the wrong polarity, the voltage across the load is ?

0.7 V

40. In a transistor, the number of PN Junctions are ?

Two

41. In the NPN Transistor, the doping concentration is ?

Lightly Doped

42. In the NPN Transistor, the Base-Emitter Diode is ?

Forward Biased

43. The size comparison between Base, Emitter, and Collector is ?

Collector > Emitter > Base

44. The Base to Collector Diode  is usually ?

Reverse Biased

45. In a transistor, the DC Current Gain is ?

The ratio of Collector Current & Base Current

46. If the base current is 100µA, the current gain is 100, then what will be the collector current is ?. In a transistor, the DC Current Gain is ?

10mA

47. The majority charge carriers within NPN and PNP Transistors are ?

Electrons & Holes

48. A Transistorworks like a?

Diode and Current Source

49. The relation between Base Current, Emitter Current, and Collector Current is ?

IE = IB + IC

50. The whole power dissipated through a transistor is a product of collector current and ?

Collector-Emitter Voltage

51. In a CE (Common Emitter) Configuration, the i/p impedance is ?

Low

52. In a CE (Common Emitter) Configuration, the o/p impedance is ?

High

53. In Common Base (CB) configuration, the current gain (α) is ?

The ratio of Collector Current to Emitter Current (IC/IE)

54. The relation between α & ß is ?. In Common Base (CB) configuration, the current gain (α) is ?

α = ß / (ß + 1) & ß = α / (1 – α)

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