Electronics mcqs, Engineering Mcqs

MCQs of Basic Electronics, 50 Questions

MCQs of Basic Electronics 50 Questions

Basic Electronics questions and answers with explanation for interview, competitive examination and entrance test.

For  ANS      1=A,      2=B,     3=C,       4=D

1. A resistor with colour bands: red-red-red-gold, has the value: 

  1. 22k 5%
  2. 2k2 5%
  3. 220R 5% 
  4. 22R 5%

ANS – B

2. A resistor and capacitor in series is called a:

  1. Pulse Circuit
  2. Timing Circuit/Delay Circuit
  3. Oscillator Circuit/Frequency Circuit
  4. Schmitt Circuit

ANS – B

3. Connecting a lead from the negative to the positive of a battery will produce:

  1. A high resistance circuit
  2. A short circuit
  3. A low current path
  4. An open circuit

ANS – B

4. What is the approximate characteristic voltage that develops across a red LED?

  1. 1.7v
  2. 3.4v
  3. 0.6v
  4. 5v

ANS – A

5. If two resistors are placed in series, is the final resistance:

  1. Higher
  2. Lower
  3. The same
  4. Cannot be determined

ANS – A

6. Which is not a "common" value of resistance?

  1. 2k7
  2. 1M8
  3. 330R
  4. 4k4

ANS – D

7. If a small value of capacitance is connected in parallel with a large value, the combined capacitance will be:

  1. The same
  2. Higher
  3. Lower

ANS – B

8. If the voltage on the base of a transistor increases, does it:

  1. Turn on
  2. Turn off
  3. Not enough information
  4. Remain the same

ANS – C

9. The resistor identified in brown is called the:
 

  1. Base Bias Resistor
  2. Load Resistor
  3. Emitter Feedback Resistor
  4. Bypass Resistor

ANS – B

10. A 100n capacitor in parallel with 10n produces:

  1. 90n
  2. 100n
  3. 110n
  4. Cannot be determined

ANS – C

 

11. What does LED stand for?

  1. Light Emitting Display
  2. Low Energy Display
  3. Light Emitting Diode
  4. Light Emitting Detector

 

ANS – C

12. The lead marked with the arrow is:

  1. The Collector
  2. The Base
  3. The Emitter
  4. The case

ANS – C

13. A 10k resistor in parallel with 10k produces:

  1. 10k
  2. 5k
  3. 20k
  4. Cannot be determined

ANS – B

14. The symbol is: 

  1. NPN Transistor
  2. PNP Transistor
  3. Photo Transistor
  4. Field Effect Transistor

ANS – B

15. Two 3v batteries are connected as shown. The output voltage is: 

  1. 3v
  2. 0v
  3. 6v

ANS – B

16. 4 resistors in ascending order are: 

  1. 22R 270k 2k2 1M
  2. 4k7 10k 47R 330k
  3. 3R3 4R7 22R 5k6
  4. 100R 10k 1M 3k3

ANS – C

17. The closest value for this combination is: 

  1. 4k7
  2. 2k3
  3. 9k4

     

ANS – B

18. This stage is called:

MCQs of Basic Electronics

  1. Common Base
  2. Common Collector
  3. Common Emitter
  4. Emitter Follower

ANS – C

19. The four symbols are: 

  1. Capacitor, Microphone, Potentiometer, Electrolytic
  2. Electrolytic, Microphone, Resistor, Capacitor 
  3. Capacitor, Piezo, Resistor, Electrolytic
  4. Electrolytic, Coil, Resistor, Capacitor

ANS – A

20. The value of the combination is: 

  1. 100n
  2. 200n
  3. 50n

ANS – B

21. The resistor marked in red is: 

  1. Base Bias Resistor
  2. Load Resistor
  3. Emitter Feedback Resistor
  4. Bypass Resistor

ANS – A

22. Name the three leads of a common transistor

  1. Collector Bias Omitter
  2. Base Collector Case
  3. Emitter Collector Bias
  4. Collector Base Emitter

ANS – D

23. A red-red-red-gold resistor in series with an orange-orange-orange-gold resistor produces:

  1. 5k5
  2. 35,200 ohms
  3. 55k
  4. None of the above

ANS – B

24. Name the 4 components: 

  1. Photo transistor, switch, capacitor, coil
  2. Transistor, mercury switch, piezo, coil 
  3. Photo transistor, reed switch, piezo, coil
  4. Photo darlington transistor, reed switch, piezo, coil

ANS – D

25. To obtain a higher value of resistance, resistors are connected in:

  1. Reverse
  2. Forward
  3. Parallel
  4. Series

ANS – D

26. A capacitor and coil in parallel is called:

  1. A Tuned Circuit
  2. A Timing Circuit
  3. A Delay Circuit
  4. A Schmitt Circuit

ANS – A

27. When the base is raised, the emitter will:

  1. Rise
  2. Fall
  3. Remain Fixed
  4. Oscillate

ANS – A

28. What is 1,000p?

  1. 0.01n
  2. 0.0001u
  3. 0.1n
  4. 1n

ANS – D

29. The current in a circuit is 45mA. This is:

  1. 0.045Amp
  2. 0.00045A
  3. 0.0045A
  4. 0.45A

ANS – A

30. A 100n capacitor can be expressed as:

  1. 0.1u u = microfarad
  2. 0.01u
  3. 0.001u
  4. none of the above

 

ANS – A

31. 1mA is equal to:

  1. 0.001A
  2. 0.00001A
  3. 0.01A
  4. 0.1A

ANS – A

32. 1,200mV is equal to:

  1. 12v
  2. 1.2v
  3. 0.12v
  4. 0.0012v

ANS – B

33. If a 10k resistor is placed across a 10v supply, the current will be:

  1. 10mA
  2. 1mA
  3. 0.01mA
  4. 0.1mA

ANS – B

34. For the XOR gate, what is the output when both inputs are HIGH:

  1. HIGH
  2. LOW
  3. Can be HIGH or LOW
  4. Cannot be determined

ANS – B

35. This arrangement is called:

  1. Common Emitter
  2. Common Collector/Emitter Follower
  3. Common Base

ANS – B

36. Identify the correctly connected LED:

  1. A
  2. B
  3. C
  4. D

ANS – B

37. Identify the correct statement:

  1. The cathode lead is longer. It goes to the negative rail
  2. The cathode lead is shorter. It goes to the negative rail
  3. The cathode lead is shorter. It goes to the positive rail
  4. The cathode lead is longer. It goes to the positive rail

ANS – B

38. The signal at the collector will be . . .

  1. Inverted . . . 
  2. In-phase . . .

. . . with the base.

ANS – A

39. The purpose of the capacitor:

  1. To pass AC on the input to the base
  2. To allow the transistor to self-bias
  3. Block DC from the input line
  4. To allow the stage to operate

ANS – C

40. The direction of conduction for a diode is:

  1. A
  2. B
  3. C

ANS – A

41. A DC voltage . . .

  1. rises and falls
  2. is a sinewave
  3. remains constant
  4. is an audio waveform

ANS – C

42. A CRO is a

  1. Cathode Ray Oscillator
  2. Cathode Ray Oscilloscope
  3. Capacitor-Resistor Oscillator
  4. Capacitor-Resistor Output

ANS – B

43. These jargon terms mean: (Jargon = language peculiar to a 'mickey' 'electro' 'cap' 'puff'; trade)

  1. mighty, electronic, capper, picofarad
  2. microfarad, electronic, capacitor, picofarad
  3. microfarad, electrolytic, capacitor, picofarad
  4. microfarad, electrolyte, capping, blow

ANS – C

44. The tolerance bands: gold; silver; brown, represent:

  1. 10%, 5%, 1%
  2. 5%, 10%, 2%
  3. 5%, 10%, 1%
  4. 10%, 5%, 2%

ANS – C

45. 223 on a capacitor represents:

  1. 0.022u u = microfarad
  2. 22n n = nanofarad
  3. 22,000p p = picofarad
  4. All of the above

ANS – B

46. Arrange these in ascending order: n, p, u 

  1. p, u, n, 
  2. n, u, p
  3. p, n, u

ANS – C

47. Name this symbol:

  1. A buffer
  2. A NOR gate
  3. A NAND gate
  4. A Schmitt Trigger

ANS – D

48. The number "104" on a capacitor indicates:

  1. 0.1u
  2. 100n
  3. 1n
  4. 10n

ANS – A & B (Both)

49. What is the Multimeter detecting?

  1. The output voltage of the Schmitt Trigger
  2. The delay across the capacitor
  3. The voltage across the capacitor
  4. The current through the capacitor

ANS – C

50. The current requirement of a LED is:

  1. 1.7mA
  2. 25mA
  3. Between 3 and 35mA
  4. 65mA

ANS – C


 

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