1. Transistors were used in

  1. First-generation computing devices
  2. Second-generation computing devices
  3. Third-generation computing devices
  4. Fourth-generation computing devices
Answer. b

2. For normal operation of a transistor, the collector-base junction is

  1. Always reverse biased
  2. Always forward biased
  3. Is grounded
  4. Unbiased
Answer. a

3. Which of the statements given below is/are correct?

  1. BJT is a current controlled device with high input impedance and high gain bandwidth
  2. UJT is a positive resistance device and used as an oscillator
  3. FET is a voltage-controlled device with high input impedance and low gain bandwidth.
  4. BJT, FET, UJT can all be used for amplification
  1. 1 and 2
  2. 1 and 3
  3. 2 and 4
  4. only 3
Answer. d

4. If two identical transistors each having a current gain of 50 is connected in Darlington connection, the current gain of the connection will be

  1. 625
  2. 2250
  3. 500
  4. 2500
Answer. d

5. BJT has _________ input impedance and _________ output impedance.

  1. Low, low
  2. Low, high
  3. High, low
  4. High, high
Answer. b

6. Conventional flow of current in a P-N-P transistor is from

  1. Emitter to base
  2. Base to emitter
  3. Base to collector
  4. Emitter to collector
Answer. a

7. In a BJT, collector region width is maximum when it

  1. collects the maximum number of charge carrier
  2. reduces heat dissipation per unit area

Out of these

  1. Only 1 is correct
  2. Only 2 is correct
  3. Both 1 and 2 are correct
  4. Neither 1 nor 2 incorrect
Answer. c

8. In the active region of a transistor, collector-base junction is _________ biased.

  1. Forward, forward
  2. Reverse, reverse
  3. Reverse, forward
  4. Forward, reverse
Answer. c

9. The purpose of gold doping is for

  1. Collector region of a BJT to used as a switch
  2. Increasing collector current to use as a power amplifier
  3. Reducing the lifetime of charge carriers
  4. Collector region of a BJT to use as a switch and reducing the lifetime of charge carriers
Answer. d

10. In a BJT, when both junctions are forward biased then the operating mode is called

  1. Reverse active mode
  2. Forward active mode
  3. Saturation mode
  4. Cut-off mode
Answer. c

11. Following methods are used to increase the input resistance of a common emitter state (BJT). Arrange these methods in descending order of effectiveness.

  1. Un-bypassing emitter resistance
  2. Bootstrapping
  3. Biasing it at low quiescent current
  4. Using compounded BJTs
  1. 2>4>1>3
  2. 4>3>2>1
  3. 2>4>3>1
  4. 4>2>3>1
Answer. b

12. Base-bias is associated with

  1. Amplifiers
  2. Switching circuits
  3. Stable Q-point
  4. Fixed emitter current
Answer. b

13. If a transistor operates at the middle of the load line, a decrease in the current gain will move the Q-point

  1. Down
  2. Up
  3. Nowhere
  4. Off the load line
Answer. a

14. The current gain of a transistor is defined as the ratio of the collector current to the

  1. Base current
  2. Emitter current
  3. Supply current
  4. Collector current
Answer. a

15. A transistor is said to be in a quiescent stage when

  1. Emitter junction bias is just equal to the collector
  2. No current is flowing
  3. No signal is applying to the input
  4. It is biased
Answer. c

16. In transistor configuration producing highest output resistance is

  1. CC
  2. CB
  3. CE
  4. None of these
Answer. b

17. Transistor is a

  1. Current control current device
  2. Current control voltage device
  3. Voltage control current device
  4. Voltage control voltage device
Answer. a

18. The emitter region in N-P-N junction transistor is more heavily doped than the base region so that

  1. The flow across the base region will be mainly due to electrons
  2. The flow across the base region will be mainly due to holes
  3. Base current will be high
  4. There will be increase recombination in the base region
Answer. a

19. β of a transistor can exceed

  1. 1
  2. 0.1
  3. 0.01
  4. 0
Answer. a

20. The α of a transistor should be

  1. 1
  2. 0.99
  3. 20
  4. 0.01
Answer. b