RRB JE electrical practice paper | RRB JE Electrical

RRB Previous Year Paper / March 15, 2022

Ques.61. By increasing the reverse voltage in a diode, the barrier capacitance

  1. Decreases
  2. Increase
  3. Remain constant
  4. None of these

Answer.1. Decreases

 

Ques.62. A half-wave rectifier has a ripple factor of

  1. 1.11
  2. 1.75
  3. 1.21
  4. None of these

Answer.3. 121

 

Ques.63. For higher voltage rating, the diode are connected in

  1. Series
  2. Parallel
  3. Some diodes in series and some in parallel
  4. None of these

Answer.1. Series

 

Ques.64. In 1 to 4 Demultiplexer, how many lines are required

  1. 2
  2. 3
  3. 4
  4. 5

Answer.1. 2

 

Ques.65. How many AND gates are required for a 1 to 8 multiplexer

  1. 2
  2. 6
  3. 4
  4. 5

Answer.3.4

 

Ques.66. Which IC is used for the implementation of 1 to 16 DEMUX

  1. IC 74154
  2. IC 74154
  3. IC 74139
  4. IC 74138

Answer.1. IC 74154

 

Ques.68. ADC conversion involves

  1. Quantization
  2. Simulation
  3. Summation
  4. Subtraction

Answer.1. Quantization

 

Ques.69. A system that converts a digital signal into analog signal is called

  1. ADC
  2. DAC
  3. AAC
  4. DDC

Answer.2. DAC

 

Ques.70. A step-up Chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  1. 0.32
  2. 0.67
  3. 0.45
  4. 0.27

Answer.2. 0.67

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