RRB JE electrical practice paper | RRB JE Electrical

Ques.11. The number of samples present in an impulse response is called as

  1. String
  2. Array
  3. Length
  4. Elements

Answer.3. Length

 

Ques.12. A change of 5% in supply voltage to an induction motor will produce a change of approximately

  1. 5% in the rotor torque
  2. 25% in the rotor torque
  3. 50% in the rotor torque
  4. 100% in the rotor torque

Answer.2. 100% in the rotor torque

 

Ques.13. Mass in the M.K.S units system is analogous to

  1. Resistance
  2. Voltage
  3. Capacitance
  4. Inductance

Answer.3. Capacitance

 

Ques.14. In a loss free RLC circuit the transient current is

  1. Sinusoidal
  2. Oscillating
  3. Non-Oscillating
  4. Square Wave

Answer.1. Sinusoidal

 

Ques.15. An inducatnce coil of 10 H develops the counter voltage of 50 V. What should be the rate of change of current in the coil?

  1. 5 A/sec
  2. 10 A/sec
  3. 1 A/sec
  4. 100 A/sec

Answer.1. 5A/sec

 

Ques.16. The peak value of the sinusoidal voltage is 10 Volts. What will be the effective value of voltages?

  1. 14.14 Volts
  2. 1.411 Volts
  3. 0.707 volts
  4. 7.07 Volts

Answer.4. 7.07 Volts

 

Ques.17. Shunt conductor in power transmission line is due to

  1. Leakage over insulator
  2. Leakage over the conductance
  3. Leakage over the poles
  4. Leakage between the ground and conductors

Answer.3. Leakage over the poles

 

Ques.18. The D.C generator is preferred if it has

  1. 100% regulation
  2. Small regulation
  3. 10% regulation
  4. Infinite

Answer.2. Small regulation

 

Ques.19. The amplidyne is

  1. Fully compensated cross field machine
  2. Half compensated cross field machine
  3. Overcompensated cross field machine
  4. Under compensated cross field machine

Answer.1. Fully compensated cross field machine

 

Ques.20. The resistance of armature winding of a motor at 0°C is 80 ohms. Find the resistance at 40°C if the temperature coefficient of copper at 0°C is 0.0043

  1. 97.75 ohm
  2. 95.20 ohm
  3. 93.76 ohm
  4. 96.65 ohm

Answer.3. 93.76 ohms

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