RRB JE electrical practice paper | RRB JE Electrical

RRB Previous Year Paper / March 15, 2022

Ques.51. The area of hysteresis loop of a material is 300 cm2. The scale of coordinated are: 1 cm = 0.4 Wb/m2, and 1 cm = 400 AT/m. Determine the hysteresis power loss it 1.2 × 10−3 m3 of the material is subjected to alternating flux density at 50 Hz.

  1. 268 watt
  2. 278 watt
  3. 288 watt
  4. 298 watt

Answer.3. 288 watt

 

Ques.52. Metals of high reactivity are separated from thier ores by

  1. Refining
  2. Roasting
  3. Electrolytic reduction
  4. None of these

Answer.3. Electrolytic reduction

 

Ques.53. D.C plate resistance of a vaccum tube is expressed as

  1. Vp × Ip
  2. Vp/Ip
  3. Ip/Vp
  4. None of these

Answer.2. Vp/Ip

 

Ques.54. Transistors are analogous to

  1. Relays
  2. Fuse
  3. Circuit breaker
  4. None of these

Answer.3. Circuit Breaker

 

Ques.55. The earth acts as dielectric at

  1. Any frequency
  2. Very high frequency
  3. Very low Frequency
  4. None of these

Answer.2. Very high frequency

 

Ques.56. The anode voltage for picture tubes should be of the order of

  1. 1000 V
  2. 5 kV
  3. 10 kV
  4. 12 kV

Answer.4. 12 kV

 

Ques.57. An atom is said to be electrically neutral when

  1. Number of electrons is equal to the number of protons
  2. Number of electrons is equal to the number of neutrons
  3. Number of electrons is less than protons
  4. None of these

Answer.2. Number of electrons is equal to the number of neutrons

 

Ques.58. The largest mass of an atoms is found in

  1. Protons
  2. Electrons
  3. Neutrons
  4. Nucleus

Answer.4. Nucleus

 

Ques.59. The amplifier which is used to operate a loudspeaker is

  1. Audio power amplifier
  2. Audio current amplifier
  3. Audio voltage amplifier
  4. None of these

Answer.1. Audio power amplifier

 

Ques.60. Trans conductance is measured in

  1. Ohm
  2. MHO
  3. Henry
  4. None of these

Answer.3. Henry

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