RRB JE electrical practice paper-2 | RRB JE Electrical

RRB Previous Year Paper / March 15, 2022

Ques.41. Which of the following capacitor is polarized?

  1. Mica
  2. Ceramic
  3. Plastic film
  4. Electrolytic

Answer.4. Electrolytic

 

Ques.42. The torque produced in a watt meter is proportional to

  1. The average value of currents in the two coils
  2. The RMS value of currents in the two coils
  3. The average value of the supply voltage
  4. None of these

Answer.1. The average value of currents in the two coils

 

Ques.43. A digital voltmeter has a readout range from 0 to 999 counts. If the full-scale reading is 9.99 V, the resolution is

  1. 1 V
  2. 0.01 V
  3. 1 mV
  4. 1 µV

Answer.3. 1mV

 

Ques.44. Consider the following statements. In a differential amplifier using JFET, the differential output offset is due to

  1. The mismatch between FET parameter
  2. The difference in values of resistance used in the circuit
  3. Variation in the supply voltage of the statements, the correct statements are
  4. Both 1 and 2

Answer.4. Both 1 and 2

 

Ques.45. Kelvin’s double bridge is used to measure low resistance because

  1. It has high sensitivity
  2. There is no thermoelectric EMF
  3. Resistance variation due to temperature
  4. Effects of contact and lead resistance are eliminated

Answer.4. Effects of contact and lead resistance are eliminated

 

Ques.46. Double integration of a unit step function would lead to

  1. An impulse
  2. A parabola
  3. A ramp
  4. A doublet

Answer.2. A parabola

 

Ques.47. An incremental model of a solid state device is one which represents the

  1. AC property of the device at the desired operating point
  2. DC property of the device at all operating points
  3. Complete AC and DC behavior at all operating points
  4. AC property of the device at all operating points

Answer.1. AC property of the device at the desired operating point

 

Ques.48. In a low power factor watt meter compensating coil is connected

  1. In series with current coil
  2. In parallel with the current coil
  3. In series with pressure coil
  4. In parallel with pressure coil

Answer.3. In series with pressure coil

 

Ques.49. The value of flux involved in the EMF equation of transformer is

  1. Instantaneous
  2. Maximum
  3. Average
  4. RMS

Answer.2. Maximum

 

Ques.50. The generator which given DC supply to the Rotor is called

  1. Converter
  2. Exciter
  3. Rectifier
  4. Invertor

Answer.4. Invertor

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