SSC JE electrical Mock Test Paper 2019| MES Electrical

Ques.91.For a single phase capacitor start induction motor, which of the following statements is valid?

    1. The direction of rotation can be changed by interchanging supply terminals.
  1. The direction of rotation cannot be changed.
  2. The direction of rotation can be changed by reversing main winding terminals.
  3. Single phase motor direction cannot be changed

Answer.2. The direction of rotation can be changed by reversing main winding terminals.

 

Ques.92. Load on a 3 phase synchronous motor running on full load unity power factor is reduced to half. Its field current is held constant. What will be the new power factor?

  1. Unity
  2. Leading
  3. Lagging
  4. None of the above

Answer.2. Leading

 

Ques.93. For a 400 V, 3 phase 3 wire star connected unbalanced load, the neutral point voltage can be

  1. 20 V
  2. 50 V
  3. 75 V
  4. 100 V

Answer.1. 20 V

 

Ques.94. If supply voltage terminals for a DC shunt motor are reversed, then:

  1. It will run in the opposite direction
  2. It will run in the same direction
  3. Motor will stop
  4. Motor gets burn

Answer.2. It will run in the same direction

 

Ques.95. If we observe the output waveform of DC generator on CRO, it will be like a

  1. Sinusoidal wave
  2. Square wave
  3. Constant voltage line
  4. Pulsating unidirectional waveform

Answer.4. Pulsating unidirectional waveform

 

Ques.96.Two coupled coils, each of self-inductance L = 0.2 H, have a coupling coefficient k = 0.9. The mutual inductance M is:

  1. 0.24 H
  2. 0.9 H
  3. 0.18 H
  4. 0.36 H

Answer.3. 0.18 H

 

Ques.97. A circuit whose behavior and characteristics is the same irrespective of the direction of current through the various elements is called:

  1. Unilateral
  2. Bilateral
  3. Lumped
  4. None of the above

Answer.2. Bilateral

 

Ques.98. Five cells are connected in series in a row and then four such rows are connected in parallel to feed the current to a resistive load of 1.25Ω. Each cell has emf of 1.5 V with an internal resistance of 0.2Ω. The current through load will be :

  1. 3.33 A
  2. 5 A
  3. 2A
  4. 1A

Answer.2. 5A

 

Ques.99. Surge Impedance Loading of a transmission line is also known as :

  1. No loading
  2. Characteristics impedance loading
  3. Half capacity loading
  4. Zero loading

Answer.2. Characteristics impedance loading

 

Ques.100. A string insulator has 4 units. The voltage across the lower most unit is 33.33% of the total voltage. The string efficiency of the insulator is:

  1. 100%
  2. 75%
  3. 50%
  4. 25%

Answer.2. 75%


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