Ques.91.For a single phase capacitor start induction motor, which of the following statements is valid?
-
- The direction of rotation can be changed by interchanging supply terminals.
- The direction of rotation cannot be changed.
- The direction of rotation can be changed by reversing main winding terminals.
- Single phase motor direction cannot be changed
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?
- Unity
- Leading
- Lagging
- None of the above
Ques.93. For a 400 V, 3 phase 3 wire star connected unbalanced load, the neutral point voltage can be
- 20 V
- 50 V
- 75 V
- 100 V
Ques.94. If supply voltage terminals for a DC shunt motor are reversed, then:
- It will run in the opposite direction
- It will run in the same direction
- Motor will stop
- Motor gets burn
Ques.95. If we observe the output waveform of DC generator on CRO, it will be like a
- Sinusoidal wave
- Square wave
- Constant voltage line
- 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:
- 0.24 H
- 0.9 H
- 0.18 H
- 0.36 H
Ques.97. A circuit whose behavior and characteristics is the same irrespective of the direction of current through the various elements is called:
- Unilateral
- Bilateral
- Lumped
- None of the above
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 :
- 3.33 A
- 5 A
- 2A
- 1A
Ques.99. Surge Impedance Loading of a transmission line is also known as :
- No loading
- Characteristics impedance loading
- Half capacity loading
- Zero 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:
- 100%
- 75%
- 50%
- 25%
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