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Power Systems

Power Systems
Most commonly used material for insulator is

 porcelain
 glass
All of these
 mica

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Power Systems
What will be the thermal efficiency of a 240 V, 1000 W electric kettle if it brings 2 liters of water at 15° C to boiling point 15 Minutes

  74.56 %.
 80.25 %.
  79.33 %.
 78.96 %.

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Power Systems
The load duration curve for a system is 8 hours 30 MW, 16 hours 25 MW and 24 hours 20 MW. The load factor will be

 0.25.
 0.44.
 1.3.
  0.83.

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Power Systems
The rate of rise of re-striking voltage is dependent upon

 resistance of the system only
 capacitance of the system only
 both 1 and 2
 inductance of the system only

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Power Systems
When a transformer is loaded, the secondary terminal voltage gains. That means power factor is

 zero.
 unity.
 lagging.
  leading.

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Power Systems
Which of the following rotor is used in thermal power plants?

 squirrel cage rotor
 cylindrical rotor
 salient pole rotor
 either of these

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