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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 unity
 leading
 lagging
 zero

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.25.
 1.24.
 0.62.
 0.72.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 2/√5
 1/√2
 1/3
 1/√5

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction.
 it will run in opposite direction.
 it will run in same direction by slowly.
 motor will not run.

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Electrical Machines
Which of the following motors has negative speed regulation?

 Both B and C.
 Shunt motors.
 Series motors.
 Differential compound motors.

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Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
None of these
 DC series motors.
 DC shunt motors.

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