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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 200 V
 460 V
 230 V
 115 V

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Gross power.
 Output power at the shaft.
 Power drawn in KW.
 Power drawn in KVA.

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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

 1.24.
 0.62.
 0.25.
 0.72.

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1400W, 1000W
 1000W , 1400W
 1600W, 800W
 800W, 1600W

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Electrical Machines
Commutators in DC machines have a role of which converts

 none of these.
 high voltage DC to low voltage DC.
 Both AC to DC and DC to AC.
 AC to DC.

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 V²
 1/V
 supply voltage V
 1/V²

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