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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 1 Hz
 50 Hz
 5 Hz

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Electrical Machines
In a transformer which of the following losses are zero?

 Rotational loss
 Copper loss
All of these
 Iron loss

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Electrical Machines
Induction motor operation depends on

 either of these.
 rotating magnetic field.
None of these
 stationary magnetic field.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 high filed circuit resistance.
 all of these.
 zero or very low voltage supply.
 over load.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T∝ V²
 T ∝ 1/V
 T ∝ V
 T ∝ 1/V²

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Electrical Machines
In DC machine shape of main field flux distribution is?

 triangular
 flat tapped or trapezoidal
 peaky in nature
 saddle shape

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