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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 5
 10
 24
 12

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 0.98
 0.02, 1.98
 0.04, 1.96
 0.04, 0.96

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and low
 low and low
 high and high
 low and high

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Electrical Machines
Tappings of a transformer are provided

 at the phase end of hv side
 at the middle of hv side
 at the neutral side end of hv side
 at the phase end of lv side

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 both A and B
 iron loss
 mechanical loss
 copper loss

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The speed of motor.
 The voltage across the terminals.
 The torque required.
 None of above.

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