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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 50Hz
 1 Hz
 2HZ
 2.5Hz

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 2 to 3 commutator segment.
 the width of the 1 to 2 commutator segment.
 less than the width of commutator segment.
 the width more than 3 commutator segment.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K²
 R1 /K
 K²R1
 K×R1

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 90o.
 0o.
 180o.
 dependent upon the load.

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

  0 Volt.
 1600 Volt.
 2000 Volt.
 1500 Volt.

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Electrical Machines
Which of these types of motor is used in elevators?

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

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