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Electrical Machines

Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3%
 +3.33%
 -3.33%
 +3%

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 1500 rpm
 75 rpm
 3000 rpm
 375 rpm

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Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 any of the above
 half load
 no load
 full load

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Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - delta
 Delta - star
 Star - delta
 Star - star

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 remains constant.
 increase.
None of these
 decrease.

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