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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

 non reversing drive
 reversing drive
 both 1 and 2
None of these

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Slip ring induction motor.
 Same in both induction motors.
None of these
 Squirrel cage induction motor.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = P/2*ωm
 ωe = P*ωm
 ωe = 2/P*ωm
 ωe = ωm

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 460 V
 230 V
 65 V
 115 V

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 decrease.
None of these
 either of these.
 increase.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 synchronous speed.
 any of the above.
 slip speed.
 normal speed.

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MORE MCQ ON Electrical Machines

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