ELECTRICAL MACHINES QUIZ

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

Same in both induction motors.

Slip ring induction motor.

Squirrel cage induction motor.

None of these

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If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

zero

maximum

All of these

minimum

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Rotating part of DC motor is known as

Starter.

Armature.

Pole.

Carbone brush.

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Which of the following induction motor has maximum speed?

2 pole.

6 pole.

4 pole.

8 pole.

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DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Heavy sparking at brushes.

Both of above.

None of these.

Heavy sparking at the first stud of starting resistance steps.

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What is the actual arrangement of series wound generator?

Armature and field both are connected.

Armature and field both are parallel.

Armature winding is in series with load.

Armature and field both are in series with the load.

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For standing a DC motor a starter is required because

It starts the motor.

it limits the speed of the motor.

it limits the starting current to a safe value.

None of these

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Damper winding is used to

increase the load current.

both 1 and 2.

decrease the load current.

suppress the hunting.

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

50Hz

2HZ

1 Hz

2.5Hz

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Which of the following motor is suitable for frequent starting and stoppings?

Resistance split phase motor

All of these

Capacitor start capacitor run motor

Capacitor start motor

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