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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 between 50% and 90%.
 less than 50%.
 same.
 more.

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Electrical Machines
In field flux method speed control of DC Motor is

 constant power drive above base speed.
 constant torque drive above the base speed.
 constant hp drive below the base speed.
 constant torque drive below the base speed.

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = s2X2.
  R2 = s2X2.
  sR2 = X2.
  R2 = sX2.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

  60, 1500.
 50, 1500.
 60, 1440.
 1440, 1500.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  differential compounded.
  shunt.
  under-compounded.
  over compounded.

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Electrical Machines
Stepper motor is used in

All of these
 food processing
 traction
 computer printers

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MORE MCQ ON Electrical Machines

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