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Electrical Machines

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

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

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Electrical Machines
Voltage regulation can be determined by which of the following?

 ZPF method.
All of these
 MMf method.
 Synchronous impedance method.

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 33.3%
 66.3%
 57.7%
 50%

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor armature terminal.
 generator armature terminal.
 generator field terminal.
 motor field terminal.

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  reducing the load voltage.
 cooling the armature.
  increasing the input to the prime mover.
  increasing the excitation.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 5.7 ohms.
 6 ohms.
 1.9 ohms.
 2.2 ohms.

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MORE MCQ ON Electrical Machines

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