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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 square wave.
 sine wave.
 triangular wave.
  pulsed wave.

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Shaded pole motor.
  Stepper motor.
 Reluctance motor.
 Hysteresis motor.

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

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

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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

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

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 0.5Kw
 1.5KW
 2KW
 3KW

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 None of the options.
 Both B and C.
 Permanent magnets.
  Electromagnets.

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MORE MCQ ON Electrical Machines

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