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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 any of the above
 linearised
 hyperbola
 parabola

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 No wave and lap winding.
 Lap winding.
 Both wave and lap winding.
 Wave winding.

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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

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

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 mechanical loss
 iron loss
 both A and B
 copper loss

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Electrical Machines
Induction motor operation depends on

None of these
 either of these.
 rotating magnetic field.
 stationary magnetic field.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

  Full load.
 Low load.
 None of these.
 No load.

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MORE MCQ ON Electrical Machines

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