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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

 4 %.
 1.5 %.
  zero.
  less than 1 %.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

All of these
 compensating winding
 pole chamfering
 pole stacking

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Electrical Machines
Which of the following generators are used in arc welding?

 shunt generators
 series generators
 differential compound generators
 cumulative compound generators

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.66 Ω.
  0.24 Ω.
 0.78 Ω.
 0.45 Ω.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea– Iara
 Vt= Ea + Iara
 Vt = Ea + Iara+ ILrs
 Vt = Ea + Ia(ra + rs)

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Electrical Machines
In most condition which frame of motor will be preferred?

 Open type.
 Drip proof.
 Splash proof.
  Totally enclosed fan coiled.

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