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ELECTRICAL MACHINES

Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Decreases.
 Remain unchanged
 None of above.
 Increases.

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Electrical Machines
Which of the following statements are correct ?

 A small value of leakage reactance will increase the maximum power output of motor.
 The leakage reactance of the induction motor should be small.
 Both 1 and 2.
None of these

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 as it carries large load current.
 to reduce the insulation of materials.
 to provide large flux.
 in order to reduce eddy current to provide large flux.

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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

 Shunt.
 Cummulative compound.
 Series.
 Differently compounded.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start motor
 Capacitor start capacitor run motor
 Resistance split phase motor
All of these

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