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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 0°
 70° to 85°
 25° to 30°

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its speed will reduce
 its power factor will reduce
 its efficiency will improve
 its speed will increase

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Electrical Machines
A shaded pole single phase induction motor can be used for

 wet grinders
 tape recorders
 personal computers as cooling fan
 food mixers

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 2/√5
 1/3
 1/√2
 1/√5

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Armature control.
 Field control.
 Multiple voltage control.
 Ward-Leonard control.

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 machine will generate maximum power.
 the voltage generated will be zero.
 machine will generate maximum voltage.
 field winding will burn.

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