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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 0.1 Ω
 50 Ω
 100 Ω
 10 Ω

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 any of above method.
 Ward Leonard control.
 rheostatic control.
 none of above.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting torque becomes low.
 the starting current will be enormously high.
 the motor may not start.
 the motor may run away.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 has no relation.
 directly.
 inversely.
 none of these.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 back to back test
None of these
 load test
 OC and SC tests

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

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

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