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DC Motors

DC Motors
A dc series motor is most suitable for

Lathes
Punch presses
Pump
Cranes

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DC Motors
The main disadvantage of the Ward-Leonard control method is

All of these
High maintenance cost
High initial cost
Low efficiency at high loads

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DC Motors
In dc machines fractional pitch winding is used

To increase the generated emf
To reduce the sparking
To reduce the generated emf
To improve cooling

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DC Motors
Which of the following methods gives the greatest braking torque?

Plugging
Rheostatic braking
None of the listed here
Regenerative braking

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DC Motors
Which D.C. motor has got maximum self loading property?

Differentially compounded motor
Series motor
Cumulatively compounded motor
Shunt motor

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DC Motors
The most suitable motor for elevators is the ____ motor.

Shunt
Series
Cummulative compounded
Differentially compuonded

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