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DC MOTORS

DC Motors
If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking

None of these
Regenerative
Plugging
Dynamic braking

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DC Motors
If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ?

Cumulative compound motor
Series motor
Differentially compound motor
Shunt motor

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DC Motors
For a D.C. shunt motor if the excitation is changed

Torque, power and speed, all will change
Torque will remain constant
Torque and power both will change
Torque will change but power will remain constant

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DC Motors
Which of the following motor is preferred for operation in highly explosive atmosphere?

Shunt motor
Battery operated motor
Air motor
Series motor

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DC Motors
Which method of braking is generally used in elevators?

Regenerative braking
Plugging
Rheostat braking
None of these

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