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DC Motors
DC Motors
Which method of braking is generally used in elevators?
Rheostat braking
Plugging
Regenerative braking
None of these
Rheostat braking
Plugging
Regenerative braking
None of these
Answer
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DC Motors
Which of the following motor is preferred for operation in highly explosive atmosphere?
Battery operated motor
Series motor
Shunt motor
Air motor
Battery operated motor
Series motor
Shunt motor
Air motor
Answer
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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 and power both will change
Torque will remain constant
Torque will change but power will remain constant
Torque, power and speed, all will change
Torque and power both will change
Torque will remain constant
Torque will change but power will remain constant
Answer
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DC Motors
If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ?
Shunt motor
Series motor
Cumulative compound motor
Differentially compound motor
Shunt motor
Series motor
Cumulative compound motor
Differentially compound motor
Answer
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DC Motors
If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking
Dynamic braking
None of these
Plugging
Regenerative
Dynamic braking
None of these
Plugging
Regenerative
Answer
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