The plugging gives the
none of the above
highest torque braking
zero torque braking
smallest torque braking
highest torque braking
The direction of rotation of a D.C. series motor can be changed by
interchanging field terminals
interchanging supply terminals
either of and above
None of the above
interchanging field terminals
Which of the following application requires high starting torque ?
Air blower
Centrifugal pump
Lathe machine
Locomotive
Locomotive
If a D.C. motor is to be selected for conveyors which rriotor would be preferred ?
Shunt motor
Differentially compound motor
Series motor
Cumulative compound motor
Series motor
No-load speed of which of the following motor will be highest ?
Series motor
Differentiate compound motor
Cumulative compound motor
Shunt motor
Series motor
For a D.C. shunt motor if the excitation is changed
torque will change but power will remain constant
torque and power both will change
torque will remain constant
torque power and speed all will change
torque will change but power will remain constant
Which motor has the poorest speed control?
Shunt motor
Series motor
Differentially compounded motor
Cumulatively compounded motor
Series motor
Which D.C. motor will be preferred for machine tools ?
Shunt motor
Series motor
Cumulative compound motor
Differential compound motor
Shunt motor
Differentially compound D.C. motors can find applications requiring
frequent on-off cycles
variable speed
high starting torque
low starting torque
low starting torque
Which D.C. motor is preferred for elevators ?
Shunt motor
Series motor
Cumulative compound motor
Differential compound motor
Cumulative compound motor
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