DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Both of above.

None of these.

Heavy sparking at the first stud of starting resistance steps.

Heavy sparking at brushes.

Both of above.

None of these.

Heavy sparking at the first stud of starting resistance steps.

Heavy sparking at brushes.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

only field terminals are changed.

none of above.

only armature terminals are reversed.

either field terminals are reversed or armature terminals are reversed.

only field terminals are changed.

none of above.

only armature terminals are reversed.

either field terminals are reversed or armature terminals are reversed.

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Electrical Machines
In DC shunt motor if load is increased, the speed

increase proportional.

reduce slightly.

remains constant.

increased slightly.

increase proportional.

reduce slightly.

remains constant.

increased slightly.

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

same voltage magnitude

same phase sequence

same prime mover speed

same frequency

same voltage magnitude

same phase sequence

same prime mover speed

same frequency

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Electrical Machines
Hysteresis loss is proportional to

f.

f3.

f1.5.

f2.

f.

f3.

f1.5.

f2.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

increase and decrease respectively

decrease and increase respectively

both decrease

both increase

increase and decrease respectively

decrease and increase respectively

both decrease

both increase

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Electrical Machines

Electrical Machines DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines In shunt dc motor the direction of rotation of the motor will reversed. When

Electrical Machines In DC shunt motor if load is increased, the speed

Electrical Machines Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

Electrical Machines Hysteresis loss is proportional to

Electrical Machines A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

Electrical Machines
In DC shunt motor if load is increased, the speed

Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

Electrical Machines
Hysteresis loss is proportional to

Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will