MCQs of DC motor characteristics (Electric Drives - 3160919)

Showing 21 to 30 out of 71 Questions

21.

Belt conveyors offer

22.

Which type of Motor is best suited for the excavator?

23.

The DC shunt motor is running with a certain load. The effect of adding an external resistance in field circuit is to

24.

The series field of long shunt compound generator is excited by

25.

No-load speed of which of the following motor is highest?

(a)	Differentially compound motor
(b)	Cumulative compound motor
(c)	Series Motor
(d)	Shunt Motor

26.

No-load speed of which of the following motor is highest?

(a)	Differentially compound motor
(b)	Cumulative compound motor
(c)	Series Motor
(d)	Shunt Motor

27.

Which DC motor has the least percentage increase in Input current for the same percentage increase in torque?

28.

Counter EMF of the DC motor is

(a)	Less than the applied voltage
(b)	More than the applied voltage
(c)	Equal to the applied voltage
(d)	None of the above

29.

Why is the speed of DC shunt motor dependent on Back EMF?

(a)	Because flux is proportional to the armature current
(b)	Because armature drop is negligible
(c)	Because Back EMF is equal to armature current
(d)	Because flux is constant in DC shunt motor

30.

The reason for using starter while starting of DC motor is

(a)	To restrict armature current as there is no back E.M.F at starting
(b)	Motors are not self-starting
(c)	Restrict starting torque
(d)	None of the above

Showing 21 to 30 out of 71 Questions