MCQs of DC motor characteristics (Electric Drives - 3160919)

Showing 11 to 20 out of 71 Questions

11.

Which of the following motors are preferred when smooth and precise speed control over a wide range is desired?

(a)	D.C. motor
(b)	Squirrel cage induction motor
(c)	Wound rotor induction motor
(d)	Synchronous motor

12.

For a D.C. shunt motor which of the following is incorrect?

(a)	Unsuitable for heavy duty starting
(b)	Torque varies as armature current
(c)	Torque-armature current is a straight line
(d)	Torque is zero for zero armature current

13.

In series motor which of the following methods can be used for changing the flux per pole?

14.

__________ drive is also called as Line shaft drive

15.

The advantages of a group driver electric drive are

16.

The disadvantages of group drive electric machine is/are

(a)	Low efficiency
(b)	Low overload capacity
(c)	Can’t be used for constant operation
(d)	All of these

17.

In __________ drive each machine is driven by its own separate motor with the help of gears and pulley

18.

The advantages of the individual drive is/are

(a)	Flexibility in operation
(b)	Each machine can be run or stop as desired
(c)	Maintenance of Lineshaft, the bearing is eliminated
(d)	All of these

19.

The drive which is used for metal-cutting machines tools, rolling mills etc. are

20.

The capacity of a crane is expressed in terms of

Showing 11 to 20 out of 71 Questions