Electric Drives (3160919) MCQs

MCQs of DC motor characteristics

Showing 1 to 10 out of 71 Questions
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1.

The selection of an electric motor for any application depends on which of the following factors?

(a)

Electrical characteristics
(b)

Mechanical characteristics
(c)

Size, Cost and rating of motors
(d)

 All of these
Answer:

Option (d)

2.

For a particular application, the type of electric and control gear is determined by which of the following considerations?

(a)

Starting torque
(b)

Conditions of the environment
(c)

Speed control range and its nature
(d)

All of these
Answer:

Option (d)

3.

Which of the following motors are preferred for traction work?

(a)

Universal motor
(b)

D.C. series motor
(c)

Synchronous motor
(d)

Three-phase induction motor
Answer:

Option (b)

4.

Which of the following motors always starts on load?

(a)

Conveyor motor
(b)

Floor mill motor
(c)

Fan motor
(d)

All of these
Answer:

Option (d)

5.

_______________ is preferred for automatic drives.

(a)

Squirrel cage induction motor
(b)

Synchronous motors
(c)

Ward-Leonard controlled D.C. motors
(d)

Any of these
Answer:

Option (c)

6.

Ward-Leonard controlled D.C. drives are generally used for _______________ excavators

(a)

Light duty
(b)

Medium duty
(c)

Heavy duty
(d)

All of these
Answer:

Option (c)

7.

Which of the following motors are best for the rolling mills?

(a)

Single phase motors
(b)

Squirrel cage induction motors
(c)

Slip ring induction motors
(d)

D.C. motors
Answer:

Option (d)

8.

For which of the following applications D.C. motors are still preferred?

(a)

High-efficiency operation
(b)

Reversibility
(c)

Variable speed drive
(d)

High starting torque
Answer:

Option (c)

9.

In a paper mill where constant speed is required

(a)

synchronous motors are preferred
(b)

A.C. motors are preferred
(c)

individual drive is preferred
(d)

group drive is preferred
Answer:

Option (c)

10.

______________  has a relatively wider range of speed control.

(a)

Synchronous motor
(b)

D.C. shunt motor
(c)

Ship ring induction motor
(d)

Squirrel cage induction motor
Answer:

Option (b)

Showing 1 to 10 out of 71 Questions
1 2 3 4 5 6