Electrical Engineering Mcqs Practice Test

Question 1

In D.C. machines the width of the duct is usually_____________?

Accepted Answer

D. 10 mm

Question 2

In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?

Accepted Answer

A. increase

Question 3

Which of the following methods may be adopted to reduce the effects of armature reaction  ?

Accepted Answer

E. All of the above

Question 4

In D.C. machines the number of slots per pole usually lies___________?

Accepted Answer

C. between 9 to 16

Question 5

In transformers using hot rolled steel, the cross-section of the yoke is made about __________ greater than that of the core?

Accepted Answer

C. 15 percent

Question 6

Power transformers have rating_______________?

Accepted Answer

C. above 200 kVA

Question 7

____________are always double layer type?

Accepted Answer

A. Closed windings

Question 8

The winding where dummy coils are used is sometimes called______________?

Accepted Answer

C. forced winding

Question 9

When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of_____________?

Accepted Answer

B. full pitch

Question 10

The distance between the starts of two consecutive coils measured in terms of coil sides is called_____________?

Accepted Answer

B. winding pitch

Question 11

Dummy coil should not be used in_________________?

Accepted Answer

B. large machines

Question 12

Power transformers should be designed to have maximum efficiency________________?

Accepted Answer

C. at or near full load

Question 13

Yokes with rectangular cross-section are used for_______________?

Accepted Answer

A. small capacity transformers

Question 14

Which of the following methods is most accurate  ?

Accepted Answer

A. Equivalent current method

Question 15

____________are used for construction of core of electromagnets?

Accepted Answer

A. Soft magnetic materials

Question 16

Tractive magnets are operated from____________?

Accepted Answer

C. either a.c. or d.c. supplyD. none of the above

Question 17

Which of the following is the commonly used type of electromagnets  ?

Accepted Answer

D. All of the above

Question 18

The design of electromagnets is based upon which of the following fundamental equations ?

Accepted Answer

E. All of the above

Question 19

electromagnets generally function as holding magnets ?

Accepted Answer

B. Portative

Question 20

By which of the following methods motor rating for variable load drives can be determined  ?

Accepted Answer

E. All of the above