Electrical Engineering Objective Questions and Answers Pdf - 1

Question: 1

The horsepower of steam locomotives is

(A) 3000 to 4000

(B) 2000 to 3000

(C) 1500 to 2000

(D) upto 1500

Ans: D

upto 1500

Question: 2

In which of the following applications, direct current is absolutely essential?

(A) traction

(B) variable speed operation

(C) electrolysis

(D) illumination

Ans: C

electrolysis

Question: 3

The internal efficiency of a mercury arc rectifier depends on

(A) r.m.s. value of current

(B) voltage and current

(C) current only

(D) voltage only

Ans: D

voltage only

Question: 4

When a lead acid battery is in fully charged condition, the colour of its positive plate is

(A) dark brown

(B) brown

(C) dark grey

(D) none of the above

Ans: A

dark brown

Question: 5

The watt-hour efficiency of a lead acid cell varies between

(A) 25 to 35%

(B) 40 to 60%

(C) 70 to 80%

(D) 90 to 95%

Ans: C

70 to 80%

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