Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 119 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

101.

The internal resistance of a lead-acid cell is that of Edison cell____________?
A. less than
B. more than
C. equal to
D. none of the above
Answer» B. more than
Discussion
102.

The e.m.f. of an Edison cell, when fully charged, is nearly______________?
A. 1.4 V
B. 1 V
C. 0.9 V
D. 0.8 V
Answer» B. 1 V
Discussion
103.

The active materials of a nickel-iron battery are___________?
A. nickel hydroxide
B. powdered iron and its oxide
C. 21% solution of KOH
D. all of the above
Answer» E.
Discussion
104.

When a lead-acid battery is in fully charged condition, the color of its positive plate is__________?
A. dark grey
B. brown
C. dark brown
D. none of above
Answer» D. none of above
Discussion
105.

The charge required to liberate one gram equivalent of any substance is known as _________ constant
A. time
B. Faraday’s
C. Boltzman
Answer» C. Boltzman
Discussion
106.

During charging the specific gravity of the electrolyte of a lead-acid battery
A. increases
B. decreases
C. remains the same
D. becomes zero
Answer» B. decreases
Discussion
107.

The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity. The statement is associated with____________?
A. Newton’s law
B. Faraday’s law of electromagnetic
C. Faraday’s law of electrolysis
D. Gauss’s law
Answer» D. Gauss’s law
Discussion
108.

A battery of 6 cells will show a drop of _______ volts from fully charged state to fully discharged state
A. 1.0
B. 1.5
C. 2.4
D. 2.9
Answer» D. 2.9
Discussion
109.

As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its__________?
A. compactness
B. lower e.m.f.
C. small quantity of electrolyte used
D. higher internal resistance
Answer» E.
Discussion
110.

The capacity of a lead-acid cell depends on
A. rate of discharge
B. temperature
C. density of electrolyte
D. quantity of active materials
E. all above
Answer» F.
Discussion
111.

It is noticed that during discharging the following does not happen___________?
A. both anode and cathode become PbS04
B. specific gravity of H2SO4 decreases
C. voltage of the cell decreases
D. the cell absorbs energy
Answer» E.
Discussion
112.

The internal resistance of an alkali cell is nearly _________ times that of the lead-acid cell
A. two
B. three
C. four
D. five
Answer» E.
Discussion
113.

Weston standard cell at 20°C has voltage of _______ volts
A. 0.8
B. 0.9
C. 1.0187
D. 1.5
Answer» D. 1.5
Discussion
114.

In order that a hydrometer may float vertically in electrolyte its C.G. should be___________?
A. lowered
B. raised
C. undisturbed
D. displaced sideways
Answer» B. raised
Discussion
115.

In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following__________?
A. one part H2O, three parts H2SO4
B. two parts H2O, two parts H2SO4
C. three parts H2O, one part H2SO4
D. all H2S04
Answer» D. all H2S04
Discussion
116.

Excessive charging a battery tends to____________?
A. produce gassing
B. increase the internal resistance of the battery
C. to corrode the positive plates into lead peroxide thereby weakening them physically
D. bring about all above changes
Answer» E.
Discussion
117.

The following indicate that battery on charge has attained full charge___________?
A. colour of electrode
B. gassing
C. specific gravity
D. all above
Answer» E.
Discussion
118.

Dry cell is modification of____________?
A. Deniell cell
B. Leclanche cell
C. Lead-acid cell
D. Edison cell
Answer» C. Lead-acid cell
Discussion
119.

The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is____________?
A. just one
B. always greater than one
C. always less than one
D. none of the above
Answer» C. always less than one
Discussion