Electrical Engineering · Question Bank

Fundamentals of Electricity

94 of 141 questions match · page 5 of 5. Answer in your head first, then check the solution.

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#81📘 EE Pocket Reviewer RojasEasy
Which one is an active material of a nickel-iron battery?
ANickel hydroxide
BPowdered iron and its oxide
C21% solution of caustic potash (KOH)
DAll of these
#82📘 EE Pocket Reviewer RojasEasy
A dead storage battery can be revived by ____.
AA dose of \(H_2SO_4\)
BAdding so-called battery restorer
CAdding distilled water
DNone of these (it cannot be revived)
#83📘 EE Pocket Reviewer RojasEasy
Which of the following is the best reason why nickel-cadmium cell is commonly used as power supplies to electronic calculators?
AIt is rechargeable
BIt is a dry type cell
CIt is easily manufactured
DIt has a standard shape
#84📘 EE Pocket Reviewer RojasEasy
The output voltage of a lead-acid cells ____.
A1.25 V
B1.35 V
C2.1 V
D6 V
#85📘 EE Pocket Reviewer RojasEasy
What happens if a lead-acid battery was left discharged for a longer time?
AIts acid will evaporate
BIts electrolyte will become more weak
CThe electrolyte will eat up the container
DThe plates will become sulphated
#86📘 EE Pocket Reviewer RojasEasy
For the process of electrolysis, what supply voltage is required?
Adc supply
Bac supply
CDc or ac supply but it should be varying
DDc or ac supply as long as it is constant
#87📘 EE Pocket Reviewer RojasEasy
Which one is an active material of a lead-acid cell?
ALead peroxide
BSponge lead
CDilute sulphuric acid
DAll of these
#88📘 EE Pocket Reviewer RojasEasy
Which of the following is considered a major drawback of a primary cell?
AChemical action is not reversible
BChemical action is reversible
CThe electrolyte used is expensive
DIt is not portable
#89📘 EE Pocket Reviewer RojasEasy
The best indication about the state of charge on a lead-acid battery is given by
AOutput voltage
BColor of electrolyte
CTemperature of electrolyte
DSpecific gravity of electrolyte
#90📘 EE Pocket Reviewer RojasEasy
In which of the following devices would a transistor battery be the best power choice?
AAn electronic calculator
BAn LCD wall clock
CA two-way portable radio
DA heart pacemaker
#91📘 EE Pocket Reviewer RojasEasy
Battery charging equipment is usually installed where?
AIn a well ventilated location
BIn a clean and dry places
CAs near as practical to the battery being charged
DAll of these
#92📘 EE Pocket Reviewer RojasEasy
A lead-acid cell is being charged. When the specific gravity of the electrolyte is about 1.25, the cell is ____ percent charged.
AAbout 75%
BAbout 25%
C100%
DAbout 50%
#93📘 EE Pocket Reviewer RojasEasy
Which of the following will work only on dc supply?
AElectric lamp
BHeater
CRefrigerator
DElectroplating
#94📘 EE Pocket Reviewer RojasEasy
Which of the following applications is using only a direct current?
ATraction
BVariable-speed applications
CElectrolysis
DIllumination

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