Objective Fundamentals of Electricity Questions – Electrical Engineering (Page 3)

#41📘 EE Pocket Reviewer RojasEasy

The ampere-hour capacity of the battery depends on which of the following?

AThickness of the plates

BCross-section area of the plates

CDistance between the plates

DStrength of the electrolytes

#42📘 EE Pocket Reviewer RojasEasy

Which of the following primary cells has the highest voltage?

ALithium cell

BMercury

CCarbon zinc

DManganese-alkaline

#43📘 EE Pocket Reviewer RojasEasy

The output voltage of a battery charger should be ____ the battery voltage.

AMore than

BEqual to

CLess than

DAny of these

#44📘 EE Pocket Reviewer RojasEasy

Distilled water is invariably used in electrolytes because it

APrevents polarization

BPrevents local action

CAccelerates electrochemical action

DImproves specific gravity of the electrolyte

#45📘 EE Pocket Reviewer RojasEasy

Which one is the most commonly used cell?

ALead-acid cell

BNickel-cadmium cell

CNickel-iron cell

DFuel cell

#46📘 EE Pocket Reviewer RojasEasy

What is the advantage of methanol over hydrogen for use in fuel cells?

AMethanol is easier to transport and store

BMethanol is solid at room temperature

CMethanol is the most abundant element in the universe

DMethanol is not flammable

#47📘 EE Pocket Reviewer RojasEasy

Five carbon-zinc cells in series have an output of

A7.5V

B11V

C15V

D50V

#48📘 EE Pocket Reviewer RojasEasy

What is the electrolyte used in a lead-acid ceil?

ANaOH

BOnly \(H_2SO_4\)

CKOH

DDilute \(H_2SO_4\)

#49📘 EE Pocket Reviewer RojasEasy

What will happen to the internal resistance of a fully discharged battery?

AIt will increase

BIt will decrease but will not dropped to zero

CIt remains the same as before

DIt will vanish completely

#50📘 EE Pocket Reviewer RojasEasy

The emf of a cell does not depend upon which of the following?

ASize and spacing of electrodes

BNature of electrolyte

CConcentration of electrolyte

DNature of material of electrolyte

#51📘 EE Pocket Reviewer RojasEasy

What is the purpose of connecting the cells in series?

ATo decrease the voltage output

BTo increase output voltage

CTo decrease the internal resistance

DTo increase the internal resistance

#52📘 EE Pocket Reviewer RojasEasy

Which one is a disadvantage of mercury cells?

AThey don't last as long as the other types

BThey have a flat discharge curve

CMercury is destructive to the environment

DThey need to be recharge often

#53📘 EE Pocket Reviewer RojasEasy

The condition of a secondary cell can be determined using which of the following?

AValue of its terminal voltage

BStrength of its electrolyte

CLevel of its electrolyte

DBoth A and B

#54📘 EE Pocket Reviewer RojasEasy

What is the usual ampere-hour efficiency of a lead acid cell?

A90%

B50%

C70%

D25%

#55📘 EE Pocket Reviewer RojasEasy

In which of the following appliances would you choose a lithium battery?

AA two way portable radio

BA rechargeable table lamp

CA microcomputer memory back up

DA stand-alone solar electric system

#56📘 EE Pocket Reviewer RojasEasy

Impurities in the electrolyte in a lead acid cell can cause internal short circuits called

ASulphation

BElectrolysis

CPolarization

DLocal action

#57📘 EE Pocket Reviewer RojasEasy

The chemical energy of a battery or cell ____.

AIs caused by electric current

BCannot be replenished once it is gone

CChanges to electrical energy when the cell is discharged

DIs stored in the electrolyte only

#58📘 EE Pocket Reviewer RojasEasy

A partially discharged storage battery can be brought back to fully charged state by which of the following?

AAdd sulphuric acid to the electrolyte

BAdd distilled water to the electrolyte

CConnect the battery terminals to a dc source

DConnect the battery terminals to an ac source

#59📘 EE Pocket Reviewer RojasEasy

Which one is true about an alkaline cell in comparison to a carbon-zinc cell?

AIt has shorter shelf life

BIt is cheaper

CIt generally works better in transistor radios

DIt has higher voltages

#60📘 EE Pocket Reviewer RojasEasy

Which one is an advantage of a secondary cell over a primary cell?

AIt can be recharged

BIt is portable

CIt is smaller in size

DIt has a higher capacity

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