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Basic Electrical MCQs

Study 121 Electrical Engineering MCQs with correct answers and explanations.

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51Electrical EngineeringMedium

If/, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to________?

AI2R2t

BI2Rf

CI2Rt

Correct answer

C. I2Rt

Explanation

The correct answer is I2Rt.

52Electrical EngineeringMedium

Current velocity through a copper conductor is________?

Athe same as propagation velocity of electric energy

Bnearly 3 x 108 m/s

Cindependent of current strength

Dof the order of a few ^.s/m

Correct answer

D. of the order of a few ^.s/m

Explanation

The correct answer is of the order of a few ^.s/m.

53Electrical EngineeringMedium

Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across________?

ARi

Beither Rl or Ri

CRl

Dnone of them

Correct answer

C. Rl

Explanation

The correct answer is Rl.

54Electrical EngineeringMedium

Which of the following can have negative temperature coefficient ________?

AMetallic alloys

BElectrolytes

CLiquid metals

DCompounds of silver

Correct answer

B. Electrolytes

Explanation

The correct answer is Electrolytes.

55Electrical EngineeringMedium

A field of force can exist only between________?

Atwo molecules

Btwo atoms

Ctwo metal particles

Dtwo ions

Correct answer

D. two ions

Explanation

The correct answer is two ions.

56Electrical EngineeringMedium

The ratio of mass of proton to that of electron is nearly________?

A30

C1840

Correct answer

C. 1840

Explanation

The correct answer is 1840.

57Electrical EngineeringMedium

Two resistors are said to be connected in series when________?

Atotal current equals the sum of branch currents

Bsum of IR drops equals the applied e.m.f.

Csame current passes in turn through both

Dboth carry the same value of current

Correct answer

C. same current passes in turn through both

Explanation

The correct answer is same current passes in turn through both.

58Electrical EngineeringMedium

Out of the following which is not a poor conductor________?

ATungsten

BCopper

CCarbon

DCast iron

Correct answer

B. Copper

Explanation

The correct answer is Copper.

59Electrical EngineeringMedium

Internal resistance of ideal voltage source is?

Ainfinite

B100 ohms

Czero

Dfinite

Correct answer

C. zero

Explanation

Internal resistance of ideal voltage source is

60Electrical EngineeringMedium

A closed switch has a resistance of________?

Ainfinity

Bzero

Cabout 500 ohms

Dabout 50 ohms

Correct answer

B. zero

Explanation

The correct answer is zero.

Two resistors are said to be connected in series when________?

Atotal current equals the sum of branch currents

Bsum of IR drops equals the applied e.m.f.

Csame current passes in turn through both

Dboth carry the same value of current

Correct answer

C. same current passes in turn through both

Explanation

The correct answer is same current passes in turn through both.