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Electrical Engineering Materials

Study 100 Electrical Engineering MCQs with correct answers and explanations.

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71Electrical EngineeringMedium

Spark plug makes use of which of the following materials for insulation?

ASlate

BPorcelain

CGlass

DAsbestos

Correct answer

B. Porcelain

Explanation

The correct answer is Porcelain.

72Electrical EngineeringMedium

The conductivity of a metal is determined by________?

Anone of the above

Bthe number of valence electrons per atom

Ceither (A) or (B)

Dthe electronic concentration and the mobility of the free electrons

Correct answer

D. the electronic concentration and the mobility of the free electrons

Explanation

The correct answer is the electronic concentration and the mobility of the free electrons.

73Electrical EngineeringMedium

is the property of absorbing moisture from atmosphere________?

APorosity

BViscosity

CHygroscopicity

DSolubility

Correct answer

C. Hygroscopicity

Explanation

The correct answer is Hygroscopicity.

74Electrical EngineeringMedium

The carbon percentage is least in________?

Acast iron

Blow carbon steel

Cmalleable iron

Dwrought iron

Correct answer

D. wrought iron

Explanation

The correct answer is wrought iron.

75Electrical EngineeringMedium

For a particular material the Hall coefficient was found to be zero. The material is________?

Anone of the above

Binsulator

Cmetal

Dintrinsic semiconductor

Correct answer

C. metal

Explanation

The correct answer is metal.

76Electrical EngineeringMedium

For a hole which of the following statements is incorrect?

AHoles can be considered as a net positive charge

BHoles may constitute an electric current

CHoles can exist in any material including conductors

DHoles can exist in certain semiconductors only

Correct answer

C. Holes can exist in any material including conductors

Explanation

The correct answer is Holes can exist in any material including conductors.

77Electrical EngineeringMedium

Due to which of the following fact, in India, aluminium is replacing copper?

AAluminium is more ductile and malleable than copper

BAluminium is available in plenty, cheaper and lighter than copper

CAluminium has less temperature co-efficient than copper

DAluminium has lower resistivity than that of copper

Correct answer

B. Aluminium is available in plenty, cheaper and lighter than copper

Explanation

The correct answer is Aluminium is available in plenty, cheaper and lighter than copper.

78Electrical EngineeringMedium

At transition temperature the value of critical field is________?

Apositive real value

Bnegative real value

Ccomplex value

Dzero

Correct answer

D. zero

Explanation

The correct answer is zero.

79Electrical EngineeringMedium

Which of the following materials does not have covalent bonds?

AOrganic polymers

BMetals

CSilicon

Correct answer

B. Metals

Explanation

The correct answer is Metals.

80Electrical EngineeringMedium

Substances whose specific resistance abruptly decreases at very low temperature are called________?

Ainsulators

Bsuperconductors

Csemiconductors

Dconductors

Correct answer

B. superconductors

Explanation

The correct answer is superconductors.

The conductivity of a metal is determined by________?

Anone of the above

Bthe number of valence electrons per atom

Ceither (A) or (B)

Dthe electronic concentration and the mobility of the free electrons

Correct answer

D. the electronic concentration and the mobility of the free electrons

Explanation

The correct answer is the electronic concentration and the mobility of the free electrons.

For a hole which of the following statements is incorrect?

AHoles can be considered as a net positive charge

BHoles may constitute an electric current

CHoles can exist in any material including conductors

DHoles can exist in certain semiconductors only

Correct answer

C. Holes can exist in any material including conductors

Explanation

The correct answer is Holes can exist in any material including conductors.

Due to which of the following fact, in India, aluminium is replacing copper?

AAluminium is more ductile and malleable than copper

BAluminium is available in plenty, cheaper and lighter than copper

CAluminium has less temperature co-efficient than copper

DAluminium has lower resistivity than that of copper

Correct answer

B. Aluminium is available in plenty, cheaper and lighter than copper

Explanation

The correct answer is Aluminium is available in plenty, cheaper and lighter than copper.