electrical engineering materials MCQs – Page 5

Practise focused electrical engineering materials questions with marked answers for exam preparation and subject revision.

electrical engineering materials Mcqs
81. An H.R.C. fuse is_______________?
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A. a wire of platinum

B. a ceramic tube having carbon rod inside it

C. a ceramic body having metal and caps

D. a heavy cross-section of copper or aluminium

82. Due to which of the following reasons copper and aluminium are not used for heating elements ?
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A. Both have great tendency for oxidation

B. Both have low melting point

C. Very large length of wires will be required

D. All of the above
83. The carbon percentage is least in__________________?
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A. wrought iron

B. malleable iron

C. cast iron

D. low carbon steel

84. Superconducting metal in super conducting state has relative permeability of________________?
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A. one

B. more than one

C. negative

D. zero
85. Which of the following materials does not have covalent bonds ?
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A. Silicon

B. Organic polymers

C. Metals
86. Which of the following affect greatly the resistivity of electrical conductors ?
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A. Size

B. Pressure

C. Composition

D. Temperature

87. ___________ is most commonly used for making magnetic recording tape?
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A. Ferric oxide

B. Silver nitrate

C. Silicon-iron

D. Small particles of iron

88. Low resistivity materials are used in__________?
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A. transformer, motor and generator windings

B. transmission and distribution lines

C. house wiring

D. all above applications
89. Superconductivity is observed for____________?
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A. none of the above

B. a.c. and high frequency

C. frequencies having no effect

D. infrared frequencies

E. d.c. and low frequency
90. Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
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A. Constantan

B. Molybdenum

C. Kanthal

D. Nichrome
91. Effect of moisture on the insulating materials is to________________?
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A. all of the above

B. decrease dielectric constant

C. increase dielectric loss

D. decrease insulation resistance

E. decrease dielectric strength

92. Super conductivity can be destroyed by_____________?
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A. any of the above

B. reducing temperatures

C. application of magnetic field

D. adding impurities

93. Substances whose specific resistance abruptly decreases at very low temperature are called___________?
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A. conductors

B. semiconductors

C. insulators

D. superconductors
94. is a negatively charged particle present in an atom______________?
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A. Electron

B. Proton

C. Neutron

D. None of the above

95. The formula __________ determines the number of electrons that can be accommodated in any level?
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A. 4ns

B. 2n3

C. 4n2

D. 2n2
96. For germanium the forbidden energy gap is_______________?
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A. 0.15 eV

B. 0.7eV

C. 0.25 eV

D. 0.5eV

97. The metal having the lowest temperature coefficient of resistance is_________________?
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A. aluminium

B. gold

C. copper

D. kanthal

98. Carbon rods are used in wet and dry cells because_____________?
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A. carbon rod serves as conductor

B. carbon can resist the attack of battery acid

C. both (A) and (B)

D. either (A) or (B)

99. Carbon electrodes are not used in_______________?
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A. electric arc furnace

B. GLS lamps

C. dry cells

D. cinema projectors

100. Which of the following materials is the best conductor of electricity ?
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A. Carbon

B. Copper

C. Tungsten

D. Aluminium