Index

SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generatorsMCQ-Control-SystemMCQ-Measurementsmcq-of-Generation-power-systemMCQ-of-Induction-MotorMCQ-of-Transmission-DistributionMCQ-of-Electrical-MachinesMCQ-of-Alternator-and-Synchronous-MotorsMCQ-Electric-PowerMCQ-Illumination

Multiple Choice Question (MCQ) of Materials page-9


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81. The permeability of iron can be increased by

A) alloying with cobalt
B) increasing carbon percentage
C) reducing carbon percentage
D) purifying it.

Ans : (A)

82. German silver is an alloy of

A) Silver & Copper
B) Silver, Copper & Zinc
C) Silver & Gold
D) Nickel, Copper & Zinc.

Ans : (D)

83. Ionization of a gas cannot be produced by

A) gold leaf electroscope
B) radioactive emanations
C) X-rays
D) heat.

Ans : (A)

84. Addition of 0.3% to 4.5% silicon to iron

A) reduces the saturation magnetization
B) reduces the hysteresis loss
C) increases the electrical resistivity of iron
D) none of the above.

Ans : (B)

85. Cementite is

A) Fe2C
B) FeC2
C) Fe3C
D) Fe3C2.

Ans : (C)

86. Magnetic recording tape is most commonly made from

A) iron-dust
B) small particles of iron
C) silicon-iron
D) ferric-oxide.

Ans : (D)

87. Gun metal contains

A) 81% Cu + 2% Zn + 10% Sn
B) 86% Cu + 9% Zn + 5% Sn
C) 84% Cu + 15% Zn + 1% Sn
D) 80% Cu + 15% Zn + 5% Sn.

Ans : (A)

88. Constantan is an alloy of

A) Copper and zinc
B) Copper & aluminium
C) Copper and nickel
D) Copper and lead.

Ans : (C)

89. When a ferromagnetic substance is magnetized small changes in dimensions occur. Such a phenomenon is known as

A) magneto-calorization
B) magnetostriction
C) magnetic expansion
D) magnetic hysteresis.

Ans : (B)

90. The intensity of magnetization, M, of a ferromagnetic solid

A) depends on method of heating
B) decreases with increasing temperature
C) increases with increasing temperature
D) is independent of temperature.

Ans : (B)


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