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-17


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161. Which of the following is hardest ?

A) Cementite
B) Austenite
C) Pearlite
D) Ferrite.

Ans : (B)

162. A close packed hexagonal space lattice is found in

A) calcium, magnesium and aluminium
B) aluminium, copper and lead
C) cobalt, antimony and bismuth
D) chromium, tungsten and molybdenum.

Ans : (C)

163. An allotropic material has

A) atoms distributed in random pattern
B) different crystal structure at different temperatures
C) fixed structures at all temperatures
D) none of the above.

Ans : (B)

164. Find the old one out

A) Polyurethane
B) Polyster
C) Nylon
D) Acetal.

Ans : (B)

165. Which allotropic form of iron is magnetic at room temperature?

A) Gamma iron
B) Alpha iron
C) Beta iron
D) Delta iron.

Ans : (B)

166. A good electric contact material should have all of the following properties EXCEPT

A) high resistivity
B) high resistance to erosion
C) good thermal conductivity
D) high melting point.

Ans : (A)

167. Find the odd one out

A) Polyster
B) Phenolic
C) Silicon
D) PVC.

Ans : (D)

168. The electric breakdown strength is affected by

A) composition of the material
B) steepness of the waveform of the applied voltage
C) shape of the waveform of applied voltage
D) all of the above.

Ans : (D)

169. High conductivity copper and a 60/40 copper-nickel alloy are used as thermocouple materials for temperature upto

A) 500o C
B) 900o C
C) 1100o C
D) 1500o C.

Ans : (A)

170. When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on surface then

A) photons are emitted
B) no electrons are emitted
C) electrons of higher energy are emitted
D) electrons of lower energy are emitted.

Ans : (B)


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