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-19


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181. Secondary emission results

A) When a high velocity beam of electrons strikes a metal surface
B) When light rays fall on the metal surface
C) When metals are subjected to strong magnetic fields
D) When temperature of metals is raised to a level above the crystallization temperature.

Ans : (A)

182. Which of the following materials-can be used for temperatures upto 500oC?

A) Polythene
B) Mica
C) Paper oiled
D) Empire cloth.

Ans : (B)

183. The intensity of magnetization M of a ferromagnetic solid

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

Ans : (D)

184. Polythylene is produced by

A) addition polymerization
B) condensation
C) condensation polymerization
D) copolymerization of ethylene monomers.

Ans : (A)

185. The miller indices of the face ABCD will be

A) (0 1 0)
B) (0 0 1)
C) (1 0 0)
D) (1 1 1).

Ans : (C)

186. The type of bonding that exists in solid argon is

A) Vander Waals
B) ionic
C) covalent
D) a mixture of covalent and Vander Waals.

Ans : (A)

187. A non-crystalline polymer which can be stretched to more than twice its original length and which contracts quickly on releasing the load is known as

A) elastomer
B) plastic
C) dilatant
D) copolymer.

Ans : (A)

188. Figure of merit is used to

A) compare the extent of purity of semi-conductor materials
B) measured the extent of doping of intrinsic semiconductors
C) compare the efficiency of thermoelectric, materials.

Ans : (C)

189. Polystyrene is

A) an alky1 halide
B) a hydrocarbon
C) an alcohol
D) an ester.

Ans : (B)

190. Nickel is used in

A) pressure sensitive elements
B) electrodes of thermionic valves
C) bulb filaments
D) automatic voltage regulators.

Ans : (B)


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