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-35


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341. Most outstanding property of indium antimonide is

A) high carrier mobility
B) high resistivity at room temperature
C) a very wide range gap
D) very low conductivity at room temperature.

Ans : (A)

342. For high-speed reading and storing of information in a computer, the material used is

A) piezoelectric
B) ferrite
C) pyroelectric
D) perromagnetic above 768oC.

Ans : (B)

343. Enameled wires are preferred to cotton-covered wires to

A) increases the mechanical strength
B) reduce the resistivity
C) improve heat dissipation
D) withstand higher temperature.

Ans : (D)

344. The complex permeability and resulting wave losses are due to

A) bound electrons or ion oscillation and dipole relaxation
B) bound electrons oscillation and relaxations free space charge
C) free electrons oscillation and relaxation of free space charge
D) free electrons or iron oscillation and dipole relaxation.

Ans : (A)

345. The temperature above which an anti-ferromagnetic material becomes paramagnetic is called

A) Weiss temperature
B) Critical temperature
C) Neel temperature
D) Peak temperature.

Ans : (C)

346. Which one of the following materials are used for cable insulation?

A) Acrylonitrile butadiene styrene
B) Polyvinyl chloride
C) Polytetrafluoroethylene
D) Phenol formaldehyde.

Ans : (B)

347. Magnetic materials which may be readily magnetized in either direction are

A) high hysteresis loss materials
B) high eddy current loss materials
C) hard magnetic materials
D) soft magnetic materials.

Ans : (D)

348. If the diameter of copper wire is increased by two times keeping its terminal voltage same then the driff velocity will

A) become twice
B) become half
C) become four times
D) remain unchanged.

Ans : (D)

349. The impact ionization phenomenon in semiconductors may be viewed as the reverse process of

A) Shockley-Read-Hall recombination
B) Surface recombination
C) Auger recombination
D) Radiative recombination.

Ans : (C)

350. Which one of the following properties are not observed in the carbon nanotubes?

A) High stiffness and strengths
B) Low densities
C) Unusual electrical property
D) None-ductile.

Ans : (D)


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