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-16


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151. Electric breakdown strength of a material depends on its

A) thickness
B) moisture content
C) composition
D) all of the above.

Ans : (D)

152. Dielectric strength of polythene is around

A) 10 kV/mm
B) 40 kV/mm
C) 100 kV/mm
D) 140 kV/mm.

Ans : (B)

153. An insulator will conduct when the

A) under none of the above conditions
B) under either of the condition in (C) or (D)
C) temperature is raised to a very high level
D) voltage applied is more than the breakdown voltage.

Ans : (B)

154. The crystal structure of silicon is

A) BCC
B) FCC
C) Diamond
D) simple cubic

Ans : (C)

155. Which photoconductor is widely used?

A) PbS
B) CdS
C) GaAs
D) As Br.

Ans : (B)

156. Thermionic emission of electrons is due to

A) photoelectric effect
B) high temperature
C) electrostatic field
D) electro magnetic field.

Ans : (B)

157. Which of the following has highest resistivity?

A) Manganin
B) Nichrome
C) Tantalum
D) Kanthal.

Ans : (D)

158. The resistivity of all normal metals as temperature is lowered

A) at first decreases and then increases
B) tends to a constant value
C) tends to zero
D) none of the above.

Ans : (C)

159. If the conductivity of pure germanium is 1.54 siemens/meters, its resistivity in ohm-meter will be nearly

A) 0.065
B) 0.65
C) 6.5
D) 65.

Ans : (B)

160. Which colour of flame represents the highest temperature?

A) Very faint yellow
B) Light purple
C) Brown yellow
D) Deep blue.

Ans : (D)


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