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-27


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261. It is possible to destroy super-conductivity by

A) adding impurities
B) application of magnetic field
C) reducing temperature
D) any of the above.

Ans : (B)

262. The resistivity of super-conductor is

A) zero
B) unity
C) low
D) infinity.

Ans : (A)

263. The evidence for the importance of electron-phenon interaction in super-conductors comes from

A) Flux quantization experiments
B) Isotope effect
C) Josephon effect
D) Meissner effect.

Ans : (D)

264. Percentage of cadmium added to copper for improving its tensile strength is usually

A) 2 to 10 percent
B) 1 to 5 percent
C) 0.8 to 1 percent
D) 0.01 to 0.05 percent.

Ans : (C)

265. Resistance of copper

A) increases as it is compressed
B) decreases as it is compressed
C) does not vary when it is compressed.

Ans : (B)

266. All of the following materials can be used for permanent magnets EXCEPT

A) Platinum cobalt
B) Tungsten steel
C) Chromium steel
D) Alnico.

Ans : (A)

267. Which of the following is not a constituent of manganin ?

A) Manganese
B) Chromium
C) Nickel
D) Copper.

Ans : (B)

268. Which insulators are used for high frequency applications?

A) Stellite
B) Forsterite
C) Stealite
D) All of the high.

Ans : (B)

269. Rochelle salt is

A) NaK C2 H2 O3
B) NaK C4 H4 O8
C) NaK C6 4H2O
D) NaK C6 H6 O8.4H2O

Ans : (C)

270. Which of the following is closest to the purest form of iron?

A) Wrought iron
B) Nodular cast iron
C) Grey cast iron
D) Mild steel.

Ans : (A)


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