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-29


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281. Super-conductors are popularly used for

A) generating regions free from magnetic field
B) generating electrostatic field
C) reducing I2R losses
D) generating very strong magnetic field.

Ans : (D)

282. Dielectric loss in ferrites is

A) zero
B) very high
C) very low.

Ans : (B)

283. The converse of magnetostriction effect is

A) Neel effect
B) Villari effect
C) Curie effect
D) Thompson effect.

Ans : (B)

284. Super-conductivity results due to

A) crystal structure having infinite atomic vibrations at 0oK
B) all electrons interacting in the super-conducting gate
C) crystal structure having no atomic vibration at 0oK
D) all electrons having fermi energy at 0oK.

Ans : (C)

285. At Neel temperature

A) susceptibility is minimum
B) susceptibility is maximum
C) permeability is maximum
D) permeability is minimum.

Ans : (B)

286. Soft magnetic materials are widely used in

A) transformer cores
B) televisions
C) transducers
D) meters.

Ans : (A)

287. The number of electrons, protons, and neutrons in an atom having atomic number 11 and mass number 24 is respectively

A) 0, 13, 11
B) 11, 11, 13
C) 2, 11, 13
D) 3, 11, 13.

Ans : (B)

288. For Brinell hardness test

A) a ball of 1.5875 mm is used
B) a diamond cone of 136o is used
C) a diamond cone of 120o is used
D) a ball of 10 mm diameter is used.

Ans : (D)

289. The light emitted by a glow worm is due to

A) internal generation
B) reflection of moon light
C) bioluminiscence
D) fluorescence.

Ans : (C)

290. The dielectric strength of transformer oil soul be

A) 132 kV
B) 30 kV
C) 5 kV
D) 1000 V.

Ans : (B)


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