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-34


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331. Manganese ferrite is a 1 : 1 mixture of

A) Manganese oxide and iron sulphide
B) Manganese nitride and iron sulphide
C) Manganese oxide and iron oxide
D) Manganese nitride and iron oxide.

Ans : (C)

332. When a ferromagnetic substance is magnetized, small changes in dimensions occur. Such a phenomenon is known as

A) Magneto-calorisation
B) Magnetostriction
C) Magnetic expansion
D) Magnetic hysteresis.

Ans : (B)

333. Materials, whose resistivity at very low temperature plunges from a finite value to zero and remains there upon further cooling, are known as

A) superconductors
B) ferrimagnetic materials
C) high energy hard magnetic materials
D) ferromagnetic materials.

Ans : (A)

334. In a superconductor, if the temperature decrease below is critical temperature, the value of critical magnetic field will

A) Increase
B) Decrease
C) Not change
D) Increase or decreases depending on the superconductor material.

Ans : (A)

335. Which of the following semiconducting components is used in photoconductive devices?

A) Zinc oxide
B) Lead sulphide
C) Barium oxide
D) Caesium antimode.

Ans : (B)

336. Fermion particles obey

A) Heisenberg,s uncertainty principle
B) Pauli’s exclusion principle
C) Bose-Einstein statistics
D) Maxwell-Boltzmann statistics.

Ans : (B)

337. The chief deterrent to the widespread application of superconducting materials is

A) the lower oxidation rate at elevated temperatures
B) the poor strength-to-weight ratio
C) the difficulty in attaining and maintaining extremely low temperature
D) very difficult to form, machine or cast.

Ans : (C)

338. The evidence for the importance of electron-phonon interaction in superconductors comes from

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

Ans : (B)

339. The electrical conductivity of semiconductors increases with increase in temperature because

A) the carrier concentration increases
B) the mobility of carrier increases
C) both carrier concentration and mobility increases
D) the band gap decreases.

Ans : (C)

340. The Hall Effect voltage in intrinsic silicon

A) is positive
B) is negative
C) is zero
D) changes its sign based on application of magnetic field.

Ans : (B)


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