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-6


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51. The permeability and permittivity of a medium are

A) independent of each other
B) related by the atomic number
C) related by the Boltzmann’s constant
D) related by the velocity of electromagnetic waves.

Ans : (D)

52. Silicon steels are specified as E11, E41, E320 etc. In this first figure after E represents

A) direction of rolling
B) process of manufacturing
C) specific loss in steel a 50 Hz
D) percentage of silicon in steel.

Ans : (D)

53. The relative permeability of super-conducting materials is

A) zero
B) one
C) normal
D) infinitely large.

Ans : (A)

54. Main constituents of glass is

A) SiO2
B) B2O3
C) A12O3
D) CaCO3.

Ans : (A)

55. The effect of moisture in the insulating material is

A) to decrease dielectric constant
B) to increase dielectric loss
C) to increase dielectric strength
D) to increase insulation resistance.

Ans : (B)

56. For elastic materials stress and strain are related by

A) Poisson’s law
B) Dalton’s law
C) Gauss’s law
D) Hooke’s law.

Ans : (D)

57. Overhead telephone wires are

A) Aluminium wires
B) ACSR conductors
C) Steel wires
D) Copper wires.

Ans : (C)

58. Hardness of a material is resistance to

A) heating
B) machining
C) scratching
D) creep.

Ans : (C)

59. The percentage of carbon in cast iron is

A) 0.2 to 0.3 percent
B) 1 to 4 percent
C) 4 to 10 percent
D) 20 to 30 percent.

Ans : (B)

60. Carbon electrodes are not used in

A) GLS lamps
B) Dry cells
C) Cinema projectors
D) Electric arc furnace.

Ans : (A)


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