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-5


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41. Bakelite is

A) highly inflammable
B) low resistance conductor
C) a semi-conductor
D) uncombustible.

Ans : (D)

42. The electric breakdown strength of a material depends on its

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

Ans : (D)

43. The material which has zero temperature coefficient of resistance is

A) Aluminium
B) Carbon
C) Porcelain
D) Manganin.

Ans : (D)

44. Electric stress is expressed in terms of

A) kV/cm
B) Farad/cm
C) Henry/cm
D) Ohms/cm.

Ans : (A)

45. Which type of thermostat is generally used in appliances with heating elements ?

A) Circuit breaker
B) Clad metal
C) Magnetic
D) Bimetallic.

Ans : (D)

46. Poorest conductor of electricity is

A) Silver
B) Carbon
C) Steel
D) Aluminium.

Ans : (B)

47. Which of the following is a ceramic material

A) Nylon
B) Invar
C) MgO
D) Leather.

Ans : (C)

48. Which of the following materials has the best damping properties?

A) Diamond
B) Cast iron
C) Mind steel
D) High speed steel.

Ans : (B)

49. An atom in a crystal vibrates at a frequency determined by

A) the atomic number of the metal
B) the heat content of the crystal
C) the temperature of the crystal
D) the stiffness of the bonds it makes with its neighbours.

Ans : (C)

50. The number of semi-conductors in periodic table is

A) 13
B) 7
C) 5
D) 3.

Ans : (A)


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