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-2


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11. If a body has identical properties all over, it is known as

A) Isotropic
B) Homogeneous
C) Isotropic
D) Elastic.

Ans : (B)

12. For carrying an electric current of 75 A an aluminium conductor should have a minimum cross-section of

A) 10 mm2
B) 20 mm2
C) 25 mm2
D) 100 mm2.

Ans : (C)

13. If a pair of metal is made to have a temperature difference between its two ends, an e.m.f. is observed to exist between those ends. The above phenomenon is known as

A) Kelvin effect
B) Peltier effect
C) Seebeck effect
D) Thomson effect.

Ans : (C)

14. Which variety of copper has the best conductivity?

A) Copper containing traces of silicon
B) Induction hardened copper
C) Hard drawn copper
D) Pure annealed copper.

Ans : (D)

15. Which variety of copper has the best mechanical strength?

A) Hard drawn copper
B) Annealed copper
C) Cast copper
D) Soft copper.

Ans : (A)

16. The materials which undergo recoverable deformation and exhibit rubber-like elasticity are called

A) Elasto-plastic
B) Creep-elastic
C) Elastomers
D) Rubbers.

Ans : (C)

17. Aluminium ore is known as

A) hematite
B) galena
C) bauxite
D) alum.

Ans : (C)

18. The materials which exhibit the same elastic properties in all directions are called

A) Visco elastic
B) Inelastic
C) Isentropic
D) Isotropic.

Ans : (D)

19. Which of the following materials has a negative resistance temperature coefficient ?

A) Carbon
B) Tin
C) Steel
D) Tungsten.

Ans : (A)

20. Which of the following is expected to be strongest in tension ?

A) Aluminium wire
B) Stainless steel wire
C) Brass wire
D) Piano wire.

Ans : (B)


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