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-4


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31. Which of the following pairs is commonly used in thermocouples?

A) Copper-constant
B) Aluminium-tin
C) Iron-steel
D) Silver-German silver.

Ans : (A)

32. The temperature beyond which substance lose their ferroelectric properties is known as

A) Conversion temperature
B) Inversion temperature
C) Curie temperature
D) Critical temperature.

Ans : (C)

33. When a current is passed through the junction of two different metals, heat is absorbed or liberated depending on the direction of the current the above phenomenon is known as

A) Peltier effect
B) Joules effect
C) Kelvin effect
D) None of the above.

Ans : (A)

34. Materials having a high dielectric constant, which is non-linear, are known as

A) head dielectric
B) super-dielectric
C) elastomers
D) ferroelectric materials.

Ans : (D)

35. Thermocouple work on which of the following effects?

A) Joule effect
B) Peltier effect
C) Seeback effect
D) Thomson effect.

Ans : (C)

36. Which of the following material can be used for temperatures upto 500oC

A) Polythene
B) Mica
C) Paper-oiled
D) Empire cloth.

Ans : (B)

37. When a loop composed of two dissimilar metals could be made to carry a continuous current simply by maintaining the two junctions at different temperatures, the above effect is known as

A) Seeback effect
B) Peltier effect
C) Thompson effect
D) Thomson effect.

Ans : (A)

38. Which material can be used at temperatures above 100oC?

A) Rubber
B) Polythene
C) Paraffin wax
D) Teflon.

Ans : (D)

39. Insulating material used in spark plugs is

A) Polysterene
B) Mica
C) Porcelain
D) Rubber.

Ans : (C)

40. Dielectric strength of which of the following material is the highest?

A) Polystyrene
B) Glass
C) Soft rubber
D) Porcelain.

Ans : (A)


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