electrical engineering materials MCQs – Page 3

Practise focused electrical engineering materials questions with marked answers for exam preparation and subject revision.

electrical engineering materials Mcqs

41. Due to which of the following fact, in India, aluminium is replacing copper ?
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A. Aluminium has lower resistivity than that of copper

B. Aluminium is available in plenty, cheaper and lighter than copper

C. Aluminium has less temperature co-efficient than copper

D. Aluminium is more ductile and malleable than copper

42. Which of the following is a semiconductor material ?
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A. Phosphorous

B. Rubber

C. Aluminium

D. Silicon

43. Which of the following are non-conductors of electricity?
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A. Non-metal solids except carbon

B. Air and most other gases

C. Pure water and liquids in general except mercury

D. All of the above

44. The conductivity of a conductor can be increased by_______________?
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A. increasing its temperature

B. decreasing its temperature

C. increasing its vibration

D. decreasing its vibration

45. A carbon resistor contains_____________?
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A. carbon crystals

B. pulverized coal

C. solid carbon granules

D. finely divided carbon black

46. Copper, even though costly, finds use in the windings of electrical machines because_____________?
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A. copper windings are less bulky and the machines become compact

B. copper points offer low contact resistance

C. all of the above

D. copper can be easily soldered and welded

47. _____________is viscoelastic?
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A. Cast-iron

B. Glass

C. Graphite

D. Rubber

48. The current due to electron flow in conduction band is the hole current in valence band?
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A. less than

B. any of the above

C. greater than

D. equal to

49. The value of critical field below the transition temperature will_______________?
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A. any of the above

B. increase

C. remain unchanged

D. decrease

50. The number of atoms per unit cell in B.C.C. structure is_____________?
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A. 8

B. 2

C. 1

D. 4

51. Most of the common metals have _________ structure?
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A. orthorhombic

B. hexagonal

C. cubic

D. linear

52. The covalent bond is formed by_______________?
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A. none of the above

B. transfer of electrons between atoms

C. sharing of variable number of electrons by a variable number of atoms

D. sharing of electrons between atoms

53. Which of the following is the poorest conductor of electricity ?
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A. Aluminium

B. Carbon

C. Steel

D. Silver

54. For a particular material the Hall coefficient was found to be zero. The material is______________?
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A. insulator

B. none of the above

C. intrinsic semiconductor

D. metal

55. A good electric contact material should have all of the following properties except_____________?
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A. high melting point

B. high resistance to corrosion

C. high resistivity

D. good thermal conductivity

56. The conductors have transport phenomena of electrons due to____________?
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A. electric field

B. none of the above

C. magnetic field

D. electromagnetic field

57. The impurity atoms is semiconductors_____________?
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A. inject more charge carriers

B. increase the kinetic energy of valence electrons

C. reduce the energy gap

D. all of the above

58. In a crystal, an atom vibrates at a frequency determined by_______________?
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A. the heat content of the crystal

B. the temperature of the crystal

C. the stiffness of the bonds it makes with neighbors

59. If the resistance of a conductor does not vary in accordance with Ohms law it is known as____________?
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A. bad-conductor

B. reverse conductor

C. non-conductor

D. non-linear conductor

60. A perfect conductor has_____________?
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A. unity conductivity

B. none of the above

C. infinite conductivity

D. zero conductivity

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