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electrical engineering materials MCQs

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

electrical engineering materials Mcqs

1. A highly conductive material must have___________?
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A. easy solderable and drawable quality

B. all of the above

C. highest conductivity

D. good corrosion resistance

E. good mechanical strength

F. lowest temperature co-efficient

2. Which of the following is an advantage of stranded conductor over equivalent single conductor ?
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A. Less liability to break

B. Less liability to kink

C. All of the above

D. Greater flexibility

3. Superconductors are becoming popular for use in________________?
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A. manufacture of bubble memories

B. generating regions free from magnetic field

C. generating electrostatic field

D. generating very strong magnetic field

4. Platinum is used in_____________?
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A. electrical contacts

B. all of the above

C. thermocouple

D. grids of special purpose vacuum tubes

E. heating element in high temperature furnace

5. Due to which of the following factors the brush wear rate is altered ?
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A. All of the above

B. Contact pressure

C. Excessive sparking

D. Speed of the machine

E. Surface conditions of brush and commutator

6. is the property of absorbing moisture from atmosphere_____________?
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A. Viscosity

B. Hygroscopicity

C. Porosity

D. Solubility

7. The conductivity of a metal is determined by____________?
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A. either (A) or (B)

B. the electronic concentration and the mobility of the free electrons

C. none of the above

D. the number of valence electrons per atom

8. In thermocouples which of the following pairs is commonly used ?
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A. Silver-German silver

B. Iron-steel

C. Copper-constantan

D. Aluminium-tin

9. For a hole which of the following statements is incorrect ?
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A. Holes can be considered as a net positive charge

B. Holes may constitute an electric current

C. Holes can exist in certain semiconductors only

D. Holes can exist in any material including conductors

10. At transition temperature the value of critical field is____________?
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A. negative real value

B. zero

C. positive real value

D. complex value

11. is an element used in semiconductors whose atoms have three valence electrons?
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A. Germanium

B. A donor

C. Silicon

D. An acceptor

12. The forbidden gap in an insulator is________________?
0

A. small

B. large

C. any of the above

D. nil

13. Due to which of the following reasons aluminium does not corrode in atmosphere ?
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A. Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium

B. Aluminium is a noble metal

C. No reaction with oxygen occurs ft Any of the above

14. Which of the following materials is used for making coils of standard resistances ?
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A. Platinum

B. Copper

C. Nichrome

D. Manganin

15. __________ is the main constituent of glass?
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A. Fe203

B. Si02

C. AI2O3

D. B2O3

16. The superconductivity is due to____________?
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A. the crystal structure having no atomic vibration at 0K

B. the electrons jump into nucleus at 0K

C. none of the above

D. all electrons interact in the super-conducting state

17. Total number of crystal systems is____________?
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A. 2

B. 12

C. 4

D. 7

18. Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?
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A. increases

B. does not change

C. decreases

19. In graphite, bonding is____________?
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A. Vander Waals

B. metallic

C. Vander Waals and covalent

D. covalent

20. Which of the following materials is preferred for transmitting electrical energy over long distance ?
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A. Aluminium

B. Steel reinforced aluminium

C. Copper

D. Steel reinforced copper

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