Electrical Engineering Materials Multiple Choice Questions - ObjectiveBooks

Electrical Engineering Materials Multiple Choice Questions

Practice Test: Question Set - 10

1. Which of the following is the poorest conductor of electricity?
    (A) Carbon
    (B) Steel
    (C) Silver
    (D) Aluminium

2. Super conductivity can be destroyed by
    (A) Adding impurities
    (B) Reducing temperatures
    (C) Application of magnetic field
    (D) Any of the above

3. In graphite, bonding is
    (A) Covalent
    (B) Metallic
    (C) Vander Waals
    (D) Vander Waals and covalent

4. Carbon resistors are used extensively because they are
    (A) Easy to make
    (B) Compact
    (C) Inexpensive
    (D) All of the above reasons

5. Which of the following materials is used for making coils of standard resistances?
    (A) Copper
    (B) Nichrome
    (C) Platinum
    (D) Manganin

6. Which of the following factors affect resistivity of metals?
    (A) Age hardening
    (B) Alloying
    (C) Temperature
    (D) All of the above

7. Superconducting metal in super conducting state has relative permeability of
    (A) Zero
    (B) One
    (C) Negative
    (D) More than one

8. Copper, even though costly, finds use in the windings of electrical machines because
    (A) Copper points offer low contact resistance
    (B) Copper can be easily soldered and welded
    (C) Copper windings are less bulky and the machines become compact
    (D) All of the above

9. Is an element used in semiconductors whose atoms have three valence electrons?
    (A) An acceptor
    (B) A donor
    (C) Germanium
    (D) Silicon

10. The minority carrier concentration is largely a function of
    (A) Forward biasing voltage
    (B) Reverse biasing voltage
    (C) Temperature
    (D) The amount of doping

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