Objective of Electrical Engineering Materials - Set 09 - ObjectiveBooks

Objective of Electrical Engineering Materials - Set 09

Practice Test: Question Set - 09

1. Mercury as an electric contact material is
    (A) A liquid
    (B) A metal
    (C) A metal liquid
    (D) A gas

2. Constantan contains
    (A) Silver and tin
    (B) Copper and tungsten
    (C) Tungsten and silver
    (D) Copper and nickel

3. Carbon rods are used in wet and dry cells because
    (A) Carbon rod serves as conductor
    (B) Carbon can resist the attack of battery acid
    (C) Both (A) and (B)
    (D) Either (A) or (B)

4. The covalent bond is formed by
    (A) Transfer of electrons between atoms
    (B) Sharing of electrons between atoms
    (C) Sharing of variable number of electrons by a variable number of atoms
    (D) None of the above

5. A perfect conductor has
    (A) Zero conductivity
    (B) Unity conductivity
    (C) Infinite conductivity
    (D) None of the above

6. In a superconductor the value of critical density depends upon
    (A) Magnetic field strength
    (B) Temperature
    (C) Either (A) or (B)
    (D) Both (A) and (B)

7. Carbon bearings are used under which of the following conditions?
    (A) Where lubrication is difficult or impossible
    (B) Where corrosive chemical action exists
    (C) Where high temperature exists
    (D) All of the above

8. An H.R.C. fuse is
    (A) A ceramic body having metal and caps
    (B) A wire of platinum
    (C) A heavy cross-section of copper or aluminium
    (D) A ceramic tube having carbon rod inside it

9. Which of the following variety of copper has the best conductivity?
    (A) Induction hardened copper
    (B) Hard drawn copper
    (C) Pure annealed copper
    (D) Copper containing traces of silicon

10. ________ is an example of piezoelectric material.
    (A) Glass
    (B) Quartz
    (C) Corundum
    (D) Neoprene

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