Electrical Engineering Materials Objective Questions - Set 05 - ObjectiveBooks

Electrical Engineering Materials Objective Questions - Set 05

Practice Test: Question Set - 05

1. The metal having the lowest temperature coefficient of resistance is
    (A) Gold
    (B) Copper
    (C) Aluminium
    (D) Kanthal

2. By increasing impurity content in the metal alloy the residual resistivity always
    (A) Decreases
    (B) Increases
    (C) Remains constant
    (D) Becomes temperature independent

3. _______ is the main constituent of glass
    (A) Fe2O3
    (B) SiO2
    (C) AI2O3
    (D) B2O3

4. Which of the following materials does not have covalent bonds?
    (A) Organic polymers
    (B) Silicon
    (C) Metals
    (D) None of the above

5. Which of the following are non-conductors of electricity?
    (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

6. Is the property of absorbing moisture from atmosphere?
    (A) Solubility
    (B) Viscosity
    (C) Porosity
    (D) Hygroscopicity

7. Spark plug makes use of which of the following materials for insulation?
    (A) Porcelain
    (B) Slate
    (C) Asbestos
    (D) Glass

8. In conductors conduction of electricity takes place due to movement of
    (A) Electrons only
    (B) Positive ions only
    (C) Negative ions only
    (D) Positive and negative ions

9. Total number of crystal systems is
    (A) 2
    (B) 4
    (C) 7
    (D) 12

10. Which of the following is an advantage of stranded conductor over equivalent single conductor?
    (A) Less liability to kink
    (B) Greater flexibility
    (C) Less liability to break
    (D) All of the above

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