Electrical Engineering Materials MCQ - Set 01 - ObjectiveBooks

Electrical Engineering Materials MCQ - Set 01

Practice Test: Question Set - 01

1. The kinetic energy of a bounded electron is
    (A) Less than that of unbounded electron
    (B) Greater than that of unbounded electron
    (C) Equal to that of unbounded electron
    (D) Infinite

2. Superconductors are becoming popular for use in
    (A) Generating very strong magnetic field
    (B) Manufacture of bubble memories
    (C) Generating electrostatic field
    (D) Generating regions free from magnetic field

3. Solder is an alloy of
    (A) Copper and aluminium
    (B) Tin and lead
    (C) Nickel, Copper and zinc
    (D) Silver, copper and lead

4. Which of the following affect greatly the resistivity of electrical conductors?
    (A) Composition
    (B) Pressure
    (C) Size
    (D) Temperature

5. The resistivity of a metal is a function of temperature because
    (A) The amplitude of vibration of the atoms varies with temperature
    (B) The electron density varies with temperature
    (C) The electron gas density varies with temperature
    (D) None of the above

6. Due to which of the following factors the brush wear rate is altered?
    (A) Speed of the machine
    (B) Contact pressure
    (C) Surface conditions of brush and commutator
    (D) All of the above

7. Substances whose specific resistance abruptly decreases at very low temperature are called
    (A) Insulators
    (B) Conductors
    (C) Semiconductors
    (D) Superconductors

8. ________ has the best damping properties.
    (A) Diamond
    (B) High speed steel
    (C) Mild steel
    (D) Cast iron

9. For a particular material the Hall coefficient was found to be zero. The material is
    (A) Insulator
    (B) Metal
    (C) Intrinsic semiconductor
    (D) None of the above

10. The conduction of electricity, in semiconductors, takes place due to movement of
    (A) Positive ions only
    (B) Negative ions only
    (C) Positive and negative ions
    (D) Electrons and holes

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