Objective Questions on Electrical Engineering Materials - Set 06 - ObjectiveBooks

Objective Questions on Electrical Engineering Materials - Set 06

Practice Test: Question Set - 06

1. A good electric contact material should have all of the following properties except
    (A) High resistivity
    (B) High resistance to corrosion
    (C) Good thermal conductivity
    (D) High melting point

2. In thermocouples which of the following pairs is commonly used?
    (A) Copper-constantan
    (B) Aluminium-tin
    (C) Silver-German silver
    (D) Iron-steel

3. The coils of D.C. motor starter are wound with wire of
    (A) Copper
    (B) Kanthal
    (C) Manganin
    (D) Nichrome

4. A highly conductive material must have
    (A) Highest conductivity
    (B) Lowest temperature coefficient
    (C) Good mechanical strength & corrosion resistance
    (D) All of the above

5. On which of the following factors does the resistivity of a material depend?
    (A) Resistance of the conductor
    (B) Area of the conductor section
    (C) Length of the conductor
    (D) All of the above

6. Most of the common metals have _________ structure.
    (A) Linear
    (B) Hexagonal
    (C) Orthorhombic
    (D) Cubic

7. Low resistivity materials are used in
    (A) Transformer, motor and generator windings
    (B) Transmission and distribution lines
    (C) House wiring
    (D) All above applications

8. Effect of moisture on the insulating materials is to
    (A) Decrease dielectric constant
    (B) Decrease dielectric strength
    (C) Decrease insulation resistance
    (D) All of the above

9. For germanium the forbidden energy gap is
    (A) 0.15 eV
    (B) 0.25 eV
    (C) 0.5 eV
    (D) 0.7 eV

10. Selenium is ________ semiconductor.
    (A) Extrinsic
    (B) Intrinsic
    (C) N-type
    (D) P-type

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