Electrical Engineering Materials and Metallurgy MCQ - Set 03 - ObjectiveBooks

Electrical Engineering Materials and Metallurgy MCQ - Set 03

Practice Test: Question Set - 03

1. Superconductivity is observed for
    (A) Infrared frequencies
    (B) D.C. and low frequency
    (C) A.C. and high frequency
    (D) Frequencies having no effect

2. The structure sensitive property of a super conductor is
    (A) Critical magnetic field
    (B) Transition temperature
    (C) Critical current density
    (D) None of the above

3. _______ is viscoelastic.
    (A) Cast iron
    (B) Graphite
    (C) Rubber
    (D) Glass

4. Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron.
    (A) Increases
    (B) Decreases
    (C) Does not change
    (D) None of the above

5. Which of the following materials is preferred for transmitting electrical energy over long distance?
    (A) Copper
    (B) Aluminium
    (C) Steel reinforced copper
    (D) Steel reinforced aluminium

6. In a crystal, an atom vibrates at a frequency determined by
    (A) The heat content of the crystal
    (B) The temperature of the crystal
    (C) The stiffness of the bonds it makes with neighbours
    (D) None of the above

7. Steel wire is used as
    (A) Overhead telephone wire
    (B) Earth wire
    (C) Core wire of ACSR
    (D) All of the above

8. Due to which of the following fact, in India, aluminium is replacing copper?
    (A) Aluminium is more ductile and malleable than copper
    (B) Aluminium is available in plenty, cheaper and lighter than copper
    (C) Aluminium has lower resistivity than that of copper
    (D) Aluminium has less temperature coefficient than copper

9. The carbon percentage is least in
    (A) Low carbon steel
    (B) Wrought iron
    (C) Cast iron
    (D) Malleable iron

10. ________ is a negatively charged particle present in an atom.
    (A) Proton
    (B) Neutron
    (C) Electron
    (D) None of the above

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