1. Which of the following material has least value of dielectric strength?
(a) Transformer oil.
(b) Porcelain.
(c) Bakelite.
(d) Mica. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
2. Which of the following material has least melting point?
(a) Copper.
(b) Aluminium.
(c) Nickel.
(d) Tin. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
3. Which of the following material has highest melting point?
(a) Platinum.
(b) Cobalt.
(c) Brass.
(d) Steel. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
4. The melting point of copper is
(a) 630°C.
(b) 865°C.
(c) 1084°C.
(d) 1365°C. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
5. Which of the following material has least value of dielectric constant?
(a) Air.
(b) Fibre.
(c) Glass.
(d) Mica. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
6. Which of the following material is used to made up the lighting arrester?
(a) Porcelain.
(b) Bakelite.
(c) Silicon carbide.
(d) Silicon oxide. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
7. Which method can be used for heating of a non conducting material?
(a) Resistance heating.
(b) Induction heating.
(c) Radiant heating.
(d) Dielectric heating. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
8. Which method of heating can be used for a non ferrous material?
(a) Dielectric heating.
(b) Direct arc heating.
(c) Indirect arc heating.
(d) Eddy current heating. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
9. If the amount of carbon content is reduced, the melting point of steel is
(a) increases.
(b) decreases.
(c) remain same.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
10. Brass is an alloy of
(a) copper and tin.
(b) copper and zinc.
(c) aluminium and zinc.
(d) aluminium and tin. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
11. The material which have maximum ductility is
(a) mild steel.
(b) nickel.
(c) copper.
(d) aluminium. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
12. Which of the following is a mesomorphous material?
(a) Silver.
(b) Lead.
(c) Mica.
(d) Brass. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
13. Carbon is a
(a) conducting material.
(b) dielectric material.
(c) semiconductor material.
(d) non-conducting material. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
14. When the temperature of a magnetic material is increased above the curie point, it become
(a) paramagnetic.
(b) diamagnetic.
(c) ferromagnetic.
(d) non-magnetic. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
15. Which of the following is a superconductor material?
(a) copper.
(b) mercury.
(c) gold.
(d) silver. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]