Q.1 Materials which can store electrical energy are called
(A) magnetic materials. (B) semi conductors.
(C) dielectric materials. (D) super conductors.
Ans: C
Q.2 ACSR (Aluminium Conductor Steel Reinforced) are used as
(A) over head transmission lines. (B) super conductors.
(C) fuse (D) underground cables.
Ans: A
Q.3 Brass is an alloy of
(A) copper and zinc. (B) copper and iron.
(C) copper and Aluminium. (D) copper and tin.
Ans: A
Q.4 Property of material which allows it to be drawn out into wires is
(A) Ductility. (B) Solder ability.
(C) Super conductivity. (D) Malleability.
Ans: A
Q.5 In n type semi conductor added impurity is
(A) pentavalent. (B) divalent.
(C) tetravalent. (D) trivalent.
Ans: A
Q.6 The covers of electrical machines are made of
(A) soft magnetic materials. (B) hard magnetic materials.
(C) super conductors. (D) semiconductors.
Ans: A
Q.7 The dielectric constant of air is practically taken as
(A) more than unity. (B) unity.
DE04 ENGINEERING MATERIALS
2
(C) less than unity. (D) zero.
Ans: B
Q.8 n-type semiconductor is an example of
(A) extrinsic semiconductor. (B) intrinsic semiconductor.
(C) super conductor. (D) insulators..
Ans: A
Q.9 Atomic weight of an atom is
(A) sum of the number of protons and neutrons.
(B) sum of the number of protons and electrons.
(C) sum of the number of electrons and neutrons.
(D) sum of the number of electrons, protons and neutrons.
Ans: A
Q.10 Gold and silver are
(A) dielectric materials
(B) low resistivity conducting materials.
(C) magnetic materials.
(D) insulating materials.
Ans: B
Q.11 Phenol and Formaldehyde are polymerised to a resultant product known as
(A) PVC. (B) bakelite.
(C) polyester. (D) teflon.
Ans: B
Q.12 Dielectric materials are
(A) Insulating materials. (B) Semiconducting materials.
(C) Magnetic materials. (D) Ferroelectric mater
No comments:
Post a Comment