Realtime Electrical Engineering Materials Multiple choice Questions and Answers pdf

21.    Mercury as an electric contact material is
(a)     a liquid
(b)     a metal
(c)     a metal liquid
(d)     a gas
 Ans: c

22.    An H.R.C. fuse is
(a)     a ceramic body having metal and caps
(b)     a wire of platinum
(c)    a heavy cross-section of copper or aluminium
(d)    a ceramic tube having carbon rod inside it
Ans: a

23.    Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
(a)     Nichrome
(b)     Constantan
(c)     Kanthal
(d)     Molybdenum
Ans: a

24.    The coils of D.C. motor starter are wound with wire of
(a)     copper
(b)     kanthal
(c)     manganin
(d)     nichrome
Ans: c

25.    The conductors have transport phenomena of electrons due to
(a)     electric field  
(b)     magnetic field
(c)    electromagnetic field
(d)    none of the above
Ans: a

26.    The transition temperature of mercury is
(a)     18.0°K
(6)     9.22°K
(c)     4.12°K
(d)     1.14'K
Ans: c

27.    By increasing impurity content in the metal alloy the residual resistivity always
(a)     decreases
(b)     increases
(c)    remains constant
(d)    becomes temperature independent
Ans: b

28.    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
Ans: c

29.    At transition temperature the value of critical field is
(a)     zero
(6)     negative real value
(c)    positive real value
(d)    complex value
Ans: a

30.    Which of the following variety of copper has the best conductivity ?
(a)    Induction hardened copper
(b)    Hard drawn copper
(c)    Pure annealed copper
(d)    Copper containing traces of silicon
Ans: c

Read More Questions:
Electrical Engineering Materials MCQs Part1
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Electrical Engineering Materials MCQs Part3
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