Tricky Electrical Engineering Materials Multiple choice Questions and Answers pdf

81.    Which of the following is a semiconductor material ?
(a)     Phosphorous  
(b)     Rubber
(c)     Silicon 
(d)     Aluminium
Ans: c

82.    Selenium is _____ semiconductor.
(a)     extrnisic 
(b)     intmisic
(c)     N-type 
(d)     P-type
Ans: b

83.    ________ has the best damping properties.
(a)     Diamond 
(b)     High speed steel
(c)     Mild steel 
(d)     Cast iron
Ans: d

84.    The photo-electric effect occurs only when the incident light has more than a certain critical
(a)     intensity 
(b)     speed
(c)     frequency 
(d)     wave length
Ans: c

85.    If the resistance of a conductor does not vary in accordance with Ohm's law it is known as
(a)    non-linear conductor
(b)    reverse conductor
(c)    bad-conductor
(d)     non-conductor
Ans: a

86.    Spark plug makes use of which of the following materials for insulation ?
(a)     Porcelain 
(b)     Slate
(c)     Asbestos 
(d)     Glass
Ans: a

87.    The forbidden gap in an insulator is
(a)     large 
(b)     small
(c)     nil
(d)     any of the above
Ans: a

88.    Which of the following factors affect resistivity of metals ?
(a)     Age hardening
(b)     Alloying
(c)     Temperature  
(d)     Cold work
(e)     All of the above
Ans: e

89.    Effect of moisture on the insulating materials is to
(a)     decrease dielectric constant
(b)     decrease dielectric strength
(c)    decrease insulation resistance
(d)    increase dielectric loss
(e)    all of the above
Ans: e

90.    Surface resistance of an insulating material is reduced due to the
(a)     smoky and dirty atmosphere
(b)     humidity in the atmosphere
(c)    both (a) and (b)
(d)    neither (a) nor (b)
Ans: c

Read More Questions:
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