Objective Electrical Engineering Materials Questions and Answers pdf

71.    Which of the following is an advantage of stranded conductor over equivalent single conductor ?
(a)     Less liability to kink
(b)     Greater flexibility
(c)    Less liability to break
(d)    All of the above
Ans: d

72.    Due to which of the following reasons copper and aluminium are not used for heating elements ?
(a)    Both have great tendency for oxidation
(b)    Both have low melting point
(c)    Very large length of wires will be required
(d)    All of the above
Ans: d

73.    Copper, even though costly, finds use in the windings of electrical machines because
(a)     copper points offer low contact resistance
(b)     copper can be easily soldered and welded
(e)    copper windings are less bulky and the machines become compact
(d)     all of the above
 Ans: d

74.    Which of the following materials is used for making coils of standard resistances ?
(a)     Copper 
(b)     Nichrome
(c)     Platinum 
(d)     Manganin
Ans: d

75.    Substances whose specific resistance abruptly decreases at very low temperature are called
(a)     insulators 
(b)     conductors
(c)     semiconductors
(d)     superconductors
Ans: d

76.    Which of the following materials is the best conductor of electricity ?
(a)    Tungsten 
(b)    Aluminium
(c)    Copper 
(d)    Carbon
Ans: c

77.     is the property of absorbing moisture from atmosphere.
(a)    Solubility 
(b)    Viscosity
(c)    Porosity 
(d)    Hygroscopicity
Ans: d

78.    Thermocouples are mainly used for the measurement of
(a)     temperature  
(b)     resistance
(c)     eddy currents
(d)    coupling co-efficient
Ans: a

79.    Due to which of the following fact, in India, aluminium is replacing copper ?
(a)     Aluminium is more ductile and malleable than copper
(6)     Aluminium is available in plenty, cheaper and lighter than copper
(c)    Aluminium has lower resistivity than that of copper
(d)    Aluminium has less temperature co-efficient than copper
Ans: b

80.    The conduction of electricity, in semiconductors, takes place due to movement of
(a)     positive ions only
(b)     negative ions only
(c)    positive and negative ions
(d)    electrons and holes
Ans: d

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