Most recently Electrical Engineering Materials Multiple choice Questions and Answers pdf

41. ______ is an example of piezoelectric material.
(a)     Glass 
(b)     Quartz
(c)     Corrundum    
(d)     Neoprene
Ans: b

42. _____ is the main constituent of glass
(a)     Fe203 
(b)     Si02
(c)     AI2O3 
(d)     B2O3
Ans: b

43. A good electric contact material should have all of the following properties excePt
(a)    high resistivity
(b)    high resistance to corrosion
(c)    good thermal conductivity
(d)    high melting point
Ans: a

44. Most of the common metals have _____ structure.
(a)     linear 
(b)     hexagonal
(c)     orthorhombic  
(d)     cubic
Ans: d

45. Which of the following affect greatly the resistivity of electrical conductors ?
(a)     Composition   
(b)     Pressure
(c)     Size 
(d)     Temperature
Ans: a

46. Thermonic emission occurs in
(a)     vacuum tubes
(b)     copper conductors
(c)     ferrite cores    
(d)     transistors
Ans: a

47. _____ is a hard solder.
(a)     Tin-lead 
(6)     Tin-silver-lead
(c)    Copper-zinc
(d)    None of the above
Ans: c

48. Addition of 0.3 to 4.5% silicon to iron _____ the electrical resistivity of iron.
(a)     increases 
(b)     decreases
(c)     does not change
Ans: a

49. Super conductivity can be destroyed by
(a)    adding impurities
(b)    reducing temperatures
(c)    application of magnetic field
(d)    any of the above
Ans: c

50.     Non-linear resistors
(a)     produce harmonic distortion
(b)     follows Ohm's law at low tempera¬tures only
(c)    result in non-uniform heating
(d)    none of the above
Ans: a

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