Objective Power Plant Engineering Questions and Answers pdf

71.    Evaporative type of condenser has
(a)     steam in pipes surrounded by water
(b)     water in pipes surrounded by steam
(c)    either (a) or (b)
(d)    none of the above
Ans: a

72.    Pipes carrying steam are generally made up of
(a) steel 
(b) cast iron
(c) copper 
(d) aluminium
Ans: a

73.    For the safety of a steam boiler the number of safety valves fitted are
(a) four 
(b) three
(c) two 
(d) one
Ans: c

74.    Steam turbines commonly used in steam power station are
(a) condensing type
(b) non-condensing type
(c) none of the above
Ans: a

75.    Belt conveyer can be used to transport coal at inclinations upto
(a) 30° 
(b) 60°
(c) 80° 
(d) 90°
Ans: a

76.    The maximum length of a screw conveyer is about
(a) 30 metres 
(b) 40 metres
(c) 60 metres 
(d) 100 metres
Ans: a

77.    The efficiency of a modern boiler using coal and heat recovery equipment is about
(a) 25 to 30% 
(b) 40 to 50%
(c) 65 to 70% 
(d) 85 to 90%
Ans: d

78.    The average ash content in Indian co als is about
(a) 5% 
(b) 10%
(c) 15% 
(d) 20%
Ans: d

79.    Load centre in a power station is
(a)    centre of coal fields
(b)    centre of maximum load of equip-ments
(c)    centre of gravity of electrical system
Ans: c

80.    Steam pressure in a steam power station, which is usually kept now-a-days is of the order of
(a) 20 kgf/cm2 
(b) 50 kgf/cm2
(c) 100 kgf/cm2    
(d) 150 kgf/cm2
Ans: d

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