steam boilers engines nozzles and turbines MCQs – Page 2

Practise focused steam boilers engines nozzles and turbines questions with marked answers for exam preparation and subject revision.

steam boilers engines nozzles and turbines Mcqs
51. Which of the following boilers is best suited to meet fluctuating demands___________________?
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A. cochran

B. lancashire

C. locomotive

D. babcock and wilcox

E. comish

52. Equivalent evaporation of water is the evaporation for a feed water supply at 100C__________________?
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A. and its corresponding conversion into dry steam at desired boiler pressure

B. and its corresponding conversion into dry saturated steam at 100C and 1.033 kg/cm2

C. conversion into steam at the same pres-sure at which feed water is supplied

D. conversion into steam at atmospheric condition

E. none of the above

53. Locomotive type boiler is__________________?
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A. water wall enclosed furnace type

B. horizontal multi-tubular fire tube type

C. vertical tubular fire tube type

D. none of the above types

E. horizontal multitubular water tube boiler

54. Steam engine operates on_________________?
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A. Stirling cycle

B. brayton cycle

C. carnot cycle

D. joule cycle

E. none of the above

55. One kilowatt-hour energy is equivalent to ________________?
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A. 1000 J

B. 3600 kW/sec

C. 3600 kJ

D. 360 kJ

E. 1000 kJ

56. The critical pressure at which latent heat of vaporisation is zero is________________?
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A. 1 kgf/cm2

B. 1 kgf/cm2

C. 100 kgf/cm2

D. 273 kgf/cm2

E. 225.65 kgf/cm2
57. The diameter of cylindrical shell of the Lancashire boiler is of the order of__________________?
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A. 1.75 to 2.75 m

B. 2.25 to 4.5 m

C. 2 to 4 m

D. 1 to 1.75 m

E. 1 tp 1.25m

58. The lenght of Cornish boiler is of the order of _________________?
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A. 5-7.5 m

B. 3-5 m

C. 7-9 m

D. 2-4 m

E. 9-11 m

59. Duplex feed pumps are used in small steam boilers. These operate on the principle of_________________?
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A. axial flow pump

B. gear pump

C. reciprocating pump

D. ejector pump

E. centrifugal pump

60. In natural circulation type boiler _______________?
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A. feed pump is employed to supplement natural circulation in water wall type furnace

B. water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture of water and steam

C. water is fed at atmospheric pressure

D. water is converted into steam in one . pass without any recirculation

E. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
61. Which of the following coals has the highest calorific value_________________?
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A. wood

B. anthracite coal

C. lignite

D. peat

E. bituminous coal

62. Hygrometery deals with the_________________?
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A. density measurement

B. pressure of air

C. temperature of air

D. water vapour in air

E. Hygroscopic substances

63. The diameter of internal flue tubes in a Lancashire boiler compared to its shell is_________________?
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A. one-half

B. one-fourth

C. one-third

D. two-fifth

E. one-fifth

64. If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Daltons law, the pressure in condenser is equal to__________________?
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A. Pa+P

B. Ps-Pa

C. pa-ps

D. non of these

65. The evaporation of 15.653 kg of water per hour from and at 100C is called_________________?
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A. evaporative capacity

B. equivalent evaporation

C. factor of evaporation

D. one boiler h.p.

E. boiler efficiency

66. A wet vapour can be completely specified by__________________?
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A. pressure only

B. specific volume only

C. dryness fraction only

D. temperature only

E. pressure and dryness fraction
67. Adiabatic process is________________?
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A. constant enthalpy process

B. reversible process

C. non-heat transfer process

D. essentially an isentropic process

E. constant temperature process

68. The number of flue tubes in Lancashire boiler is_________________?
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A. two

B. one

C. many

D. zero

E. four

69. Cochran boiler is a__________________?
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A. horizontal water-tube boiler

B. forced circulating boiler

C. horizontal fire-tube boiler

D. vertical fire tube boiler

E. veritcal water-tube boiler

70. Water tube boilers are those in which________________?
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A. none of the above

B. change in enthalpy

C. water passes through the tubes and flue gases around it

D. flue gases pass through tubes and water around it

E. work is done during adiabatic expansion
71. One kg of steam sample contains 0.8 kg dry steam; its dryness fraction is__________________?
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A. 0.8

B. 0.2

C. 0.6

D. 1

E. 0.5

72. Which of the following is a fire tube boiler________________?
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A. all of the above

B. Babcock and Wilcox boiler

C. locomotive boiler

D. none of the above

E. Stirling boiler.

73. At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?
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A. minimum

B. none of the above

C. zero

D. depends on temperature also

E. maximum

74. 1 kg.m is equal to_________________?
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A. All Joules

B. 102 Joules

C. 9.81 Joules

D. 427 Joules

E. 539 Joules

75. Locomotive boiler is of the following type__________________?
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A. horizontal

B. internally fired

C. multitubular

D. all of the above

E. mobile

76. An ideal regenerative cycle is ______________________?
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A. more than carnot cycle

B. less than carnot cycle

C. could be anything

D. none of the above

E. equal to carnot cycle

77. The equivalent evaporation of a boiler is a measure to compare _________________?
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A. the given boiler with the model

B. the two different boilers of the same make

C. two boilers of same make but operaing under different conditions

D. any type of boilers operating under any conditions

E. two different makes of boilers operating under the same operating conditions

78. The change in internal energy in steam engines equals to__________________?
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A. work done during the rankine cycle ;

B. work done during adiabatic expansion

C. change in enthalpy

D. work done during compression.

E. none of the above

79. Orsat meter is used for__________________?
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A. gravimetric analysis of the flue gases

B. volumetric analysis of the flue gases

C. mass flow of the flue gases

D. measuring smoke density of flue gases

E. none of the above

80. Pick up the wrong statement about critical condition of steam___________________?
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A. all properties of liquid and steam are same

B. specific volume of steam and liquid is same

C. latent heat is zero

D. liquid directly becomes steam

E. this is the maximum pressure limit
81. The crown of the fire box is made hemispherical in order to___________________?
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A. withstand pressure inside boiler ,

B. enable easy,manufacture

C. give maximum space

D. resist intense heat in fire box

E. give maximum strength

82. Alkaline pyrogallate is used in Orsats apparatus for absorption of _________________?
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A. 02

B. N2

C. C02

D. none of the above

E. CO

83. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?
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A. more

B. equal

C. less

D. may be less or more depending on temperature

E. unpredictable

84. The state of vapour under saturation condition is described by_______________?
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A. dryness fraction alone

B. pressure alone

C. temperature alone

D. pressure and temperature

E. pressure and dryness fraction
85. Heating of dry steam above saturation temperature is known as_____________________?
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A. enthalpy

B. latent heat

C. superheating

D. supersaturation

E. super tempering

86. Fire tube boilers are those in which__________________?
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A. tubes are laid vertically

B. water passes through the tubes and flue gases around it

C. none of the above

D. forced circulation takes place

E. flue gases pass through tubes and water around it
87. Lancashire boiler is of____________________?
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A. all of the above

B. stationary<fire tube-type

C. natural cirulation type

D. horizontal type

E. internally fired type

88. In accelerated circulation type boiler________________?
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A. water is converted into steam in one pass without any recirculation

B. feed pump is employed to supplement natural circulation in water wall type furnace

C. water is supplied in drum and through downcomers located in atmospheric conditon it passes to the water wall and rises to durm in the from of mixture of water and steam

D. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of stdam bubbles and hot water which rise to durm

E. water is fed under high pressure and high velocity

89. Water and sediment in fuel oil can be removed by _______________________?
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A. cooling the oil in the settling tanks

B. burning the oil

C. heating the oil in the settling tanks

D. suspension

E. filtering

90. Which type of boiler can meet rapid changes of load____________________?
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A. vertical fire tube type

B. forced circulation type

C. horizontal fire tube type

D. horizontal water tube type

E. vertical water tube type

91. The balanced draft furnace is one using _________________________?
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A. induced draft fan and forced draft fan

B. any one of the above

C. none of the above

D. forced draft fan and chimney

E. induced draft fan and chimney

92. Boiler parameters are expressed by ___________________?
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A. all of the above

B. none of the above

C. temperature of steam in C

D. tonnes/hr. of steam

E. pressure of steam in kg/cm2

93. With increase in load, radiant super heater has____________________?
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A. flat characteristic

B. lihear characterisstic

C. none of the above

D. drooping characteristic

E. rising characteristic

94. A safety valve in a locomotive starts leaking. The leaking medium will be_________________?
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A. water

B. dry steam

C. supersaturated steam

D. wet steam

E. super heated steam
95. It is required to produce large amount of steam at low pressure. Which boiler should be used ?
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A. lancashire boiler

B. babcock and wilcox boiler

C. cochran boiler

D. stoker fired boiler

E. pulverised fuel fired boiler

96. The feed check valve is used in order to ______________________?
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A. check level of water in boiler drum

B. allow high pressure feed water to flow to drum and not allow reverse flow to take place

C. recirculate unwanted feed water

D. none of the above

E. regulate flow of boiler water

97. In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine__________________?
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A. locomotive boiler

B. babcock and wilcox boiler

C. benson boiler

D. cochran boiler

E. lancashire boiler

98. In a recuperative air preheater, the heat is transferred____________________?
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A. heat is transferred by bleeding some gases from furnace

B. from heating an itermediate material and then heating the air from this material

C. from a metal wall from one medium to another

D. none of the above

E. by direct mixing ,

99. The pressure at which latent heat of vaporisation of water is zero, is_________________?
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A. 1 kg/cm2

B. 100 kg/cm2

C. 170 kg/cm2

D. 225.6 kg/cm2

E. below atmospheric pressure

100. Pick up wrong statement about desired properties of a good fuel__________________?
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A. high calorific value

B. ecomomical

C. ease in storing

D. high ignition point

E. produce minimum smoke and gases