51. Orsat meter is used for
(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.
Ans: b
52. Alkaline pyrogallate is used in Orsat’s apparatus for absorption of
(a) C02
(b) CO
(c) 02
(d) N2
(e) none of the above.
Ans: c
53. An ideal regenerative cycle is
(a) equal to carnot cycle
(b) less than carnot cycle
(c) more than carnot cycle
(d) could be anything
(e) none of the above.
Ans: b
54. Efficiency of rankine cycle can be increased by
(a) decreasing initial steam pressure and temperature
(b) increasing exhaust pressure
(c) decreasing exhaust pressure
(d) increasing the expansion ratio
(e) increasing number of regenerative heaters.
Ans: a
55. Cochran boiler is a
(a) horizontal fire-tube boiler
(b) horizontal water-tube boiler
(c) veritcal water-tube boiler
(d) vertical fire tube boiler
(e) forced circulating boiler.
Ans: d
56. Lancashire boiler is a
(a) stationary fire tube boiler
(b) stationary water tube boiler
(c) water tube boiler with natural/forced circulation
(d) mobile fire tube boiler
(e) none of the above.
Ans: a
57. Efficiency of a thermal cycle increases by
(a) regeneration
(b) reheating of steam
(c) both (a) and (b)
(d) cooling of steam
(e) none of the above.
Ans: c
58. One kilowatt-hour energy is equivalent to
(a) 1000 J
(b) 360 kJ
(c) 3600 kJ
(d) 3600 kW/sec
(e) 1000 kJ.
Ans: c
59. Which of the following gases has the highest calorific value
(a) producer gas
(b) coal gas.
(c) water gas
(d) blast furnace gas
(e) coke oven gas.
Ans: b
60. 100% efficiency of a thermal cycle cannot be achieved because of
(a) frictional losses
(b) it is not possible to achieve 0°K temperature
(c) leakage
(d) non-availability of ideal substance
(e) none of the above.
Ans: b
61. For burning 1 kg of carbon to CO as per chemically correct combustion, amount of air required is
(a) 1 kg
(b) 4/3kg
(c) 8/3kg
(d) 2 kg
(e) 16/3 kg.
Ans: b
62. The diameter of Cornish boiler is of the order of
(a) 1-2 m
(b) 1.5-2.5 m
(c) 2-3 m
(d) 2.5-3.5 m
(e) 0.5 to 1 m
Ans: a
63. The length of Cornish boiler is of the order of
(a) 2-4 m
(b) 3-5 m
(c) 5-7.5 m
(d) 7-9 m
(e) 9-11 m
Ans: c
64. The diameter of fire tube of Cornish boiler compared to its shell is
(a) one half
(b) one third
(c) one-fifth
(d) two-fifth
(e) three-fifth
Ans: a
65. Steam engine operates on
(a) carnot cycle
(b) joule cycle
(c) Stirling cycle
(d) brayton cycle
(e) none of the above.
Ans: d
66. The change in internal energy in steam engines equals to
(a) work done during the rankine cycle ;
(b) work done during compression.
(c) work done during adiabatic expansion
(d) change in enthalpy
(e) none of the above.
Ans: a
67. Water tube boilers are those in which
(a) flue gases pass through tubes and water around it
(b) water passes through the tubes and flue gases around it
(c) work is done during adiabatic expansion
(d) change in enthalpy
(e) none of the above.
Ans: c
68. Locomotive type boiler is
(a) horizontal multitubular water tube boiler
(b) water wall enclosed furnace type
(c) vertical tubular fire tube type
(d) horizontal multi-tubular fire tube type
(e) none of the above types.
Ans: d
69. Lancashire boiler is of
(a) stationary (b) horizontal type
(c) natural circulation type
(d) internally fired type
(e) all of the above.
Ans: e
70. Fire tube boilers are those in which
(a) flue gases pass through tubes and water around it
(b) water passes through the tubes and flue gases around it
(c) forced circulation takes place
(d) tubes are laid vertically
(e) none of the above.
Ans: a
71. Which of the following substance will have same percentage in both proximate and ultimate analysis
(a) ash
(b) volatile matter
(c) moisture
(d) hydrogen
(e) none of the above.
Ans: a
72. The number of flue tubes in Lancashire boiler is
(a) zero
(b) one
(c) two
(d) four
(e) many
Ans: c
73. Which of the following is a fire tube boiler
(a) locomotive boiler
(b) Babcock and Wilcox boiler
(c) Stirling boiler.
(d) all of the above
(e) none of the above.
Ans: a
74. Which of the following is a water tube boiler
(a) locomotive boiler
(b) Cochran boiler
(c) Cornish boiler
(d) Babcock and Wilcox boiler
(e) Lancashire boiler.
Ans: d
75. The diameter of cylindrical shell of the Lancashire boiler is of the order of
(a) 1 tp 1.25m
(b) 1 to 1.75 m
(c) 2 to 4 m
(d) 1.75 to 2.75 m
(e) 2.25 to 4.5 m.
Ans: d