1. Energy recovery is typically via production of __________
Correct : D. steam
2. Which of the following industrial process uses waste as a fuel?
Correct : A. cement kilns
3. What is the combustion temperature range in cement kiln incineration?
Correct : B. 1350-1650
4. Non-volatile heavy metals in kiln are fixed into __________
Correct : A. clinker’s crystalline structure
5. Which of the following waste types are not suitable for co-combustion in cement kilns?
Correct : A. chlorine
6. . Due to the limits, upper efficiency of steam turbines is fixed to _________
Correct : D. 35-45%
7. How many sections does waste heat recovery boiler have in steam generators?
Correct : C. 3
8. Turbines that are run by exhaust gases are called _______
Correct : A. power recovery turbines
9. Combination of two or more thermodynamic processes gives _________
Correct : B. increase in efficiency
10. By using combined cycle steam and gas power plant _________
Correct : C. specific fuel consumption can be decreased and efficiency increased
11. What are turbo-compound engines?
Correct : A. turbines run at exhausts of otto and diesel cycles
12. The mercury steam cycle represents how many coupled Rankine cycles?
Correct : B. 2
13. In the mercury steam cycle, the mercury cycle is called?
Correct : C. topping cycle
14. In the mercury steam cycle, the steam cycle is called?
Correct : A. bottoming cycle
15. Apart from mercury & steam, which of these is a component of tertiary cycle?
Correct : D. sulphur di-oxide
16. The addition of sulphur dioxide in a tertiary cycle is at?
Correct : B. low temperature
17. Which of these can also be used as a topping fluid?
Correct : A. sodium
18. Which of these can be used as a fluid in the bottoming fluid?
Correct : B. ammonia
19. In case of Sodium-mercury-steam cycle, which is the topping fluid?
Correct : C. sodium
20. In case of mercury-steam-sulphur dioxide cycle, which is the bottoming fluid?
Correct : C. sulphur dioxide
21. The total loss in a tertiary cycle is?
Correct : B. product of losses in the individual cycles
22. Room air conditioners and packaged units are examples of _________
Correct : A. direct expansion systems
23. The process of extraction of the certain required amount of water from air is known as ___________
Correct : D. dehumidification
24. The reciprocal of thermal conductivity is known as __________
Correct : D. thermal resistivity
25. Condensers and evaporators together form a ____________
Correct : B. refrigeration system
26. In traditional Refrigerators in home appliances, what is the type of condenser used?
Correct : A. natural convection type
27. In traditional Air conditioners in home appliances, what is the type of condenser used?
Correct : B. forced convection type
28. In evaporative condensers, ___________ used to extract heat from the condensing refrigerant.
Correct : B. both air and water are
29. Evaporative condensers combine the features of a _____________ in a single unit.
Correct : A. cooling tower and water-cooled condenser
30. Evaporative condensers are used in places where water is _________
Correct : A. scarce
31. What is the meaning of heat rejection ratio (HRR) of a condenser?
Correct : A. ratio of heat rejected to the heat absorbed
32. What is the relation between heat rejection ratio (HRR) and Coefficient of performance (COP)?
Correct : A. hrr = 1 + 1/cop
33. Which type of fins are the most commonly used fin type in condensers?
Correct : B. plate type fins
34. Shell and coil type condensers have a capacity at around ________
Correct : D. 50 tr
35. Double pipe water cooling condensers have a capacity at around ________
Correct : A. 10 tr
36. If there is a decrease in viscosity, the heat transfer coefficient ____________
Correct : A. increase
37. An increase in diameter means a _________ heat transfer coefficient.
Correct : B. smaller
38. why is an analyser-rectifier combination is used in absorption refrigeration cycle?
Correct : C. to eliminate the water vapour from ammonia vapour
39. The vapour going to condenser is ____ in temperature and ____ in ammonia.
Correct : D. lower, richer
40. Water is used as a ____ in air conditioning units.
Correct : B. refrigerant
41. The COP of absorption refrigeration system is
Correct : A. low
42. The wet bulb temperature is the ____ temperature recorded by moistened bulb.
Correct : A. lowest
43. When unsaturated air flows over a sheet of water in an insulated chamber
Correct : A. specific humidity of air decreases
44. When humidity ratio of air ____ air is said to be dehumidified.
Correct : B. decreases
45. Cooling towers are rated in terms of
Correct : C. both of the mentioned
46. A nozzle used to send fluid in coherent stream is called as
Correct : A. jet
47. In fountains the type of nozzle used is
Correct : D. laminar jet
48. The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop
Correct : B. decreases
49. The ratio of the useful heat drop to the isentropic heat drop is called
Correct : B. nozzle efficiency
50. Critical pressure ratio is ratios of pressures at discharge.
Correct : D. maximum
51. The exit velocity in the nozzle increases as per
Correct : B. continuity equation
52. Compressible flow is a flow that deals with
Correct : C. fluid density
53. The coefficient of kinetic friction is less than the coefficient of static friction.
Correct : A. true
54. A cubical block rests on an inclined plane of μ = 1/√3, determine the angle of inclination when the block just slides down the inclined plane?
Correct : C. 30°
55. When a gas is pushed through a pipe, the gaseous molecules are by the pipe’s walls
Correct : C. deflected
56. Gas flows through the nozzle from an area of pressure (called the chamber) to one of pressure
Correct : A. high, low
57. On what basis are fire and water tube boilers are classified?
Correct : D. depending tubular heating surface
58. Stirling boiler is an example of which type of boiler?
Correct : D. water tube boiler
59. Which of these is a stationary boiler?
Correct : D. babcock-wilcox boiler
60. Which of these is a mobile boiler?
Correct : C. locomotive boiler
61. Are boilers defined on the basis of heat source.
Correct : A. yes
62. What is the steam pressure limit of natural circulation boilers?
Correct : B. 180bar
63. Which of the given boilers operate above critical pressure?
Correct : C. once-through boilers
64. Which type of boilers are called drum-less boilers?
Correct : C. positive forced circulation boiler
65. Chances of sediments depositing inside the water tubes in the shell is less due to?
Correct : D. high working pressure
66. Out of the given option choose the advantage that supports fire tube boilers?
Correct : C. water circulation is limited inside boiler shell
67. Tubular air preheater of a boiler is also called as
Correct : A. recuperative air preheater
68. What does regenerative air preheater consists of?
Correct : A. rotor
69. Which fuel is prepared by moulding finely ground coal under pressure?
Correct : C. briquette coal
70. Which fuel has the lightest liquid petroleum fraction?
Correct : B. petrol
71. Which statement about impulse turbine is true?
Correct : B. steam expends completely in stationary nozzels
72. In velocity compounding the steam is expanded from the boiler pressure to condenser pressure in one set of stationary blades on nozzle.
Correct : A. true
73. In condensing turbines vacuum is obtained by
Correct : C. sudden drop in pressure and by removal of non condensable gases
74. Reaction turbine works with the force obtained from change in pressure energy.
Correct : A. true
75. A turbine having alternate blades and nozzles is called as
Correct : A. impulse turbine
76. Compounding efficiency at low speed.
Correct : B. increase
77. In pressure compounded turbines moving nozzles are followed by turbine blades.
Correct : B. false
78. In pressure compounded turbines flow passage is from
Correct : B. fixed nozzles to moving blades
79. A plant producing both, electrical power & process heat simultaneously is?
Correct : C. cogeneration plant
80. In a by-product power cycle?
Correct : C. power production is after the cycle has ended
81. In terms of cost per MW compared to condensing sets of the same power, the back pressure turbines are?
Correct : B. cheaper
82. Which of the following is a good medium for constant temperature heating?
Correct : B. steam
83. The cogeneration plant efficiency nCO if WT, Qi, QH represents turbine work, heat input, heat output respectively is given by?
Correct : D. nco = (wt + qh) / qi
84. If e is the electricity fraction of the total energy output, m is the electric plant efficiency and n is the steam generator efficiency; the heat added per unit total energy output is given by?
Correct : A. (1 / m) + ((1 – e) / n)
85. Which of these is not considered economical for cogeneration?
Correct : B. a low fraction of electric to total energy
86. The energy transfer between the hot fluid and cold fluids is brought about by their complete physical mixing in
Correct : A. direct contact heat exchanger
87. In vapour refrigeration cycle, which of the following is used for expansion?
Correct : B. throttling valve or capillary tube
88. Wet compression is preferred over dry compression.
Correct : B. false
89. One tonne of refrigeration is given as the rate of heat removal from surroundings equivalent to heat required for melting one tonne of ice in a day.
Correct : A. true
90. Superheating of vapour and subcooling of liquid the refrigerating effect.
Correct : B. increases
91. A condenser must and then the compressed refrigerant.
Correct : D. desuperheat, condense
92. The vapour going to condenser is in temperature and in ammonia.
Correct : D. lower, richer
93. Water is used as a in air conditioning units.
Correct : B. refrigerant
94. Which of the following types of filters used in the air conditioning system is made of cloth that is discarded on getting dirty?
Correct : B. dry filter
95. Select the disadvantage of cooling pond out of the given?
Correct : C. there is no control over the temperature of cooled water
96. How is water circulated throughout the dry cooling tower system?