16. Critical pressure ratio is ratios of pressures at discharge.
Correct : D. maximum
17. Ratio of critical pressure to inlet pressure in known as
Correct : C. critical pressure ratio
18. In De Laval Nozzle critical pressure ratio is given by (2/y+1)^(y/y-1).
Correct : A. true
19. With the increase in pressure, the exit velocity
Correct : A. decreases
20. The Prandtl Number approximates
Correct : A. momentum diffusivity to thermal diffusivity
21. Pumps increase
Correct : A. pressure
22. Which among the following is the formula for volumetric flow rate?
Correct : B. q = av
23. Which among the following is the formula for mass flow rate?
Correct : B. q = mp
24. Compressible flow mainly deals with
Correct : C. gas dynamics
25. Which among the following is an assumption of the compressible flow?
Correct : B. no-slip condition
26. What is Mach number?
Correct : B. speed of object /speed of sound
27. Which of the following kinetic friction is smaller?
Correct : C. rolling friction
28. A mass of 4kg rests on a horizontal plane. The plane is gradually inclined until at an angle θ= 15° with the horizontal, the mass just begins to slide. What is the coefficient of static friction between the block and the surface?
Correct : B. 0.27
29. A scooter weighs 120kg f. Brakes are applied so that wheels stop rolling and start skidding. Find the force of friction if the coefficient of friction is 0.4.
Correct : B. 48kg f
30. How is friction due to air reduced?
Correct : A. streamlining
31. Friction can be increased by
Correct : C. using sand
32. When moving along a curved path, he
Correct : A. leans inwards
33. A train has to negotiate a curve of radius 400m. By how much should the putter rail be raised with respect to inner rail for speed of 48 km/h? The distance between the rails is 1m.
Correct : B. 0.0454m
34. When a gas is pushed through a pipe, the gaseous molecules are by the pipe’s walls
Correct : C. deflected
35. In fluid dynamics, the velocity of the fluid in the stagnation point is
Correct : A. zero
36. If the speed of sound is much than that of the gas, the gas density will stay constant.
Correct : B. larger
37. Isentropic nozzle flow states about the movement of a gas or fluid through a narrow orifice without an increase or decrease in
Correct : B. decelerating
38. To refrain from separation in subsonic nozzles, the expansion angle must not be more than
Correct : A. 10 degrees
39. Gas flows through the nozzle from an area of pressure (called the chamber) to one of pressure
Correct : A. high, low
40. Converging-diverging nozzle is also known as
Correct : D. de laval’ nozzle
41. When the pressure chamber is big, the flow velocities are
Correct : B. negligible
42. For a compressible, ideal gas, mass flow rate depends on parameters such as flow area, pressure, temperature, properties of the gas, and
Correct : B. mach number
43. Which type of boilers use orifice to control the flow circulation?
Correct : B. forced convection boilers
44. What is the advantage of having smaller ratio of water to steam space?
Correct : A. steam can be generated at a faster even if the boiler is cold
45. Which are the major types of boilers that are operated in world today?
Correct : D. once through boiler
46. How many level indicators are there in the water level indicator of a boiler?
Correct : B. 2
47. What is the function of pressure gauge in the boiler?
Correct : A. to indicate steam pressure
48. other than Steam stop valve in the boiler which is the other similar type of valve used?
Correct : D. junction valve
49. What is the function of Blow down valve of a boiler?
Correct : A. to remove sludge
50. What is the function of fusible plug in the boiler?
Correct : A. protect the fire tube
51. What is the function of safety valves in the boiler?
Correct : A. to prevent excessive steam pressure
52. How many types of safety valves are used in boiler in practice?
Correct : B. 2
53. What happens due to high temperature of feeds water in the economizer?
Correct : C. fuel consumption decreases
54. What is the function of superheater in the boiler?
Correct : A. increase the temperature of steam
55. What is the function Air heater in the boiler?
Correct : B. recover the heat from flue gas
56. What is the function of the feed water pump of a boiler?
Correct : A. pump water at high pressure
57. Rotary pumps are driven by
Correct : A. electric motors
58. Which fuel is prepared by heating bituminous coal continuously for 15 to 18 hours in closed chamber?
Correct : C. coke
59. Which fuel is produced by powdering low grade coal with high ash content?
Correct : B. pulverized coal
60. Which is the correct advantage of solid fuels out of the given option?
Correct : A. they have low ignition temperature
61. Choose the proper disadvantage of solid fuels out of the given option?
Correct : A. they produce lot of smoke
62. In what forms are liquid fuels available in nature?
Correct : D. crude petroleum
63. Name the process used to eliminate impurities present in crude oil?
Correct : A. distillation
64. Which fuel is heavier than petrol but less volatile and it is commonly used as domestic fuel?
Correct : C. kerosene
65. Which fuel is slightly heavier than kerosene and is produced in petroleum fractions?
Correct : D. distillate
66. Which fuel has higher thermodynamic efficiency in liquid fuels?
Correct : A. diesel
67. Which liquid fuel has a wider composition than diesel and used in furnaces of oil fired boiler?
Correct : A. fuel oil
68. Which is the artificial liquid fuel obtained by fermentation process?
Correct : B. alcohol
69. Which among the following fuels need excess amount of air for complete combustion?
Correct : D. artificial solid fuels
70. Which of the following is not a type of steam turbine?
Correct : C. pelton wheel turbine
71. Majority of the turbines are axial flow type.
Correct : A. true
72. Which turbines are employed for driving alternator at synchronous speed?
Correct : A. central station turbine
73. Non Condensing steam turbine can also be called as
Correct : B. back pressure steam turbine
74. Steam turbine is classified on basis of
Correct : D. all of the mentioned
75. High pressure turbine is a Non-Condensing turbine due to
Correct : A. exhaust conditions
76. Impulse blades are in the shape of
Correct : C. half moon
77. Astern turbines are used in
Correct : B. marine purposes
78. Cross compound steam turbines are once used in
Correct : B. marine ships
79. When steam reaches turbine blades the type of force responsible for moving turbine blades are
Correct : A. axial force
80. Multi stage arrangement of turbines is called as
Correct : C. compounding
81. Compounding efficiency at low speed.
Correct : B. increase
82. In velocity compounded turbines flow passage is from
Correct : D. none of the mentioned
83. A velocity compounded impulse turbine is also called as
Correct : A. curtis wheel
84. Reaction turbine is also called as
Correct : C. parsons turbine
85. A turbine comprising of fixed blades and moving nozzles is called as reaction turbines.
Correct : A. true
86. Which of these is not an application of back pressure turbine?
Correct : B. filtration of water
87. Pass-out turbines are used in which of these cases?
Correct : D. both relatively high back pressure and small heating requirement
88. Heat exchangers are classified into how many categories?
Correct : D. 4
89. Based upon the nature of heat exchange process, the heat exchangers are classified into how many categories
Correct : C. 3
90. Which type of flow arrangement is this?
Correct : B. parallel flow
91. Which of the following is not an example of recuperators type heat exchanger?
Correct : C. chemical factories
92. In how many categories heat exchangers are classified on the basis of direction of flow of fluids?
Correct : B. 3 categories
93. In how many categories heat exchangers are classified on the basis of physical state of heat exchanging fluids?
Correct : B. 2
94. Which of the following operations occur in a vapour refrigeration cycle?
Correct : D. all of the mentioned
95. Compression can be
Correct : C. both of the mentioned
96. Wet compression is preferred over dry compression.
Correct : B. false
97. Why is wet compression not preferred?
Correct : D. all of the mentioned
98. The expansion process is
Correct : C. adiabatic
99. The evaporation process is a
Correct : B. constant pressure reversible process
100. The evaporator produces the cooling or refrigerating effect.