3. The function of a receiver in compressor installations is
Correct : B. To dempen pulsations or pressure waves incompressor discharge
4. In an analysis report of a sample of coal, the percentage of one of the constituents is specified as 2.5%. This constituent could be
Correct : D. Sulphur
5. Apart from reducing friction and cooling the surfaces, the function of lubricant in I.C. engines is
Correct : B. To clean the surfaces by carrying away the carbon and metal particles cansed by wear
6. During throttle governing of steam engines
Correct : C. Thermal efficiency of the engine reduces
7. The efficiency of jet engine is higher at
Correct : B. Higher altitude
8. In a compression ignition engine the fuel consumption will increase if the back (exhaust) pressure is
Correct : B. Increased
9. If petrol is supplied to a diesel engine
Correct : D. The engine will run with high knocking
10. A sample of water having pH value of 7 is
Correct : C. Neutral
11. Which of the following has the lowest pressure in a petrol engine?
Correct : D. Mixture at the end of suction stroke
12. The discharge of hydrocarbons from an automobile exhaust is minimum when the vehicle is
Correct : E. Idling
13. Load curve is the plot of
Correct : C. Load versus time
14. With reference to a safety valve the blow down pressure is the pressure at which
Correct : B. Valve closes after opening
15. A four wheel drive automobile has
Correct : E. Two differentials
16. The work done in compressing 1 kg of air in compression will be least when the value of index is
Correct : B. 1
17. Separators are generally used in air compressor installations
Correct : A. Between after cooler and receiver
18. For the same maximum pressure and heat input, the most efficient cycle is
Correct : C. Brayton
19. In compression ignition engines swirl is
Correct : B. Circular motion imparted to suction air
20. Which of the following acts as a step up transformer in the ignition circuit of a petrol engine?
Correct : A. Battery
21. Tidal power is the power generated from
Correct : C. Rise and fall tides
22. Percentage improvement in power in case of a four stroke diesel engine with the help of a supercharger may be expected in the range
Correct : C. 75
23. Thermal efficiency of a spark ignition engine at full load usually is in the range
Correct : A. 30 to 35 percent
24. A Lungistrom turbine is
Correct : C. Outward radial flow turbine
25. Diesel engine has air fuel ratio of 30 ; 1 during idling. A petrol engine can also work on such mixture provided
Correct : C. Dannot run as it is impossible
26. The amount of exhaust gases in clearance space left after exhaust stroke, varies with
Correct : D. Speed and load of the engine
27. Out of the following diesel engine the minimum air consumption per B.H.P. will be in
Correct : E. 4 stroke, mech, injection
28. Enthalpy of a substance is defined as
Correct : C. Total heat content of substance above zero degree centigrade
29. Endurance test for I.C. engines is conducted for
Correct : C. 500 hours
30. A system having connected load of 100 kW, peak load of 80 kW, base load of 20 kW and average load of 40 kW will have a load factor of
Correct : E. 50%
31. The value of reheat factor in case of steam turbines is usually
Correct : B. 1.02 to 1.06
32. A fuel of octane rating 85 matches the antiknock qualities of mixture consisting of
Correct : B. 85% octane + 15% heptane
33. A Wankel engine combines the advantages of
Correct : D. Rotory and reciprocating engines
34. Willian's line is relevant to
Correct : A. Throttle controlled trbine
35. Starting motor in automobiles is generally
Correct : E. Series motor
36. Three states of matter are distinguished with repect to molecules by
Correct : A. Characteristics of the motion of molecules
37. Tenacity is the property of materials in which they
Correct : B. Resist rupture
38. The horse power of engine for a ship is of the order to
Correct : A. 10,000 to 40,000
39. As the steam flows in a subsonic nozzle, in which the cross-section is decreasing in the direction of flow
Correct : D. The velocity will increase while pressure will decrease in the direction of flow
40. White smoke from a diesel engine can be expected during
Correct : A. Start up or idling
41. Total sulphur content in a diesel fuel oil must not exceed
Correct : D. 0.50%
42. Air consumption of a four-stroke diesel engine per rated BHP/hr will be
Correct : C. 5 - 7 kg
43. In spark ignition engines the knocking tendency decreases
Correct : A. As compression ratio is reduced
44. Water and sediments in a diesel fuel oil must not exceed.
Correct : E. 0.05%
45. Rankine cycle efficiency for fixed steam temperature of any volume upto critical temperature will be maximum for steam pressure of
Correct : D. Critical pressure
46. A certain gas occupies 2 cu-m at a temperature of 400?C. It receives heat at constant pressure till its temperature is doubled. The change in volume would be
Correct : E. 3.188 cu-m
47. If the power factor of an electrical system is unity, it means
Correct : C. Entire power pulls the load
48. A fixed quantity of heat is to be added to a system under specific conditions. The process in which the entropy change will be maximum is
Correct : C. Constant temperature process
49. Air standard efficiency of an I.C. engine depends on
Correct : A. Compression ratio
50. Which of the following is false statement?
Correct : D. Fuel consumption increases if lean mixture is supplied
51. Which of the boiler provides superheated steam?
Correct : A. Locomotive boiler
52. Which of the following particles will be smallest in size?
Correct : C. Smog
53. Dew point temperature is an indication of
Correct : D. Lowest temperature where air and water vapour start separating
54. High air-fuel ratio in gas turbines
Correct : A. Reduces the exhaust temperature
55. If a steam injector fails to lift the water the trouble may not be due to
Correct : C. Water supply to cold
56. Working in the cryogenic range means dealing with temperatures
Correct : C. Between - 190?C and absolute zero
57. The sulphur content in diesel oil should not exceed
Correct : D. 1%
58. Which of the following will not be seen in a boiler using pulverised fuel?
Correct : A. Chain in great stoker
59. The governor for steam turbine is driven by
Correct : A. Main shaft
60. Air preheater in a boiler will be invariably located between
Correct : E. Forced draft fan and furnace
61. A run-of-river hydro-electric station is one which is
Correct : C. Located on a steam flow without water storage
62. After cooler is used to
Correct : A. Cool the air
63. Brayton cycle cannot be used in reciprocating engines even for same compression rations and work output because
Correct : A. Large volume at low pressure cannot be efficiently harded in reciprocating engines
64. A sample having pH value of 5 will be
Correct : B. Acidic
65. The mean effective pressure of a diesel cycle having fixed compression ratio will increase if cut off ratio will
Correct : A. Increase
66. Thermal efficiency of C.I. engines on weak mixtures is
Correct : A. Higher
67. In order to achieve maximum possible fuel economy the design features which will be affected are
Correct : D. Atomization
68. A negative loop in the P-V diagram of a petrol engine is due to
Correct : D. early opening of exnaust valve
69. A compound pressure gauge measures
Correct : B. Positive and negative pressures
70. A barN is
Correct : A. A unit of area
71. In isothermal compression
Correct : A. There is no gain internal energy
72. In Parsons reaction turbine
Correct : A. The fixed and moving blades are identical
73. For combustion of one kg of carbon the quantity of oxygen required (air contains 23% by wight of oxygen) is
Correct : C. 2.62 kg
74. If a engine working on Otto cycle has its compression ratio raised from 5 to 6 the percentage increase in air standard efficiency will be
Correct : A. 4%
75. For spark ignition engines fuel in order of decreasing knock tendency are
Correct : B. Paraffins, naphthenes, armatics
76. Which of the following can have octane rating of more than 100?
Correct : D. Benzol
77. Normally the colour of exhaust from a diesel engine is
Correct : D. Black
78. For initially dry and saturated steam flowing through a nozzle the volue of critical pressure ratio is given by
Correct : A. 0.577
79. Which of the following type of internal combustion engines uses rocker arms?
Correct : C. Overhead valve engines
80. In naturally aspirated engine the pressure inside cylinder at the end of suction stroke is
Correct : A. Less than atmospheric
81. The ash content in diesel oil should not exceed
Correct : D. 0.01%
82. A hot short metal is
Correct : A. Brittle when heated
83. In a SI engine the advancing of spark timing will
Correct : A. Increase knocking tendency
84. Of the calorific value ranges given below which one is generally for coal?
Correct : C. 4000 - 7000 kcal/kg
85. The function of a piston rins in an internal combustion engine is
Correct : D. All of the above
86. Zeroth law of thermodynamics states that
Correct : C. If two systems are in thermal equilibrium with a third system, then they are in equilibrium with each other
87. For the same peak pressure and heat input
Correct : B. Diesel cycle is more efficient
88. In a jet propulsion unit the products of combustion after passing through the gas turbine are discharged into
Correct : E. Discharge nozzle
89. A D-slide valve is used in
Correct : D. Steam engines
90. The Clapeyron equation is applicable for
Correct : C. Change of state when two phases are in equilibrium
91. Speed drop is the
Correct : C. Reduction in engine speed from no loads to full load
92. For reciprocating air compressor the law of compression desired is isothermal and that may be possible by
Correct : B. very low speeds
93. In a surface condenser near to the air pump suction the vacuum is 500 mm of mercury with 730 mm of mercury height in a barometer. The pressure near the air pump suction would be
Correct : A. 0.69 kg/sq-cm
94. Which of the following fuel can be obtained by fermentation of vegetable matter?
Correct : A. Alcohol
95. If performance of SI engines of different manufacture having different capacities, sizes and systems are to be compared the common parameter would be
Correct : E. Mean effective pressure
96. Which of the following is not a part of diesel engine?
Correct : D. Condenser
97. Compression ratio for spark ignition engines varies in the range
Correct : A. 6 to 12
98. If a heat engine given an output of 3.5 kW and input is 10000 Joules per second, the thermal efficiency of the engine will be
Correct : B. 35%
99. Inlet valve of a IC engine remains open for
Correct : B. 250?
100. The capacity of an automobile battery is expressed in terms of