1. The self-ignition temperature of diesel oil as compared to petrol is
Correct : A. Higher
2. Rank of coal is based on
Correct : A. Fixed carbon and heating value
3. Piston rings are made of
Correct : E. Cast iron
4. This purpose of supercharging an engine is
Correct : A. To increase the power output of engine
5. The lowest temperatures that can be measured by a gas thermometer using nitrogen is
Correct : C. ? 200?C
6. Gusset stays are provided in
Correct : D. Boilers
7. One kg of octane is burnt by four alternative processes given below. In which case the work available will be maximum?
Correct : D. When burnt in a reversible process
8. For superheated steam in a nozzle the critical pressure ratio is
Correct : B. 0.546
9. Dark, black smoke from diesel engines usually results when the engine is
Correct : D. Running at full load and full speed
10. A starting motor should have capacity to generate power equal to
Correct : D. Friction horse power at cranking r.p.m
11. Water gas is a mixture of
Correct : B. CO and H2
12. A jet engine has
Correct : D. No propeller
13. A Lenoir cycle has a top temperature in the cycle
Correct : D. Between Otto and diesel cycles
14. In isochronous governors the speed drop is
Correct : E. Zero
15. In a Diesel engine the duration between the time of injection and time of ignition is called
Correct : B. Delay period
16. All but one of the following possible steam generator test difficulties would cause the apparent performance to be poorer than it actually is. One item would make the performance look better than it really is. Identify the item
Correct : D. Coad scales are inaccurate, reading high
17. Resilience is the property of materials in which
Correct : B. Materials spring back or recoil when pressure is removed
18. Thermie
Correct : A. Is quantity of heat required to raise temperature of one tonne of water from 14.5?C to 15.5?C
19. Induced draft fan for a boiler is always located
Correct : B. At the foot of the chimney
20. Intercooling in multistage compressors is done
Correct : E. To minimise the work of compression
21. Which of the following is an important consideration in the design of turbine blades?
Correct : A. Creep
22. Sensible heat is
Correct : C. That heat which produces a rise of temperature
23. The effieincy of a diesel cycle increases with
Correct : B. decrease in cut off
24. In a throttle governed steam engine
Correct : D. Admission pressure is varied while cut off remains unaltered
25. For gas turbines compressors used are
Correct : C. Axial flow type
26. How many kg of air will contain one kg of oxygen?
Correct : C. 4.35 kg
27. Vapour lock is
Correct : B. Serious restriction to the supply of fuel due to excessively rapid formation of vapour in S.I. engine
28. Which of the following part is not common between a steam engine and a petrol engine?
Correct : D. Muffler
29. The efficiency of a jet engine is higher at
Correct : A. Higher altitudes
30. Which of the following is a false stagement: The cause of excessive engine vibrations especially at high speeds in spark ignition engines is
Correct : A. Unequal distribution of mixture
31. In regenerative feed heating system the steam 'bled' from turbine exchanges heat with
Correct : D. Feed water for boiler
32. In thermodynamics spontaneous processes are those
Correct : C. Which occur in the direction of an intensive property or driving force contained within the system
33. Which one of the following is not a constituent of coal
Correct : B. Manganese
34. The gas used for cooling the conductors of large generators is
Correct : E. Hydrogen
35. During preliminary test run of an engine for 7 hours cycles if the engine stops after operating for 5 hours then
Correct : B. The engine is again run for 7 hours
36. Prony brake is used for testing of
Correct : C. Small engines
37. The missing quantity in a steam engine can be reduced by all of the following methods EXCEPT
Correct : C. Reducing the speed of the engine
38. In the Bomb calorimeter the fuel to be tested is burned
Correct : C. At constant volume
39. The maximum horse power of a 150 CC scooter engine is around
Correct : D. 8
40. Boilers using Bagasse as fuel use
Correct : E. Spreader stokers
41. The enthalpy of vaporisation is minimum at
Correct : B. Critical temperature
42. Which part of a gas turbine is subjected to the highest temperature?
Correct : A. Blades
43. In case of glass tube type water level indicator for a boiler
Correct : A. One end of the tube is connected to water space and the other is connected to steam space in the drum
44. Baffles are provided on engines to
Correct : B. Improve heat transfers rate
45. A rope brake dynamometer falls under the category of
Correct : C. Mechanical friction type dynamometer
46. Live storage of fuel means
Correct : A. Fuel stored to meet day's requirement for the boiler
47. In closed cooling system
Correct : A. Hot water is recirculated after cooling
48. In a four stroke petrol engine
Correct : B. Intake valve closes after BDC
49. Coking is
Correct : A. In boiler furnace some coal becomes plastic and forms lumps or masses of coke
50. Shock effect in the nozzle generally occurs in
Correct : D. Diverging section
51. Dehydration is the process of removal of
Correct : C. moisture from anything that is wet
52. For minimum work in multistage compression, the work done on
Correct : C. All stage should be equal
53. For the same maximum pressure and heat input the least efficient cycle is
Correct : C. Weight of engine
54. A Curtis turbine is
Correct : A. A velocity compounded readtion turbine
55. If the performance of diesel engines of different sizes, cylinder dimensions and horse power ratings are to be compared, which of the following parameter can be used for such comparison?
Correct : B. Brake specific fuel consumption
56. For same heat input and same compression ratio
Correct : C. Otto cycle is more efficient than Diesel cycle
57. The volumetric efficiency of a well adjusted engine at full load may be
Correct : C. 75 to 95 percent
58. In Ambassador car, the engine is
Correct : A. Multi-cylinder type
59. Dehydration means
Correct : C. Removing water from any matter
60. Absolute pressure is
Correct : D. Gauge pressure + atmospheric pressure
61. Samples of exhaust gases from following engines have been collected
Correct : E. Jet propulsion unit
62. Normally the colour of exhaust from a petrol engine is
Correct : D. Bluish
63. The boilers using lignite as fuel do not use
Correct : E. Underfeed stoker
64. Cetane number of diesel generally used in India is in the range
Correct : B. 40 to 55
65. Scavenging efficiency of a four stroke diesel engine is
Correct : D. Between 100% and 95%
66. The bottom ring on the piston is known as
Correct : A. Oil ring
67. In a compression ignition engine squish is
Correct : D. Created towards the end of compression stroke
68. Which locomotives has the highest unbalanced forces?
Correct : B. Steam locomotives
69. For the same power and same speed, the flywheel of a two stroke engine as compared to that of a four stroke engine will be
Correct : D. Bigger
70. The maximum amount of dissociation occurs in the burnt gases of a
Correct : C. chernically correct mixture
71. In a Carnot cycle the algebraic sum of the entropy changes for the cycle is
Correct : A. Zero
72. Blue smoke from a diesel engine indicates the presence of
Correct : B. Unburnt oil
73. A turbo-charger is used
Correct : B. For supercharging reciprocating engine
74. For same compression ratio and same heat input
Correct : A. Otto cycle is more efficient
75. Which is the external loss in a steam turbine?
Correct : D. Back pressure losses
76. If engines of different horse power, rpm, cylinder dimensions are to be compared for their performance, the parameter of comparison could be
Correct : A. Mean effective pressure
77. Ambassador car engine is
Correct : B. Overhead valve type
78. Which of the following chemical acts as anti-freeze?
Correct : B. Glycol
79. A low pressure accumulator is generally used with which of the following turbine
Correct : A. Mixed pressure turbine
80. Which is not the cause for loss of heat in boiler due to incomplete combustion?
Correct : D. Boiler drum uninsulated
81. Temporary hardness of water is caused by
Correct : A. Bicarbonates of calcium and magnesium
82. Crankcase explosion occurs in
Correct : E. Two stroke SI engines
83. Which of the following offers best resistance to knocking in S.I. engines?
Correct : A. Aromatics
84. Which of the following engine can work on very lean mixture?
Correct : B. Diesel engine
85. Overall thermal efficiency of a thermal power plant is
Correct : C. Product of boiler efficiency, turbine efficiency and generator efficiency
86. In gas and petrol engines thermal efficiency may be expected in the range
Correct : B. 30 to 35 percent
87. A 200 MW generator should be cooled by
Correct : C. Hydrogen
88. Which of the following exists as highest pressure in a diesel engine
Correct : C. Fuel at the time of injection
89. A camshaft is not provided in case of
Correct : A. Two stroke engines
90. The compression ratio in case of a gas turbine is of the order of
Correct : A. 7
91. Corona is generally accompanied by a faint glow and
Correct : E. Hissing noise
92. If after some use the lower part, electrodes and beathing space of a spark plug are found coated by deposits of soot and carbon, the conclusion will be
Correct : E. Spark plug is of too high heat rating
93. As the compression ratio increases the volumetric efficiency of air compressor
Correct : B. Decreases
94. A fan is being used under certain conditions. If the fan speed is doubled the power requirement will be
Correct : A. 8 times
95. A jet engine has
Correct : B. No propeller
96. In jet engines the compression ratio
Correct : B. Varies with square of speed
97. Steam trap is a device that
Correct : A. Allows passage of water but prevents the passage of steam