1. During idling, mixture provided by simple carburetor is
Correct : C. lean
2. The fuction of the choke is to provide
Correct : C. rich mixture
3. Simple carburetor provides correct quality of mixture
Correct : D. only at one throttle position
4. The correct expression for nozzle lip is
Correct : A. tip height – fuel surface height
5. The tip of the nozzle is kept
Correct : B. at level above the fuel level in float chamber
6. The drawbacks of carburetor includes
Correct : D. all of the above
7. MPFI means
Correct : B. multi point fuel injection
8. In port injection system, location of injector is
Correct : C. inside intake manifold near intake port
9. In carburetor, choke is located on which side of the venturi?
Correct : B. air filter side
10. In carburetor, throttle valve is located on which side of the venturi?
Correct : A. engine side
11. In complete caruretor, idling passage opens in a draft tube at which position?
Correct : A. engine side of throttle valve
12. The cold start injector provides
Correct : B. rich mixture
13. Ignition lag, spreading of flame and after burning are the stages observed during combustion in
Correct : A. petrol engines
14. The combustion will not start immediately after spark because of
Correct : C. ignition lag
15. The time interval between formation of spark and appreciable pressure rise is
Correct : B. ignition lag
16. A motoring curve is plotted when
Correct : D. the cycle is not fired
17. Which of the following is not necessary condition for starting of combustion process in SI engines?
Correct : A. compression of charge
18. Effect of spark in SI engines is____
Correct : D. rise in temperature
19. In SI enginesmaximum amount of fuel is burnt during the stage____
Correct : C. flame propagation
20. In SI engines the flame travels in____
Correct : A. spherical shape
21. In D-MPFI system the quantity sensed is ____
Correct : A. pressure
22. The D-MPFI system responds to vacuum sensed in____
Correct : B. intake manifold
23. L-MPFI ststem responds to____
Correct : D. flow rate
24. Arrange the phases of combustion in ascending order according to amount heat evolved in each phase
Correct : A. ignition lag, after burning, flame propagation
25. In SI engines flame speed decreases with increase in
Correct : D. residual gases
26. In SI engines, Maximum flame speed is obtained when equivalance ratio is___
Correct : C. between 1.1 to 1.2
27. With increase in compression ratio, flame travels
Correct : A. faster
28. In SI engines flame speed always increases with____
Correct : D. compression ratio
29. With increase in speed, the crank angle required for flame propagation___
Correct : C. remains same
30. If cooling water temperature is decreased flame speed___
Correct : B. decreases
31. Increasing cooling water temperature in SI engines, kncocking tendency_____
Correct : A. increases
32. To reduce knocking, the fuel in SI engine should have ____ self ignition temperature
Correct : A. low
33. Detonation in SI engine means
Correct : D. auto-ignition of charge after the delay period is over
34. Knocking in SI engine occurs when___
Correct : B. flame reaches after the delay period is over
35. Pre-ignition takes place when____
Correct : C. ignition starts before spark
36. Larger combustion chambers
Correct : A. increase detonation
37. To prevent knocking flame propagation should be
Correct : A. retareded
38. To reduce knocking in SI engines, self ignition temperature of fuel should be ____
Correct : A. high
39. Which of the following is not an effect of increased intake temperature?
Correct : D. does not affect anything
40. As load increases, the knocking tendency of SI engines____
Correct : A. increases
41. As the speed of flame travel increases, detonation___
Correct : B. decreases
42. AS distance of flame travel increases, detonation
Correct : A. increases
43. Detonation tendency is maximum for air:fuel ratio___
Correct : C. 12:1 to 14;1
44. To reduce detonation, the spark plugh should be located
Correct : C. centrally
45. Which is not a probable location of preignition?
Correct : D. intake valve
46. Knocking in SI engines will be less if
Correct : C. delay period is high and flame speed is high
47. In SI engines, to aviod knock, combustion chamber should have___
Correct : A. small bore
48. Octane rating is___
Correct : D. measure of fuel resistance to knock in si engines
49. For octane rating a standard reference fuel consists of
Correct : C. combination of 2,2,4 trimethyl pentane and n-heptane
50. 2,2,4 trimethyl pentane has octane number equal to
Correct : C. 100
51. n-heptane has octane number equal to
Correct : A. 0
52. Octane number 60 means, the fuel has antiknock proper equal to fuel from by
Correct : B. 60% of iso octane and 40% n-heptane
53. Dopes are___
Correct : B. chemical which will decrease knocking tendency of fuel
54. RON means ____
Correct : D. research octane number
55. MON means ___
Correct : D. motor octane number
56. RON is calculated at___
Correct : A. low speed and low temperature
57. Which is correct expression?
Correct : C. sensitivity=ron-mon
58. Sensitivity shows
Correct : A. change in eprformance of fuel under test condition and practical condition
59. Higher sensitivity of fuel shows___
Correct : B. poor oerformance under serve conditions
60. A 4-cylinder, 4-stroke petrol engine has,swept volume=0.001cubic meter and N=4200rpm. The power developed within the enigne cylinder is
Correct : B. 140kw
61. B.P of a four cylinde, four stroke engine is measured by brake dynamometer which develops a torque of 1000N-M at 4200rpm. The B.P is about
Correct : A. 440kw
62. In an eight cylinder engine the fuel suplied was 4000kg in 2 hours and the out put is 8000KW. Its bsfc is about
Correct : C. 0.25kg/kwh
63. brake thermal efficiency of ci engine is about
Correct : B. 30-40%
64. four cylinder engine , the indicated power is 100KW and brake power is 20KW/cylinder . Its mechanical efficiency is about
Correct : C. 0.8
65. brke mean effective pressure and indicated mean effective pressure of an ic engine are 8br and 10 bar resp. the mechanical efficiency of an engine when runnign at 4000 rpm is
Correct : A. 0.8
66. an engine develops 12KW and frictional power is 4KW . The mechanical efficiency is about
Correct : C. 0.75
67. an engine develops 100 Kw wihing the cylinder using fuel having calrofic value of 40000kj/kg with brake thermal efficiency 0.24 and mechanical efficiency 0.8. the fuel consumprion in kg/s…………….?
Correct : A. 30
68. A four cylinde si engine develops 100 kw running at a constant speed . When eginition of each cylinder is cut-off successively at the same speed , the BP is 71, 70, 71, 72 KW. The FP of engine and mechanical efficiency are
Correct : B. 16kw, 86.2%
69. a vertical single cylinder four stroke diesel engine has a bore of 80mm and stroke of 100mm resp. it is water cooled and develops a torque of 305 N-m . What is the mean effective pressure …………?
Correct : B. 5.875 bar
70. a diesel engine consumes 5 grams fuel per second and develops a brake power 75KW. It has a mechanical efficiency of 85%. What would be the bsfc………?
Correct : C. 0.066 g/kw s
71. a diesel engine consumes 5 grams fuel per second and develops a brake power 75KW. It has a mechanical efficiency of 85%, bsfc is 0.066 g/KW s . What would be the isfc….?
Correct : B. 0.204 kg/kwh
72. a four stroke gas engine has a bor of 20cm and stroke of 35 cm . What would be the swept volume of the engine
Correct : D. 7853.93 cc
73. a diesel engine consumes at the rate of 5.5gm/ses and develops a power of 75KW . If the mechanical efficiency is 85% and calorific value is 44 MJ/kg. what would be the bsfc
Correct : A. 0.074 g/kws
74. a six cylinder gasoline engine operates on four stroke cycle. It runs at the speed of 4100rpm and develops a torque of 160N-m. what would be the brake power of the engine ……..?
Correct : B. 68.66 kw
75. a sic cylinder gasoline engine operates on a four stroke cycle. The bore of each cylinder is 80mm and the stroke is 100 mm. it runs at a speed of 4100 rpm and develops a brake power of 68.66Kw………what would be the brake mean effective pressure…………….?
Correct : C. 6.66bar
76. a six cylinder gasoline engine operates on the four stroke cycle . The bore of each cylinder is 80 mm and stroke is 100mm. What would be the compression ratio of the engine if clearnce volume per cylinder is 70cc
Correct : B. 8.18
77. if the compression ratio of otto cycle is 8.18, what would be the air standard efficiency
Correct : C. 0.428
78. if the compression ration of otto cycle is 8.18 and brake thermal efficiency of actual cyle is 29.03%........what would be the relative efficienct
Correct : A. 0.51109
79. a six cylinder four stroke petron engine having a bore of 90 mm and stroke of 100mm and runs at a speed of 2500 rpm. What would be the indicated power
Correct : C. 67.593kw
80. a six cylinder four stroke petrol engine develops a indicated power of 67.593 KW with indicated mean specific fuel consumption os 0.3kg/Kwh. What would be the mas flow rate of the fuel in kg/hr
Correct : C. 20.278
81. the air standard efficiecny of engine is 0.42647 and corsponding relative efficiecny is 0.55. what would be the corsponding indicated thermal efficiency
Correct : A. 0.2346
82. what would be the brake power of the engine, if the net brake load on the engine is 1470 N, effective brake corcumeference is of 4m and engine runs at the speed of 233.33rpm
Correct : C. 26.589kw
83. if the brake power and indicated power of an engine are 22.286 KW and 56.589KW, what would be mecanicale efficiency of an engine ………..?
Correct : D. 0.86
84. what would be the number of powe strokes per min ……..? If a six cylinder four stroke engine runs at 233.33 rpm and the number of missed powe stroke is 8.33 per min
Correct : C. 108.66
85. actual number of stroke per min will be equll to
Correct : C. theroricl stroke per min - missed stroke per min
86. a four cylinder petrol engine with 70mm bore and 100 mm stroke length working on four stroke pricniple develops a torque 140 N-m at 4000 rpm……what would be the brake power of the engine ……?
Correct : A. 58.65kw
87. what would be the brake thermal efficiency of the engine, if the brake power of the engine is of 58.65KW, fuel consumption is 14kg/hr and the calrofic value of the fuel is 42500kj/kg
Correct : A. 0.3548
88. what would be the compression ratio of the engine if the clearnce volume is 0.065lit and the engine bore is of 70mm and the stroke is of 100mm
Correct : C. 6.923
89. what would be the mean effective pressure of the engine if the area of the indicator diagram is 13 cm2 , length of the indicator diagram is of 6cm and spring constant 2.9 bar/cm
Correct : B. 5.8bar
90. what would be the mass flow rate of gasoline in kg/s, if the engine consumes 8lit/hr, taking the specific gravity of the gasoline is 0.8
Correct : A. 0.00178
91. what would be the mass flow rate of the gasoline in kg/s, the engine sonsumes 8lit/hr of gasoline, taking density of gasoline is 800 kg/cubic meter
Correct : B. 0.00178
92. a single cylinder engine operating at 2000 rpm develops a torqu of 8 N-m and the indicated power of the engine is 2.0KW. What would be the frictional power
Correct : C. 0.3253kw
93. for four cylinder four stroke petrol engien the bore is 11cm and stroke is 13cm, running at speed of 2250 rpm. What is the swept volume of the engine
Correct : C. 0.37 cubic meter per second
94. a single cylinder four stroke engine having bore 18 cm and stroke 36cm, revolving at 285 rpm and having mean effective pressure 7.2 bar. The indicated power is
Correct : A. 7.85kw
95. what would be the mean effective pressure of the engine if the area of the positive loop of the indicator diagram is of 5.75 squr cm, area of negative loop of the indicator diagram 0.25 squre cm and the length of the indicator diagrma is of 5.5cm
Correct : A. 4bar
96. what would be the heat supplied to the engine in KJ/s, if the engine consumes 8 lit of gasoline per second. Take caloric value and specific gravity of fuel is 44000 kj/kg and 0.8 resp.
Correct : A. 9.78
97. what would be the heat supplied to the engine in KJ/s, if the engine consumes 8 lit of gasoline per second. Take caloric value and density of fuel is 44000 kj/kg and 800 kg per cubic meter resp.
Correct : B. 9.78
98. if the brake thermal efficiecny and indicated thermal efficiecny of the engine is 28% and 35%. What would be the mechanical efficiency of the engien
Correct : B. 0.8
99. what is the density of the fuel whose specific gravity is 0.8
Correct : A. 800 kg/ cubic meter
100. what would be the air fuel ratio ot the engine if the air consumtion time for 0.1 cubic meter as 16.3 sec and whose density is 1.175kg per cubic meter and fuel consumtion time for 10 cc as 20.sec whos specific gravity is 0.7…….