6. Best method to measure indicated mean effective pr (imep) is by
Correct : B. electronic indicator
7. Indicator diagram is used to measure
Correct : A. imep
8. Indicator diagram is the plot of_____on cartesian co-ordinates.
Correct : A. p-v
9. Mechanical indicators are suitable to measure imp in case of
Correct : A. low speed engine up to 1500 rpm
10. If a= net area of diagram in mm², l= length of indicator diagram in cm & k= spring constant in N/m²/m the imp in bar equals
Correct : B. (a/l) x k x 10ˉ⁹
11. Engine indicator is used to measure
Correct : B. imep
12. If work developed by the engine per cycle is W, then the indicated mean effective pr equals to
Correct : B. w / stroke volume
13. Best method to measurement of B.P. is
Correct : C. hydraulic dynamometer
14. Which of the dynamometer cannot be used for measurement of B.P. at high speeds
Correct : A. prony brake
15. Which of the following dynamometer is suitable to measure B.P. of an aircraft
Correct : D. eddy current
16. F.P.______with increase in speed
Correct : A. increases
17. Which is the best way to measure F.P. of an I.C., engine
Correct : B. morse test
18. Willan's line method for determining F.P. is applicable to
Correct : C. both a & b
19. I.P. of engine can be determined by
Correct : B. morse test
20. Increase in F.P. of an engine causes
Correct : D. all the above
21. Morse test in multi cylinder engine is used to determine
Correct : A. mechanical efficiency
22. Which is assumed constant in determining F.P. by Willan's line method.
Correct : C. indicated thermal efficiency
23. The range of mechanical efficiency for automobile is
Correct : C. 70-80%
24. The measurement of frictioned power by Willans line is applicable only to
Correct : A. c.i engine at a particualr speed
25. morse test is applicable only to
Correct : C. multi cylinder c.i engine
26. the most accurate method of determining friction power is by
Correct : D. measurement of brake and indicated power
27. in the air base method of measuring air flow, the air base is provided to
Correct : C. have constant flow
28. the air box/ swept volume ratio should be in the range for single cylinder engine
Correct : C. 500-600%
29. the best method of measuring speed is by
Correct : A. mechanical tachometer
30. flame ionization detector is used for measuring
Correct : A. hc
31. chemilumme scence analyzer is used for measuring
Correct : C. nox
32. non dispersive infrared analyzer is widely accepted instrument for measuring
Correct : B. carbone monoxide
33. if n is theorem, number of power stroke per minute in a four stroke enigne is
Correct : A. n/2
34. if n is the rpm, number of power strokes per min in a two stroke engine is
Correct : B. n
35. mechanical effficiency is the ratio of
Correct : C. brake power to indicated power
36. volumetric efficiency is a measure of
Correct : C. brathing capacity of the engine
37. thermal efficiency varries
Correct : A. inversely as specific fuel consumption
38. the spark timing and combustion rate should be should be such that
Correct : A. one half of the total pressure occurs at tdc
39. indicated power is directly proportional to
Correct : A. air consumption
40. the brake thermal efficiecny of SI engine is in the range of
Correct : B. 25%-35%
41. the boiling point of a four cylinder engine is 30 with all cylinder firing and 20 with one cylindr cut
Correct : B. 0.75
42. The bore and stroke of a single cylinder four stroke engine are 100 mm and 160 mm resp. if the brake torqe is 50NM, the brake mean effective pressure is
Correct : A. 5 bar
43. the volumetric efficiecy of a well disigned engine is the
Correct : D. 75-90%
44. if the performance of SI engine manufacturer having different capacities sizes and system are to be compared , the common parameter would be
Correct : D. mean effective pressure
45. mores test is conducted on
Correct : B. multi cylinder engine
46. endurance test for IC engine is conducted for
Correct : D. 500hrs
47. which of the following factor will not assist in improving thermal efficiency of a compression ignition engine
Correct : D. high surgace to volume ratio
48. which statement is correct
Correct : C. morese test can be conducted only on multicylinder engine
49. rope brake dynamometer falls under the category of
Correct : C. mechanical friction type dynamometer
50. prony brakes are used for testing
Correct : A. small engine
51. which of the following is performed for supercharging of ic engine
Correct : B. axial compressor
52. from the engine indicator diagram we obtain
Correct : A. indicatecd mean effective pressure
53. the more accurate dynamometer is
Correct : A. prony brake type
54. the most commonly used dynamometer on account of its simplicity of construction is the
Correct : A. brake type
55. brake mean effective pressure in an engine depends upon its
Correct : B. torque only
56. brake thermal efficiecny of si engine usually varies between
Correct : A. 25-30%
57. the brake power is the
Correct : A. power availabale at the output of the shaft
58. the total power developed by the combustion of the fuel is
Correct : B. ip
59. mean effective pressure is the pressure
Correct : B. which is acting on the piston through out the power stroke
60. fuel air ratio is
Correct : D. all of the abov e
61. specific fuel consumption is
Correct : A. amount of fuel consumed per unit power developed per hour
62. heat balance sheet indicates
Correct : B. brake up of the total energy input in to different parts
63. the frictional power is
Correct : B. bp-ip
64. identify the correct statement
Correct : B. lower friction means high barke power
65. power out put of an engine can be increased by
Correct : D. all of the above
66. power out put of an engine can be increased by
Correct : D. all of the above
67. increasing the power out put by increasing the compression ratio is limited by
Correct : D. hucr
68. increase in speed to improve B.P is limited by
Correct : D. all of the above
69. utilization of energy in exhaust gases causes power output to
Correct : A. increases
70. increase in charge density will
Correct : C. both a & b
71. supercharging is a process of increasing the
Correct : D. charge density
72. supercharging is essential for
Correct : C. aircraft engine
73. power out put of static engine at high alitude compared to power out put at sea level is
Correct : D. can not predict
74. objective of superchargin are
Correct : D. all of the above
75. which is not the objectve of supercharging
Correct : B. to increase weight to power ratio
76. an exhaust gas driven blower/ compressor to increase charge density is called
Correct : D. none of the above
77. a blower/compressor driven by engine shaft to increase charge density is called
Correct : D. none of the above
78. power out put of an engine compared to turbocharge is
Correct : C. less
79. which is not a supercharger
Correct : D. pump
80. compressed air of turbochar is cooled in aftercooler before supply to engine because it
Correct : D. both b and c
81. efficiency of turbocharged engine compared to naturally aspirated engine is
Correct : D. can not predict
82. a free piston engine has
Correct : D. gear driven supercharger and separate power turbine
83. Reason for not using very high suction pressure in an engine with the help of supercharger / turbocharger are
Correct : D. all of the above
84. Reason for not using very high suction pressure in an engine with the help of supercharger / turbocharger are
Correct : D. all of the above
85. superchargin is usually is not employed in si engine in the following cases
Correct : A. static or mobile enigne
86. superchargin in ci engine is limited by
Correct : C. load on bearing and fuel economy
87. A theory in which chain carriers are formed in one step and destroyed in the next step relate to the theory of combustion as
Correct : B. chain reaction theory
88. Time interval between instant the spark is given and the point a tiny flame appears is called
Correct : D. either \a\ or b\
89. Angle tuned by crank between the point of spark and formation of flame is called
Correct : C. ignition delay angle
90. In a vertical engine, the crank angle before TDC at the instant spark is given is called
Correct : D. angle of spark advance
91. The travel of flame speed (m/s) in the S.I. combustion chamber is approximately
Correct : B. 15 to 35
92. Ignition lag in S.I. engine reduces due to
Correct : D. both a and c
93. Minimum ignition lag is obtained when
Correct : A. rich mixture(5 to 10%)
94. Ignition delay period with increase in speed
Correct : C. remains same
95. Ignition delay angle________with increase in speed
Correct : A. increases
96. The speed of the flame propagation increases with increase in
Correct : D. all of the above
97. Increase in turbulence________the flame speeds
Correct : A. increases
98. Increase in speed of the engine________the flame speeds
Correct : A. increases
99. Increase in the size of similar engines__________the crank angle turned during flame travel across the cylinder
Correct : C. doesn\t affect
100. Flame speed in combustion chamber during flame travel are
Correct : B. low at beginning and end and high in the middle