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MCQs

Total Questions : 1124 | Page 10 of 113 pages
Question 91. The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)
  1.    1 - rγ - 1
  2.    1 + rγ - 1
  3.    1 - (1/rγ - 1)
  4.    None of these
 Discuss Question
Answer: Option C. -> 1 - (1/rγ - 1)
Question 92. The frictional power (F.P.) is given by
  1.    F.P. = B.P. - I.P.
  2.    F.P. = I.P. - B.P.
  3.    F.P. = B.P./I.P.
  4.    F.P. = I.P./B.P.
 Discuss Question
Answer: Option B. -> F.P. = I.P. - B.P.
Question 93. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be
  1.    2%
  2.    4%
  3.    8%
  4.    14%
 Discuss Question
Answer: Option D. -> 14%
Question 94. Supercharging is essential in
  1.    Diesel engines
  2.    Gas turbines
  3.    Petrol engines
  4.    Aircraft engines
 Discuss Question
Answer: Option D. -> Aircraft engines
Question 95. Which of the following statement is correct regarding petrol engines?
  1.    A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure
  2.    The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug
  3.    The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition
  4.    All of the above
 Discuss Question
Answer: Option B. -> The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug
Question 96. The firing order in an I.C. engine depends upon
  1.    Arrangement of the cylinders
  2.    Design of crankshaft
  3.    Number of cylinders
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 97. The colour of exhaust from diesel engine is generally
  1.    White
  2.    Bluish
  3.    Black
  4.    Violet
 Discuss Question
Answer: Option C. -> Black
Question 98. A heat engine utilizes the
  1.    Calorific value of oil
  2.    Low heat value of
  3.    High heat value of oil
  4.    Mean heat value of oil
 Discuss Question
Answer: Option C. -> High heat value of oil
Question 99. In the opposed piston diesel engine, the combustion chamber is located
  1.    Above the piston
  2.    Below the piston
  3.    Between the pistons
  4.    There is no such criterion
 Discuss Question
Answer: Option C. -> Between the pistons
Question 100. A mixture containing 65% of iso-octane and 35% of normal heptane will have
  1.    Cetane number 65
  2.    Octane number 65
  3.    Cetane number 35
  4.    Octane number 35
 Discuss Question
Answer: Option B. -> Octane number 65

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