Quiz

Question: Supercharging is essential in
Options:
A.Diesel engines
B.Gas turbines
C.Petrol engines
D.Aircraft engines
Answer: Option D

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Question 1. 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
Answer: Option B
Question 2. 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
Answer: Option D
Question 3. The colour of exhaust from diesel engine is generally
  1.    White
  2.    Bluish
  3.    Black
  4.    Violet
Answer: Option C
Question 4. 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%
Answer: Option D
Question 5. 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.
Answer: Option B
Question 6. 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
Answer: Option C

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