Question: The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)
A.1 - rγ - 1
B.1 + rγ - 1
C.1 - (1/rγ - 1)
D.None of these
Answer: Option C

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Question 1. 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 2. 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 3. Supercharging is essential in
  1.    Diesel engines
  2.    Gas turbines
  3.    Petrol engines
  4.    Aircraft engines
Answer: Option D
Question 4. The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in meters, and d = Dia. of rope in meters)
  1.    B.P = (Wl × 2πN)/60 watts
  2.    B.P = [(W - S) πDN]/60 watts
  3.    B.P = [(W - S) π (D + d) N]/60 watts
  4.    All of these
Answer: Option D
Question 5. The ignition of the charge by some hot surface within the engine before the passage of spark is called
  1.    Pre-ignition
  2.    Detonation
  3.    Ignition delay
  4.    Auto-ignition
Answer: Option A
Question 6. The effective inhibitor of pre-ignition is
  1.    Alcohol
  2.    Water
  3.    Lead
  4.    None of these
Answer: Option B

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