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MCQs

Total Questions : 1124 | Page 15 of 113 pages
Question 141. A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is
  1.    248 cm3
  2.    252 cm3
  3.    264 cm3
  4.    286 cm3
 Discuss Question
Answer: Option C. -> 264 cm3
Question 142. The pressure at the end of compression, in diesel engines, is approximately
  1.    10 bar
  2.    20 bar
  3.    25 bar
  4.    35 bar
 Discuss Question
Answer: Option D. -> 35 bar
Question 143. Air fuel ratio for idling speed of a petrol engine is approximately
  1.    1 : 1
  2.    5 : 1
  3.    10 : 1
  4.    15 : 1
 Discuss Question
Answer: Option C. -> 10 : 1
Question 144. The specific fuel consumption per BH hour for a petrol engine is approximately
  1.    0.15 kg
  2.    0.2 kg
  3.    0.25 kg
  4.    0.3 kg
 Discuss Question
Answer: Option C. -> 0.25 kg
Question 145. The maximum propulsive efficiency of a turbojet engine is at a speed of
  1.    1000 km/h
  2.    2000 km/h
  3.    2400 km/h
  4.    3000 km/h
 Discuss Question
Answer: Option C. -> 2400 km/h
Question 146. The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of
  1.    Morse test
  2.    Prony brake test
  3.    Motoring test
  4.    Heat balance test
 Discuss Question
Answer: Option A. -> Morse test
Question 147. The air-fuel ratio of the petrol engine is controlled by
  1.    Fuel pump
  2.    Governor
  3.    Injector
  4.    Carburettor
 Discuss Question
Answer: Option D. -> Carburettor
Question 148. The air-fuel ratio in petrol engines is controlled by
  1.    Controlling valve opening/closing
  2.    Governing
  3.    Injection
  4.    Carburetion
 Discuss Question
Answer: Option D. -> Carburetion
Question 149. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged?
  1.    Yes
  2.    No
  3.    To some extent
  4.    Unpredictable
 Discuss Question
Answer: Option B. -> No
Question 150. The _________ engines can work on very lean mixture of fuel.
  1.    Spark ignition
  2.    Compression ignition
  3.    Both (A) and (B)
  4.    None of these
 Discuss Question
Answer: Option B. -> Compression ignition

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