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MCQs

Total Questions : 1124 | Page 14 of 113 pages
Question 131. Which of the following medium is compressed in a Diesel engine cylinder?
  1.    Air alone
  2.    Air and fuel
  3.    Air and lub oil
  4.    Fuel alone
 Discuss Question
Answer: Option A. -> Air alone
Question 132. The thermodynamic cycle on which the petrol engine works, is
  1.    Otto cycle
  2.    Joule cycle
  3.    Rankine cycle
  4.    Stirling cycle
 Discuss Question
Answer: Option A. -> Otto cycle
Question 133. The thermal efficiency of petrol and gas engines is about
  1.    15%
  2.    30%
  3.    50%
  4.    70%
 Discuss Question
Answer: Option B. -> 30%
Question 134. The size of inlet valve of an engine in comparison to exhaust valve is
  1.    More
  2.    Less
  3.    Same
  4.    More/less depending on capacity of engine
 Discuss Question
Answer: Option A. -> More
Question 135. A spark plug gap is kept from
  1.    0.3 to 0.7 mm
  2.    0.2 to 0.8 mm
  3.    0.4 to 0.9 mm
  4.    0.6 to 1.0 mm
 Discuss Question
Answer: Option A. -> 0.3 to 0.7 mm
Question 136. When crude oil is heated, then which of the following hydrocarbon is given off first?
  1.    Kerosene
  2.    Gasoline
  3.    Paraffin
  4.    Natural gas
 Discuss Question
Answer: Option D. -> Natural gas
Question 137. Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?
  1.    Inlet valve closing after bottom dead center
  2.    Inlet valve closing before bottom dead center
  3.    Inlet valve opening before top dead center
  4.    Exhaust valve closing after top dead center
 Discuss Question
Answer: Option B. -> Inlet valve closing before bottom dead center
Question 138. Which of the following does not relate to a spark ignition engine?
  1.    Ignition coil
  2.    Spark plug
  3.    Carburettor
  4.    Fuel injector
 Discuss Question
Answer: Option D. -> Fuel injector
Question 139. Which of the following does not relate to a compression ignition engine?
  1.    Fuel pump
  2.    Fuel injector
  3.    Governor
  4.    Carburettor
 Discuss Question
Answer: Option D. -> Carburettor
Question 140. The output of a diesel engine can be increased without increasing the engine revolution or size in following way
  1.    Feeding more fuel
  2.    Heating incoming air
  3.    Scavenging
  4.    Supercharging
 Discuss Question
Answer: Option D. -> Supercharging

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