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MCQs

Total Questions : 1124 | Page 16 of 113 pages
Question 151. Iso-octane (C₈H₁₈) has octane number of
  1.    0
  2.    50
  3.    100
  4.    120
 Discuss Question
Answer: Option C. -> 100
Question 152. In a four stroke cycle engine, the sequence of operations is
  1.    Suction, compression, expansion and exhaust
  2.    Suction, expansion, compression and exhaust
  3.    Expansion, compression, suction and exhaust
  4.    Compression, expansion, suction and exhaust
 Discuss Question
Answer: Option A. -> Suction, compression, expansion and exhaust
Question 153. In loop scavenging, the top of the piston is
  1.    Flat
  2.    Contoured
  3.    Slanted
  4.    Depressed
 Discuss Question
Answer: Option B. -> Contoured
Question 154. The actual volume of fresh charge admitted in 4-stroke petrol engine is
  1.    Equal to stroke volume
  2.    Equal to stroke volume and clearance volume
  3.    Less than stroke volume
  4.    More than stroke volume
 Discuss Question
Answer: Option C. -> Less than stroke volume
Question 155. The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called
  1.    Mechanical efficiency
  2.    Overall efficiency
  3.    Volumetric efficiency
  4.    Relative efficiency
 Discuss Question
Answer: Option C. -> Volumetric efficiency
Question 156. In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have
  1.    Low density
  2.    Low temperature
  3.    Long ignition delay
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 157. The inlet valve of a four stroke cycle internal combustion engine remains open for
  1.    130°
  2.    180°
  3.    230°
  4.    270°
 Discuss Question
Answer: Option C. -> 230°
Question 158. The turbine of the turboprop engine is __________ that of the turbojet engine.
  1.    Same as
  2.    Smaller than
  3.    Bigger than
  4.    None of these
 Discuss Question
Answer: Option C. -> Bigger than
Question 159. Fuel oil consumption guarantees for I .C. engine are usually based on
  1.    Low heat value of oil
  2.    High heat value of oil
  3.    Net calorific value of oil
  4.    Calorific value of fuel
 Discuss Question
Answer: Option B. -> High heat value of oil
Question 160. The thermal efficiency of diesel engines on weak mixtures is
  1.    Unaffected
  2.    Lower
  3.    Higher
  4.    Dependent on other factors
 Discuss Question
Answer: Option C. -> Higher

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