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MCQs

Total Questions : 1124 | Page 12 of 113 pages
Question 111. Morse test is used to determine the I.P. of a
  1.    Single cylinder petrol engine
  2.    Four stroke engine
  3.    Single cylinder diesel engine
  4.    Multi cylinder engine
 Discuss Question
Answer: Option D. -> Multi cylinder engine
Question 112. The delay period in compression ignition engines depends upon
  1.    Temperature and pressure in the cylinder at the time of injection
  2.    Nature of the fuel mixture strength
  3.    Relative velocity between the fuel injection and air turbulence pressure of residual gases
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 113. The object of supercharging the engine is
  1.    To reduce mass of the engine per brake power
  2.    To reduce space occupied by the engine
  3.    To increase the power output of an engine when greater power is required
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 114. The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be
  1.    25%
  2.    50%
  3.    70%
  4.    100%
 Discuss Question
Answer: Option B. -> 50%
Question 115. Stoichiometric ratio is
  1.    Chemically correct air-fuel ratio by weight
  2.    Chemically correct air-fuel ratio by volume
  3.    Actual air-fuel ratio for maximum efficiency
  4.    None of the above
 Discuss Question
Answer: Option B. -> Chemically correct air-fuel ratio by volume
Question 116. The object of providing masked inlet valve in the air passage of compression ignition engines is to
  1.    Enhance flow rate
  2.    Control air flow
  3.    Induce primary swirl
  4.    Induce secondary turbulence
 Discuss Question
Answer: Option C. -> Induce primary swirl
Question 117. A diesel engine, during suction stroke, draws
  1.    Air only
  2.    Diesel only
  3.    A mixture of diesel and air
  4.    None of these
 Discuss Question
Answer: Option A. -> Air only
Question 118. In a naturally aspirated diesel engine, the air is supplied by
  1.    A supercharger
  2.    A centrifugal blower
  3.    A vacuum chamber
  4.    An injection tube
 Discuss Question
Answer: Option C. -> A vacuum chamber
Question 119. In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of
  1.    250°C
  2.    500°C
  3.    1000°C
  4.    2000°C
 Discuss Question
Answer: Option C. -> 1000°C
Question 120. In a petrol engine, the fuel supplied to the engine cylinder is mixed with required quantity of air and the mixture is ignited with a
  1.    Fuel pump
  2.    Fuel injector
  3.    Spark plug
  4.    None of these
 Discuss Question
Answer: Option C. -> Spark plug

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