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MCQs

Total Questions : 1124 | Page 9 of 113 pages
Question 81. A diesel engine has compression ratio from
  1.    6 to 10
  2.    10 to 15
  3.    15 to 25
  4.    25 to 40
 Discuss Question
Answer: Option C. -> 15 to 25
Question 82. A petrol engine has compression ratio from
  1.    6 to 10
  2.    10 to 15
  3.    15 to 25
  4.    25 to 40
 Discuss Question
Answer: Option A. -> 6 to 10
Question 83. The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is
  1.    More
  2.    Less
  3.    Same
  4.    May be more or less depending on engine capacity
 Discuss Question
Answer: Option B. -> Less
Question 84. Which of the following fuel detonates readily?
  1.    Benzene
  2.    Iso-octane
  3.    Normal heptane
  4.    Alcohol
 Discuss Question
Answer: Option C. -> Normal heptane
Question 85. Pour point of fuel oil is the
  1.    Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
  2.    Temperature at which it solidifies or congeals
  3.    It catches fire without external aid
  4.    Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off
 Discuss Question
Answer: Option B. -> Temperature at which it solidifies or congeals
Question 86. The function of a distributor in a coil ignition system of I.C. engines is
  1.    To distribute spark
  2.    To distribute power
  3.    To distribute current
  4.    To time the spark
 Discuss Question
Answer: Option D. -> To time the spark
Question 87. Compression ratio of I.C. Engines is
  1.    The ratio of volumes of air in cylinder before compression stroke and after compression stroke
  2.    Volume displaced by piston per stroke and clearance volume in cylinder
  3.    Ratio of pressure after compression and before compression
  4.    Swept volume/cylinder volume
 Discuss Question
Answer: Option A. -> The ratio of volumes of air in cylinder before compression stroke and after compression stroke
Question 88. The effective inhibitor of pre-ignition is
  1.    Alcohol
  2.    Water
  3.    Lead
  4.    None of these
 Discuss Question
Answer: Option B. -> Water
Question 89. 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
 Discuss Question
Answer: Option A. -> Pre-ignition
Question 90. 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
 Discuss Question
Answer: Option D. -> All of these

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