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MCQs

Total Questions : 1124 | Page 5 of 113 pages
Question 41. The basic requirement of a good combustion chamber is
  1.    Minimum turbulence
  2.    Low compression ratio
  3.    High thermal efficiency and power output
  4.    Low volumetric efficiency
 Discuss Question
Answer: Option C. -> High thermal efficiency and power output
Question 42. Crankcase explosion in I.C. engines usually occurs as
  1.    First a mild explosion followed by a bi explosion
  2.    First a big explosion followed by a mil explosion
  3.    Both mild and big explosions occurs simultaneously
  4.    Never occurs
 Discuss Question
Answer: Option A. -> First a mild explosion followed by a bi explosion
Question 43. The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will
  1.    Increase
  2.    Decrease
  3.    Be independent
  4.    May increase or decrease depending on other factors
 Discuss Question
Answer: Option B. -> Decrease
Question 44. Which is more viscous lube oil?
  1.    SEA 30
  2.    SAE 50
  3.    SAE 70
  4.    SAE 80
 Discuss Question
Answer: Option D. -> SAE 80
Question 45. The reflectivity depends upon
  1.    Geometry of the reflector
  2.    Energy of neutrons
  3.    Properties of the reflector
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 46. The sensing element in the control system of nuclear reactors measures the _________ of the neutron flux in the reactor.
  1.    Temperature
  2.    Volume
  3.    Density
  4.    None of these
 Discuss Question
Answer: Option C. -> Density
Question 47. In diesel engine, the compression ratio in comparison to expansion ratio is
  1.    Same
  2.    Less
  3.    More
  4.    Variable
 Discuss Question
Answer: Option C. -> More
Question 48. A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of
  1.    75% iso-octane and 25% normal heptane
  2.    75% normal heptane and 25% iso-octane
  3.    75% petrol and 25% diesel
  4.    75% diesel and 25% petrol
 Discuss Question
Answer: Option A. -> 75% iso-octane and 25% normal heptane
Question 49. A fuel of cetane number 40 has the same ignition quality as a mixture of
  1.    40% cetane and 60% alpha methyl naphthalene
  2.    40% alpha methyl naphthalene and 60% cetane
  3.    40% petrol and 60% diesel
  4.    40% diesel and 60% petrol
 Discuss Question
Answer: Option A. -> 40% cetane and 60% alpha methyl naphthalene
Question 50. The term scavenging is generally associated with
  1.    2-stroke cycle engines
  2.    4-stroke cycle engines
  3.    Aeroplane engines
  4.    High efficiency engines
 Discuss Question
Answer: Option D. -> High efficiency engines

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