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Total Questions : 1124 | Page 50 of 113 pages
Question 491.


Nuclear reactors are used


  1.    to produce heat for thermoelectric power
  2.    to produce fissionable material
  3.    to propel ships, submarines, aircrafts
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these


Question 492.

In hit and miss governing, the fuel supply is cut-off completely during one or more number of cycles.


  1.    Yes
  2.    No
 Discuss Question
Answer: Option A. -> Yes


Question 493.


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 494.


The diesel engines are also known as __________ engines.


  1.    compression ignition
  2.    spark ignition
 Discuss Question
Answer: Option A. -> compression ignition


Question 495.


The reference fuels for knock rating of spark ignition engines would include


  1.    iso-octane and alpha-methyl naphthalene
  2.    normal octane and aniline
  3.    iso-octane and normal hexane
  4.    normal heptane and iso-octane
 Discuss Question
Answer: Option D. -> normal heptane and iso-octane


Question 496.


In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the


  1.    beginning of suction stroke
  2.    end of suction stroke
  3.    beginning of exhaust stroke
  4.    end of exhaust stroke
 Discuss Question
Answer: Option A. -> beginning of suction stroke


Question 497. The fuels in order of decreasing knock tendency for spark ignition engines are
  1.    Paraffin, napthene, aromatic
  2.    Napthene, paraffin, aromatic
  3.    Napthene, aromatics, paraffin
  4.    Paraffin, aromatic, napthene
 Discuss Question
Answer: Option A. -> Paraffin, napthene, aromatic
Question 498. Supercharging is the process of
  1.    Supplying compressed air to remove combustion products fully
  2.    Injecting excess fuel for raising more loads
  3.    Providing forced cooling air
  4.    Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
 Discuss Question
Answer: Option D. -> Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
Question 499. Which of the following is false statement? Some of the methods used to reduce diesel smoke are as follows
  1.    Using additives in the fuel
  2.    Increasing the compression ratio
  3.    Adherence to proper fuel specification
  4.    Avoidance of overloading
 Discuss Question
Answer: Option B. -> Increasing the compression ratio
Question 500. The minimum cranking speed in case of petrol engine is about
  1.    One fourth of operating speed
  2.    60 - 80 rpm
  3.    Half the operating speed
  4.    250 - 300 rpm
 Discuss Question
Answer: Option B. -> 60 - 80 rpm

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