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MCQs

Total Questions : 1124 | Page 48 of 113 pages
Question 471.


The purpose of testing an internal combustion engine is


  1.    to determine the information, which can not be obtained by calculations
  2.    to conform the data used in design, the validity of which may be doubtful
  3.    to satisfy the customer regarding the performance of the engine
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above


Question 472.

.Ordinary water is sometimes used as moderator when enriched uranium is used as a fuel in nuclear power plants.


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


Question 473.


Each fission of U235 produces on the average __________ fast neutrons as a product of reaction.


  1.    2.46
  2.    24.6
  3.    246
  4.    2460
 Discuss Question
Answer: Option A. -> 2.46


Question 474.


The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the


  1.    jet area is automatically varied depending on the suction
  2.    the flow from the main jet is diverted to the compensating jet with increase in speed
  3.    the diameter of the jet is constant and the discharge coefficient is invariant
  4.    flow is produced due to the static head in the float chamber
 Discuss Question
Answer: Option D. -> flow is produced due to the static head in the float chamber


Question 475.


In petrol
engine, using a fixed octane rating fuel and fixed compression ratio,
supercharging will __________ the knocking tendency.


  1.    not effect
  2.    decrease
  3.    increase
 Discuss Question
Answer: Option C. -> increase


Question 476.

 
Reactors for propulsion applications are designed for


  1.    any form of uranium
  2.    natura uranium
  3.    enriched uranium
  4.    plutonium
 Discuss Question
Answer: Option C. -> enriched uranium


Question 477.

 
The detonating tendency in petrol engines increases with increase of compression ratio.


  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True


Question 478.
 
Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
  1.    heavy water
  2.    graphite
  3.    carbon dioxide
  4.    no moderator is needed
 Discuss Question
Answer: Option D. -> no moderator is needed


Question 479.

A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to


  1.    slow down the speed of fast moving neutrons
  2.    control the reaction
  3.    reduce the temperature
  4.    extract heat from nuclear reaction
 Discuss Question
Answer: Option A. -> slow down the speed of fast moving neutrons


Question 480.

In a four stroke cycle petrol engine, the charge is ignited at


  1.    `30^circ` before top dead centre
  2.    `30^circ` after top dead centre
  3.    `30^circ` before bottom dead centre
  4.    `30^circ` after bottom dead centre
 Discuss Question
Answer: Option A. -> `30^circ` before top dead centre


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