Lakshya Education MCQs

Question: In a petrol engine, if diesel is used, then the engine will
A.Not run
B.Run more efficiently
C.Run at high speed
Answer: Option A

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Question 1. Supercharging is the process of supplying the intake air to the engine cylinder at a density _________ the density of the surrounding atmosphere.
  1.    Equal to
  2.    Less than
  3.    Greater than
  4.    None of these
Answer: Option C
Question 2. Air fuel ratio at which a petrol engine cannot work is
  1.    8 : 1
  2.    10 : 1
  3.    15 : 1
  4.    20 : 1 and less
Answer: Option D
Question 3. The volumetric efficiency of a well designed engine may be
  1.    30 to 40%
  2.    40 to 60%
  3.    60 to 70%
  4.    75 to 90%
Answer: Option D
Question 4. A diesel engine as compared to petrol engine (both running and rated load) is
  1.    More efficient
  2.    Less efficient
  3.    Equally efficient
  4.    Other factors will decide it
Answer: Option A
Question 5. A supercharged engine as compared to an ordinary engine
  1.    Requires smaller foundation
  2.    Is lighter
  3.    Consumes less lubricating oil
  4.    All of these
Answer: Option D
Question 6. The brake power of a diesel engine, keeping other parameters constant, can be increased by
  1.    Decreasing the density of intake air
  2.    Increasing the temperature of intake air
  3.    Increasing the pressure of intake air
  4.    Decreasing the pressure of intake air
Answer: Option C

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