Lakshya Education MCQs

Question: Pick up the false statement
Options:
A. Thermal efficiency of diesel engine is about 34%
B. Theoretically correct mixture of air and petrol is approximately 15:1
C. High speed compression engines operate on dual combustion cycle
D. S.I. engines are quality governed engines
Answer: Option D
Explanation :

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More Questions on This Topic :

Question 1. 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
Answer: Option A
Explanation :
Question 2. The pressure inside the cylinder is _________ the atmospheric pressure during the exhaust stroke.
  1.     Equal to
  2.     Below
  3.     Above
  4.     None of these
Answer: Option C
Explanation :
Question 3. The specific fuel consumption of a petrol engine compared to diesel engine of same h.p. is
  1.     Same
  2.     More
  3.     Less
  4.     Less or more depending on operating conditions
Answer: Option B
Explanation :
Question 4. The specific fuel consumption of a petrol engine compared to diesel engine of same h.p. is
  1.     Same
  2.     More
  3.     Less
  4.     Less or more depending on operating conditions
Answer: Option B
Explanation :
Question 5. The ratio of the brake power to the indicated power is called
  1.     Mechanical efficiency
  2.     Overall efficiency
  3.     Indicated thermal efficiency
  4.     Volumetric efficiency
Answer: Option A
Explanation :
Question 6. The exhaust valve in a four stroke cycle petrol engine
  1.     Opens at 50° before bottom dead center and closes at 15° after top dead center
  2.     Opens at bottom dead center and closes at top dead center
  3.     Opens at 50° after bottom dead center and closes at 15° before top dead center
  4.     May open and close anywhere
Answer: Option A
Explanation :

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