Lakshya Education MCQs

Question: For the same power developed in i.c. engines, the cheaper system is
Options:
A. Naturally aspirated
B. Supercharged
C. Centrifugal pump
D. Turbo charger
Answer: Option B
Explanation :

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Question 1. For the same power developed in i.c. engines, the cheaper system is
  1.     Naturally aspirated
  2.     Supercharged
  3.     Centrifugal pump
  4.     Turbo charger
Answer: Option B
Explanation :
Question 2. 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 3. In a typical medium speed, 4-stroke cycle diesel engine
  1.     Fuel injection starts at 10° before top dead center and ends at 20° after top dead center
  2.     Fuel injection starts at top dead center and ends at 20° after top dead center
  3.     Fuel injection starts at just before top dead center and ends just after top dead center
  4.     May start and end anywhere
Answer: Option A
Explanation :
Question 4. The fuel valve in a four stroke cycle diesel engine
  1.     Opens at 15° after top dead center and closes at 20° before bottom dead center
  2.     Opens at 15° before top dead center and closes at 20° after top dead center
  3.     Opens at top dead center and closes at bottom dead center
  4.     May open and close anywhere
Answer: Option B
Explanation :
Question 5. The two reference fuels used for cetane rating are
  1.     Cetane and iso-octane
  2.     Cetane and alpha-methyl naphthalene
  3.     Cetane and normal heptane
  4.     Cetane and tetra ethyl lead
Answer: Option B
Explanation :
Question 6. The two reference fuels used for cetane rating are
  1.     Cetane and iso-octane
  2.     Cetane and alpha-methyl naphthalene
  3.     Cetane and normal heptane
  4.     Cetane and tetra ethyl lead
Answer: Option B
Explanation :

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