Lakshya Education MCQs

Question: Stoichiometric quantity of air is the
Options:
A. Air present in atmosphere at NTP conditions
B. Air required for complete combustion of fuel with no excess air
C. Air required for optimum combustion so as to have reasonable excess air
D. Air required to convert CO into CO₂
Answer: Option B

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Question 1. Stoichiometric quantity of air is the
  1.     Air present in atmosphere at NTP conditions
  2.     Air required for complete combustion of fuel with no excess air
  3.     Air required for optimum combustion so as to have reasonable excess air
  4.     Air required to convert CO into CO₂
Answer: Option B
Question 2. The function of injector used in small capacity boilers is to
  1.     Create vacuum
  2.     Inject chemical solution in feed pump
  3.     Pump water, similar to boiler feed pump
  4.     Add make up water in the system
Answer: Option C
Question 3. The efficiency of reaction turbine is maximum when (where α = angle made by the absolute velocity ‘v’ at inlet)
  1.     Vb = 0.5 V cosα
  2.     Vb = V cos α
  3.     Vb = 0.5 V² cosα
  4.     Vb = V² cos α
Answer: Option B
Question 4. The efficiency of reaction turbine is maximum when (where α = angle made by the absolute velocity ‘v’ at inlet)
  1.     Vb = 0.5 V cosα
  2.     Vb = V cos α
  3.     Vb = 0.5 V² cosα
  4.     Vb = V² cos α
Answer: Option B
Question 5. The impulse reaction turbine has its driving force
  1.     As an impulsive force
  2.     As a reaction force
  3.     Partly as an impulsive force and partly as a reaction force
  4.     None of the above
Answer: Option C
Question 6. The function of injector used in small capacity boilers is to
  1.     Create vacuum
  2.     Inject chemical solution in feed pump
  3.     Pump water, similar to boiler feed pump
  4.     Add make up water in the system
Answer: Option C

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