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MCQs

Total Questions : 70 | Page 3 of 7 pages
Question 21. The amount of air which is supplied for complete combustion is called
  1.    primary air
  2.    secondary air
  3.    tertiary air
  4.    none of the above
 Discuss Question
Answer: Option B. -> secondary air
Question 22. Reheat factor is the ratio of
  1.    isentropic heat drop to useful heat drop
  2.    adiabatic heat drop to isentropic heat drop
  3.    cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop
  4.    none of the above
 Discuss Question
Answer: Option C. -> cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop
Question 23. Curtis turbine is
  1.    reaction steam turbine
  2.    pressure velocity compounded steam turbine
  3.    pressure compounded impulse steam turbine
  4.    velocity compounded impulse steam turbine
 Discuss Question
Answer: Option B. -> pressure velocity compounded steam turbine
Question 24. Mercury is a choice with steam in binary vapour cycle because it has
  1.    higher critical temperature and pressure
  2.    higher saturation temperature than other fluids
  3.    relatively low vapourisation pressure
  4.    all above
 Discuss Question
Answer: Option D. -> all above
Question 25. In regenerative cycle feed water is heated by
  1.    exhaust gases
  2.    heaters
  3.    draining steam from the turbine
  4.    all above
 Discuss Question
Answer: Option C. -> draining steam from the turbine
Question 26. The energy radiated by sun on a bright sunny day is approximately
  1.    700 W/m²
  2.    800 W/m²
  3.    1 kW/m²
  4.    2 kW/m²
 Discuss Question
Answer: Option C. -> 1 kW/m²
Question 27. The average ash content in Indian co als is about
  1.    5%
  2.    10%
  3.    15%
  4.    20%
 Discuss Question
Answer: Option D. -> 20%
Question 28. The main source of production of biogas is
  1.    human waste
  2.    wet cow dung
  3.    wet livestock waste
  4.    all above
 Discuss Question
Answer: Option D. -> all above
Question 29. Deaerative heating is done to
  1.    Heat the water
  2.    Heat the air in the water
  3.    Remove dissolved gases in the water
  4.    None of these
 Discuss Question
Answer: Option C. -> Remove dissolved gases in the water
Question 30. Regenerative cycle thermal efficiency
  1.    is always greater than simple Rankine thermal efficiency
  2.    is greater than simple Rankine cycle thermal efficiency only when steam is bled at particu-lar pressure
  3.    is same as simple Rankine cycle thermal efficiency
  4.    is always less than simple Rankine cycle thermal efficiency
 Discuss Question
Answer: Option A. -> is always greater than simple Rankine thermal efficiency

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