Power Plant Engineering In Ee(Electrical Engineering ) Questions and Answers

Question 1. Rankine efficiency of a steam power plant
  1.    improves in summer as compared to that in winter
  2.    improves in winter as compared to that in summer
  3.    is unaffected by climatic conditions
  4.    none of the above
Explanation:-
Answer: Option B. -> improves in winter as compared to that in summer
Question 2. In a boiler installation the natural draught is produced
  1.    due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in
  2.    due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column
  3.    due to the fact that at the chimney top the pressure is more than its environmental pressure
  4.    all of the above
Explanation:-
Answer: Option B. -> due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column
Question 3. The artificial draught normally is designed to produce
  1.    less smoke
  2.    more draught
  3.    less chimney gas temperature
  4.    all of the above
Explanation:-
Answer: Option D. -> all of the above
Question 4. In jet type condensers
  1.    cooling water passes through tubes and steam surrounds them
  2.    steam passes through tubes and cooling water surrounds them
  3.    steam and cooling water mix
  4.    steam and cooling water do not mix
Explanation:-
Answer: Option C. -> steam and cooling water mix
Question 5. In a regenerative feed heating cycle, the greatest economy is affected
  1.    when steam is extracted from only one suitable point of steam turbine
  2.    when steam is extracted from several places in different stages of steam turbine
  3.    when steam is extracted only from the last stage of steam turbine
  4.    when steam is extracted only from the first stage of steam turbine
Explanation:-
Answer: Option B. -> when steam is extracted from several places in different stages of steam turbine
Question 6. Parson's turbine is
  1.    pressure compounded steam turbine
  2.    simple single wheel, impulse steam turbine
  3.    simple single wheel reaction steam turbine
  4.    multi wheel reaction steam turbine
Explanation:-
Answer: Option D. -> multi wheel reaction steam turbine
Question 7. Binary vapor cycles are used to
  1.    Increase the performance of the condenser
  2.    Increase the efficiency of the plant
  3.    Increase efficiency of the turbine
  4.    None of the above
Explanation:-
Answer: Option B. -> Increase the efficiency of the plant
Question 8. Secondary air is the air used to
  1.    reduce the flame length
  2.    increase the flame length
  3.    transport and dry the coal
  4.    provide air round the burners for getting optimum combustion
Explanation:-
Answer: Option D. -> provide air round the burners for getting optimum combustion
Question 9. The value of the reheat factor is of the order of
  1.    0.8 to 1.0
  2.    1.0 to 1.05
  3.    1.1 to 1.5
  4.    above 1.5
Explanation:-
Answer: Option C. -> 1.1 to 1.5
Question 10. Rankine cycle operating on low pressure limit of p1 and high pressure limit of p2
  1.    Has higher thermal efficiency than the Carnot cycle operating between same pressure limits
  2.    Has lower thermal efficiency than Carnot cycle operating between same pressure limit
  3.    Has same thermal efficiency as Carnot cycle operating between same pressure limits
  4.    May be more or less depending upon the magnitude of p1 and p2
Explanation:-
Answer: Option A. -> Has higher thermal efficiency than the Carnot cycle operating between same pressure limits
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