Power Plant Engineering(Engineering > 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. 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 3. 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 4. 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 5. 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 6. In De Laval steam turbine
  1.    the pressure in the turbine rotor is approximately same as in condenser
  2.    the pressure in the turbine rotor is higher than pressure in the condenser
  3.    the pressure in the turbine rotor gradually decreases from inlet to exit from condenser
  4.    none from the above
Explanation:-
Answer: Option A. -> the pressure in the turbine rotor is approximately same as in condenser
Question 7. In ______ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners
  1.    unit
  2.    central
  3.    power
  4.    none of the above
Explanation:-
Answer: Option B. -> central
Question 8. The draught produced by chimney of given height at given outside temperature
  1.    decreases if the chimney gas temperature increases
  2.    increases if the chimney gas temperature increases
  3.    remains same irrespective of chimney gas temperature
  4.    may increase or decrease
Explanation:-
Answer: Option B. -> increases if the chimney gas temperature increases
Question 9. Compounding of steam turbine is done for
  1.    reducing the work done
  2.    increasing the rotor speed
  3.    reducing the rotor speed
  4.    balancing the turbine
Explanation:-
Answer: Option C. -> reducing the rotor speed
Question 10. In Rankine cycle the work output from the turbine is given by
  1.    change of internal energy between inlet and outlet
  2.    change of enthaply between inlet and outlet
  3.    change of entropy between inlet and outlet
  4.    change of temperature between inlet and outlet
Explanation:-
Answer: Option B. -> change of enthaply between inlet and outlet
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