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MCQs

Total Questions : 1935 | Page 193 of 194 pages
Question 1921. In designing air preheater, the important design consideration is that_________________?
  1.    approach temperature should be as low as possible
  2.    handling and maintenance should be easier
  3.    heat transfer area should be optimum
  4.    stack gases should not be cooled to the dew point
  5.    none of the above
 Discuss Question
Answer: Option D. -> stack gases should not be cooled to the dew point
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1922. The temperature of flue gases at air heater outlet should be__________________?
  1.    100°C
  2.    above dew-point temperature of flue gases
  3.    below dew-point temperature of flue gases
  4.    less than wet bulb temperature of flue gases
  5.    above wet bulb temperature of flue gases
 Discuss Question
Answer: Option B. -> above dew-point temperature of flue gases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1923. In a recuperative air preheater, the heat is transferred____________________?
  1.    from a metal wall from one medium to another
  2.    from heating an itermediate material and then heating the air from this material
  3.    by direct mixing
  4.    heat is transferred by bleeding some gases from furnace
  5.    none of the above
 Discuss Question
Answer: Option A. -> from a metal wall from one medium to another
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1924. With increase in load, convection superheater has_______________________?
  1.    drooping characteristic
  2.    linear characterisstic
  3.    rising characteristic
  4.    flat characteristic
  5.    none of the above
 Discuss Question
Answer: Option C. -> rising characteristic
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1925. In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine__________________?
  1.    lancashire boiler
  2.    locomotive boiler
  3.    babcock and wilcox boiler
  4.    cochran boiler
  5.    benson boiler
 Discuss Question
Answer: Option B. -> locomotive boiler
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1926. The heat loss in a boiler takes place in the form of________________?
  1.    heat carried away by flue gases
  2.    heat carried away by ash
  3.    moisture present in fuel and steam formed by combustion of hydrogen in fuel
  4.    radiation
  5.    all of the above
 Discuss Question
Answer: Option E. -> all of the above
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1927. In forced circulation type boiler__________________?
  1.    heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
  2.    water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixtur
  3.    feed pump is employed to supplement natural circulation in water wall type furnace
  4.    water is converted into steam in one pass without any recirculation
  5.    water is heated in a large number of tubes
 Discuss Question
Answer: Option D. -> water is converted into steam in one pass without any recirculation
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1928. Thermal efficiency of a thermal power plant is of the order of___________________?
  1.    15%
  2.    20%
  3.    30%
  4.    45%
  5.    60%
 Discuss Question
Answer: Option C. -> 30%
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1929. The overall efficiency of thermal power plant is________________?
  1.    boiler efficiency, turhine efficiecny, generator efficiency
  2.    all the three above plus gas cycle efficiency
  3.    carnot cycle efficiency
  4.    regenerative cycle efficiency
  5.    rankine cycle efficiency
 Discuss Question
Answer: Option A. -> boiler efficiency, turhine efficiecny, generator efficiency
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1930. The radius of a dished head is taken approximately as______________________?
  1.    one-fourth
  2.    half
  3.    one
  4.    two
  5.    three
 Discuss Question
Answer: Option C. -> one
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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