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MCQs

Total Questions : 70 | Page 7 of 7 pages
Question 61. The value of reheat factor normally varies from
  1.    0.5 to 0.6
  2.    0.9 to 0.95
  3.    1.02 to 1.06
  4.    1.2 to 1.6
 Discuss Question
Answer: Option C. -> 1.02 to 1.06
Question 62. The critical pressure ratio of a convergent nozzle is defined as
  1.    the ratio of outlet pressure to inlet pressure of nozzle
  2.    the ratio of inlet pressure to outlet pressure of nozzle
  3.    the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is min-imum
  4.    the ratio of outlet pressure to inlet pressure only when mass flow rate = c
 Discuss Question
Answer: Option D. -> the ratio of outlet pressure to inlet pressure only when mass flow rate = c
Question 63. In fuel cell, the ______ energy is converted into electrical energy.
  1.    mechanical
  2.    chemical
  3.    heat
  4.    sound
 Discuss Question
Answer: Option B. -> chemical
Question 64. Caking coals are those which
  1.    burn completely
  2.    burn freely
  3.    do not form ash
  4.    form lumps or masses of coke
 Discuss Question
Answer: Option D. -> form lumps or masses of coke
Question 65. TravelUng grate stoker can burn coals at the rates of
  1.    50 - 75 kg/m per hour
  2.    75 - 100 kg/m per hour
  3.    100— - kg/m per hour
  4.    150 - 200 kg/m² per hour
 Discuss Question
Answer: Option D. -> 150 - 200 kg/m² per hour
Question 66. For forced draught system, the function of chimney is mainly
  1.    to produce draught to accelerate the combustion of fuel
  2.    to discharge gases high up in the atmosphere to avoid hazard
  3.    to reduce the temperature of the hot gases discharged
  4.    none of the above
 Discuss Question
Answer: Option B. -> to discharge gases high up in the atmosphere to avoid hazard
Question 67. In a steam power plant, the function of a condenser is
  1.    to maintain pressure below atmospheric to increase work output from the primemover
  2.    to receive large volumes of steam exhausted from steam prime mover
  3.    to condense large volumes of steam to water which may be used again in boiler
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 68. For the same draught produced the power of induced draught fan as compared to forced draught fan is
  1.    less
  2.    more
  3.    same
  4.    not predictable
 Discuss Question
Answer: Option B. -> more
Question 69. The commercial sources of energy are
  1.    solar, wind and biomass
  2.    fossil fuels, hydropower and nuclear energy
  3.    wood, animal wastes and agriculture wastes
  4.    none of the above
 Discuss Question
Answer: Option B. -> fossil fuels, hydropower and nuclear energy
Question 70. The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation
  1.    pvls=C
  2.    pv1126 = C
  3.    pv1A = C
  4.    pv = C
 Discuss Question
Answer: Option A. -> pvls=C

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