Steam Boilers Engines Nozzles and Turbines

91. Pick up the wrong statement about water tube boiler in comparison to fire tube boilers

  1. former generates steam at high pressure
  2. former occupies less space for same power
  3. rate of steam flow is more in former case
  4. former is used for high installed capacity
  5. chances of explosion are less in former case.

Correct answer: (E)
chances of explosion are less in former case.

92. Pick up wrong statement about desired properties of a good fuel

  1. high calorific value
  2. produce minimum smoke and gases
  3. ease in storing
  4. high ignition point
  5. ecomomical

Correct answer: (D)
high ignition point

93. Pour point of fuel oil is the

  1. lowest temperature at which oil will flow under set condition
  2. storage temperature
  3. temperature at which fuel is pumped through burners
  4. temperature at which oil is transported
  5. none of the above.

Correct answer: (A)
lowest temperature at which oil will flow under set condition

94. Presence of moisture in fuel oil would

  1. keep the burner tips cool
  2. aid in proper combustion
  3. cause sputtering, possibly extinguishing flame
  4. clean the nozzles
  5. reduce flame length.

Correct answer: (C)
cause sputtering, possibly extinguishing flame

95. Primary air is the air used to

  1. provide air around burners for obtaining optimum combustion
  2. transport and dry the coal
  3. convert CO (formed in lower zone of furnace) into C02 at higher zone
  4. air-delivered by forced draft fan
  5. none ot the above.

Correct answer: (B)
transport and dry the coal

96. Proximate analysis of fuel is determination of percentage of

  1. carbon, hydrogen, nitrogen, sulphur, moisture
  2. fixed carbon, ash, volatile matter, moisture
  3. higher calorific value
  4. lower calorific value
  5. rough analysis.

Correct answer: (B)
fixed carbon, ash, volatile matter, moisture

97. Pulverised fuel is used for

  1. better burning
  2. more calorific value
  3. less radiation loss
  4. medium sized units
  5. stoker fired boilers.

Correct answer: (A)
better burning

98. Reheating of steam under ideal conditions takes place at constant

  1. entropy
  2. enthaply
  3. pressure
  4. temperature
  5. all of the above.

Correct answer: (D)
temperature

99. Relative percentage of heat absorbed through the heat transfer of
(i) furnace water wall,
(ii) boiler bank,
(Hi) superheater,
(iv) economiser,
(v) airheater of a typical boiler of 200 MW capacity would be of the order of

  1. 48:20:15:7:10
  2. 10:7:15:20:48
  3. 20:48:7:15:10
  4. 7:15:20:10:48
  5. 48:15:10:7:20.

Correct answer: (A)
48:20:15:7:10

100. Secondary air is the used to

  1. provide air around burners for obtaining optimum combustion
  2. transport and dry the coal
  3. convert CO (formed in lower zone of furnace) into C02 at higher zone
  4. air delivered by induced draft fan
  5. air fed to pulverisers.

Correct answer: (A)
provide air around burners for obtaining optimum combustion

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