Steam Boilers Engines Nozzles and Turbines

161. The safety valve at superheater as compared to drum safety valve setting is set at

  1. higher value
  2. lower value
  3. same value
  4. any value
  5. none of the above.

Correct answer: (B)
lower value

162. The safety valve on boiler drum compared to safety valve on superheater is set at

  1. same value
  2. higher value
  3. lower value
  4. lower/higher depending on steam flow
  5. unpredicatble.

Correct answer: (B)
higher value

163. The saturation temperature of steam with increase in pressure increases

  1. linearly
  2. rapidly first and then slowly
  3. slowly first and then rapidly
  4. inversely
  5. none of the above.

Correct answer: (B)
rapidly first and then slowly

164. The shell diameter and length of locomotive boiler are

  1. 1.5 m, 4 m
  2. 1.5 m, 6 m
  3. 1 m, 4 m
  4. 2 m, 4 m
  5. 1.5 m, 8 m.

Correct answer: (A)
1.5 m, 4 m

165. The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase

  1. increases
  2. decreases
  3. remains unchanged
  4. increases/decreases depending on steam temperature requirements
  5. unpredictable.

Correct answer: (B)
decreases

166. The specific heat of superheated steam in kcal/kg is generally of the order of

  1. 0.1
  2. 0.3
  3. 0.5
  4. 0.8
  5. 1.0.

Correct answer: (C)
0.5

167. The specific volume of steam with increase in pressure decreases

  1. linearly
  2. slowly first and then rapidly
  3. rapidly first and then slowly
  4. inversely
  5. none of the above.

Correct answer: (C)
rapidly first and then slowly

168. The state of vapour under saturation condition is described by

  1. pressure alone
  2. temperature alone
  3. pressure and temperature
  4. pressure and dryness fraction
  5. dryness fraction alone.

Correct answer: (D)
pressure and dryness fraction

169. The steam temperature with increase in load in case of a boiler fitted with radiation superheater

  1. increases
  2. decreases
  3. remains unaffected
  4. first increases and then decreases
  5. unpredictable.

Correct answer: (B)
decreases

170. 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.

Correct answer: (B)
above dew-point temperature of flue gases

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