Steam Boilers Engines Nozzles and Turbines

71. 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.

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72. Incomplete combustion can be best judged by

1. smoky chimney exit
2. excess air in flue gases
3. measuring carbon mono-oxide in flue gases
4. measuring temperature of flue gases at exit of furnace
5. measuring oxygen in flue gases.

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73. It is required to produce large amount of steam at low pressure. Which boiler should be used ?

1. pulverised fuel fired boiler
2. cochran boiler
3. lancashire boiler
4. babcock and wilcox boiler
5. stoker fired boiler.

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74. Lancashire 'boiler is a

1. stationary fire tube boiler
2. stationary water tube boiler
3. water tube boiler with natural/forced circulation
4. mobile fire tube boiler
5. none of the above.

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75. Lancashire boiler is of

1. stationary<fire tube-type
2. horizontal type
3. natural cirulation type
4. internally fired type
5. all of the above.

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76. Latent heat of dry steam at atmospneric pressure is equal to

1. 539 kcal/kg
2. 539 BTU/lb
3. 427 kcal/kg
4. 100 kcal/kg
5. 471 kcal/kg.

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77. Locomotive boiler is of the following type

1. multitubular
2. horizontal
3. internally fired
4. mobile
5. all of the above.

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78. Locomotive type' boiler is

1. horizontal multitubular water tube boiler
2. water wall enclosed furnace type
3. vertical tubular fire tube type
4. horizontal multi-tubular fire tube type
5. none of the above types.

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79. Maximum energy loss in a boiler occurs due to

1. unburnt carbon in ash
2. incomplete combustion
3. ash content
4. flue gases
5. radiation losses.

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80. Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to

1. 421 kgm
2. 421 kgm
3. 539 kgm
4. 102 kgm
5. 75 kgm.

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