Steam Boilers Engines Nozzles and Turbines

131. The diameters of fire tubes and superheaer tubes in locomotive boiler are

1. 47.5 mm, 130 mm
2. 32.5 mm, 180 mm
3. 65.5 mm, 210 mm
4. 24.5 mm, 65 mm
5. none of the above.

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132. The difference between cornish boiler and lancashire boiler is that

1. former is fire tube type and latter is water tube type boiler
2. former is water tube type and latter is fire tube type
3. former contains one fire tube and latter contains two fire tubes
4. none/of the above.
5. All above

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133. The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become

1. wet
2. superheated
3. remain dry saturated
4. dry
5. none of the above.

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134. The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become

1. wet
2. superheated
3. remain dry satruated
4. dry
5. none of the above.

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135. The economiser is used in boilers to

1. increase thermal efficiency of boiler
2. economise on fuel
3. extract heat from the exhaust flue gases
4. increase flue gas temperature
5. to heat feed water by bled steam.

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136. The equivalent evaporation of a boiler is a measure to compare

1. the given boiler with the model
2. the two different boilers of the same make
3. two different makes of boilers operating under the same operating conditions
4. two boilers of same make but operaing under different conditions
5. any type of boilers operating under any conditions.

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137. The evaporation of 15.653 kg of water per hour from and at 100°C is called

1. evaporative capacity
2. factor of evaporation
3. equivalent evaporation
4. one boiler h.p.
5. boiler efficiency.

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138. The feed check valve is used in order to

1. regulate flow of boiler water
2. check level of water in boiler drum
3. recirculate unwanted feed water
4. allow high pressure feed water to flow to drum and not allow reverse flow to take place
5. none of the above.

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139. The fire tubes in, a Coarran and Scotish marine boiler are

1. horizontal
2. vertical
3. inclined
4. both horizontal and vertical
5. horizontal and inclined.

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140. The function of injector used in small capacity boilers is to

1. create vacuum
2. inject chemical solution in feed pump
3. pump water, similar to boiler feed pump
4. add make up water in the system
5. none of the above.

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