Steam Boilers Engines Nozzles and Turbines

11. A wet vapour can be completely specified by

1. pressure only
2. temperature only
3. dryness fraction only
4. specific volume only
5. pressure and dryness fraction.

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12. Adiabatic process is

1. essentially an isentropic process
2. non-heat transfer process
3. reversible process
4. constant temperature process
5. constant enthalpy process.

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13. Alkaline pyrogallate is used in Orsat's apparatus for absorption of

1. C02
2. CO
3. 2
4. N2
5. none of the above.

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14. An economiser in a boiler

1. increases steam pressure
2. increases steam flow
3. decreases fuel consumption
4. decreases steam pressure
5. increases life of boiler.

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15. An ideal regenerative cycle is

1. equal to carnot cycle
2. less than carnot cycle
3. more than carnot cycle
4. could be anything
5. none of the above.

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16. At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is

1. maximum
2. minimum
3. zero
4. depends on temperature also
5. none of the above.

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17. At very low temperature, the melting and boiling temperatures become equal. This temperature is

1. 373°K
2. 273.16°K
3. 303°K
4. 0°K.
5. 300°K.

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18. At which pressure the properties of water and steam become identical

1. 0.1 kg/cm2
2. 1 kg/cm2
3. 100 kg/cm2
4. 225.6 kg/cm2
5. it is never possible.

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19. Boiler H.P. is defined as the

1. steam evaporation rate per kg of fuel fired
2. work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
3. the evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
4. work done by 1 kg of steam at saturation condition
5. heat consumed in evaporating 1 kg water at 0°C to steam at 100°C and 1.033 kg/cm pressure.

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20. Boiler parameters are expressed by

1. tonnes/hr. of steam
2. pressure of steam in kg/cm2
3. temperature of steam in °C
4. all of the above
5. none of the above.

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