Power Plant Engineering

21. For the safety of a steam boiler the number of safety valves fitted are

1. four
2. three
3. two
4. one

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22. For the same draught produced the power of induced draught fan as compared to forced draught fan is

1. less
2. more
3. same
4. not predictable

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23. In _________ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners

1. unit
2. central
3. none of the above
4. all of the above

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24. In a boiler installation the natural draught is produced

1. due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in
2. due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column
3. due to the fact that at the chimney top the pressure is more than its environmental pressure
4. all of the above

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25. In a regenerative feed heating cycle, the greatest economy is affected

1. when steam is extracted from only one suitable point of steam turbine
2. when steam is extracted from several places in different stages of steam turbine
3. when steam is extracted only from the last stage of steam turbine
4. when steam is extracted only from the first stage of steam turbine

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26. In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating

1. decreases with increase in Rankine cycle efficiency
2. increases with increase in Rankine cycle efficiency
3. is unaffected by increase in Rankine cycle efficiency
4. none of the above

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27. In a regenerative surface condenser

1. there is one pump to remove air and condensate
2. there are two pumps to remove air and condensate
3. there are three pumps to remove air, vapour and condensate
4. there is no pump, the condensate gets removed by gravity

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28. In a shell and tube surface condenser

1. steam and cooling water mix to give the condensate
2. cooling water passes through the tubes and steam surrounds them
3. steam passes through the cooling tubes and cooling water surrounds them
4. all of the above varying with situation

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29. In a steam power plant, the function of a condenser is

1. to maintain pressure below atmospheric to increase work output from the primemover
2. to receive large volumes of steam exhausted from steam prime mover
3. to condense large volumes of steam to water which may be used again in boiler
4. all of the above

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30. In a surface condenser if air is removed, there is

1. fall in absolute pressure maintained in condenser
2. rise in absolute pressure maintained in condenser
3. no change in absolute pressure in the condenser
4. rise in temperature of condensed steam

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