Steam Boilers

1. 02 content in atmospheric air on volume basis is

1. 21%
2. 23%
3. 30%
4. 40%
5. 70%.

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2. 02 content in atmospheric air on weight basis is

1. 21%
2. 23%
3. 30%
4. 40%
5. 70%.

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3. 1 kg.m is equal to

1. 9.81 Joules
2. All Joules
3. 427 Joules
4. 102 Joules
5. 539 Joules.

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4. 100% efficiency of a thermal cycle cannot be achieved because of

1. frictional losses
2. it is not possible to achieve 0°K temperature
3. leakage
4. non-availability of ideal substance
5. none of the above.

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5. A boiler in India should conform to safety regulations of

1. DIN
2. BS
3. ASTM
4. IBR
5. GOST.

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6. A fusible plug is fitted in small boilers in order to

1. avoid excessive build up of pressure
2. avoid explosion
3. extinguish fire if water level in the boiler falls below alarming limit
4. control steam dome
5. remove molten aslj.

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7. A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

1. supplied by same manufacturer loose and assembled at site
2. supplied mounted on a single base
3. purchased from several parties and packed together at site
4. packaged boiler does not exist
5. none of the above.

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8. A safety valve in a locomotive starts leaking. The leaking medium will be

1. water
2. dry steam
3. wet steam
4. super heated steam
5. supersaturated steam.

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9. A supercritical boiler is one that operates above the pressure and temperature of following values

1. 100 kg/cm2 and 540°C
2. 1 kg/cm2 and 100°C
3. 218 kg/cm2 abs and 373°C
4. 218 kg/cm2 abs and 540°C
5. 100 kg/cm2 abs and 373°C

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10. 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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