Steam Boilers Engines Nozzles and Turbines

81. Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

1. increases
2. decreases
3. remains unaffected
4. first increases and then decreases
5. first decreases and then increases.

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82. On Millier chart, the constant pressure lines

1. diverge from left to right
2. diverge from right to left
3. are equally spaced throughout
4. first rise up and then fall
5. none of the above.

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83. On Mollier chart, flow through turbine is represented by '

1. horizontal straight line
2. vertical straight line
3. straight inclined line
4. curved line
5. none of the above.

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84. On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by

1. horizontal straight line
2. vertical straight line
3. straight inclined line
4. curved line
5. none of the above.

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85. One kg of steam sample contains 0.8 kg dry steam; it's dryness fraction is

1. 0.2
2. 0.8
3. 1
4. 0.6
5. 0.5.

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86. One kilowatt-hour energy is equivalent to

1. 1000 J
2. 360 kJ
3. 3600 kJ
4. 3600 kW/sec
5. 1000 kJ.

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87. Orsat meter is used for

1. gravimetric analysis of the flue gases
2. volumetric analysis of the flue gases
3. mass flow of the flue gases
4. measuring smoke density of flue gases
5. none of the above.

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88. Overfire burning is the phenomenon of

1. supply of excess, air
2. supply of excess coal
3. burning CO and unburnts in upper zone of furnace by supplying more air
4. fuel bed firing
5. none of the above.

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89. Pick up the correct statement as regards Cornish boiler and Lancashire boiler

1. cornish is fire tube and lancashire is water tube
2. cornish is water tube and lancashire is fire tube
3. cornish has two fire tubes and lancashire has one
4. lancashire has two fire tubes and cornish has one
5. both have two fire tubes.

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90. Pick up the wrong statement about critical condition of steam

1. latent heat is zero
2. liquid directly becomes steam
3. specific volume of steam and liquid is same
4. this is the maximum pressure limit
5. all properties of liquid and steam are same.

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