11. If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to
(a) Ps-Pa
(b) pa-ps
(C) Pa+P,
Ans: c
12. Equivalent evaporation is the amount of water evaporated in a boiler from and at
(a) 0°C
(b) 100°C
(c) saturation temperature at given pres¬sure
(d) room temperature
(e) 20°C.
Ans: b
13. The specific volume of steam with increase in pressure decreases
(a) linearly
(b) slowly first and then rapidly
(c) rapidly first and then slowly
(d) inversely
(e) none of the above.
Ans: c
14. The equivalent evaporation of a boiler is a measure to compare
(a) the given boiler with the model
(b) the two different boilers of the same make
(c) two different makes of boilers operating under the same operating conditions
(d) two boilers of same make but operaing under different conditions
(e) any type of boilers operating under any conditions.
Ans: e
15. The coal requirement per kW hour generation in the thermal power plant is of the order of
(a) 0.1 to 0.2 kg
(b) 0.2 to 0.4 kg
(c) 0.6 to 0.8 kg
(d) 1.0 to 1.5 kg
(e) 1.5 to 2 kg.
Ans: c
16. Sublimation region is the region where
(a) solid and vapour phases are in equilibrium
(b) solid and liquid phases are in equilibrium
(c) liquid and vapour phases are in equilibrium
(d) solid, liquid and vapour phases are in equilibrium
(e) none of the above.
Ans: a
17. Stoichiometric quantity of air is the
(a) air present in atmosphere at NTP conditions
(b) air required for complete combustion of fuel with no excess air
(c) air required for optimum combustion so as to have reasonable excess air
(d) air required to convert CO into C02
(e) air required to form an explosive mixture.
Ans: b
18. One kg of steam sample contains 0.8 kg dry steam; it's dryness fraction is
(a) 0.2
(b) 0.8
(c) 1.0
(d) 0.6
(e) 0.5.
Ans: b
19. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by
(a) throttling calorimeter
(b) separating calorimeter
(c) combined separating and throttling calorimeter
(d) bucket calorimeter
(e) none of the above.
Ans: a
20. If xx and x2 be the dryess fractions obtained in separating calorimeter and throttling calorimeter respectively, then the actual dryness fraction of steam will be
(a) xxx2
(b) x, + x2
Ans: a
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(a) Ps-Pa
(b) pa-ps
(C) Pa+P,
Ans: c
12. Equivalent evaporation is the amount of water evaporated in a boiler from and at
(a) 0°C
(b) 100°C
(c) saturation temperature at given pres¬sure
(d) room temperature
(e) 20°C.
Ans: b
13. The specific volume of steam with increase in pressure decreases
(a) linearly
(b) slowly first and then rapidly
(c) rapidly first and then slowly
(d) inversely
(e) none of the above.
Ans: c
14. The equivalent evaporation of a boiler is a measure to compare
(a) the given boiler with the model
(b) the two different boilers of the same make
(c) two different makes of boilers operating under the same operating conditions
(d) two boilers of same make but operaing under different conditions
(e) any type of boilers operating under any conditions.
Ans: e
15. The coal requirement per kW hour generation in the thermal power plant is of the order of
(a) 0.1 to 0.2 kg
(b) 0.2 to 0.4 kg
(c) 0.6 to 0.8 kg
(d) 1.0 to 1.5 kg
(e) 1.5 to 2 kg.
Ans: c
16. Sublimation region is the region where
(a) solid and vapour phases are in equilibrium
(b) solid and liquid phases are in equilibrium
(c) liquid and vapour phases are in equilibrium
(d) solid, liquid and vapour phases are in equilibrium
(e) none of the above.
Ans: a
17. Stoichiometric quantity of air is the
(a) air present in atmosphere at NTP conditions
(b) air required for complete combustion of fuel with no excess air
(c) air required for optimum combustion so as to have reasonable excess air
(d) air required to convert CO into C02
(e) air required to form an explosive mixture.
Ans: b
18. One kg of steam sample contains 0.8 kg dry steam; it's dryness fraction is
(a) 0.2
(b) 0.8
(c) 1.0
(d) 0.6
(e) 0.5.
Ans: b
19. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by
(a) throttling calorimeter
(b) separating calorimeter
(c) combined separating and throttling calorimeter
(d) bucket calorimeter
(e) none of the above.
Ans: a
20. If xx and x2 be the dryess fractions obtained in separating calorimeter and throttling calorimeter respectively, then the actual dryness fraction of steam will be
(a) xxx2
(b) x, + x2
Ans: a
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