Steam Boilers and Turbines Online practice Questions Test1

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1. For water, at pressures below atmospheric,
melting point rises slightly and boiling point drops markedly	melting point rises markedly and boiling point drops markedly
melting point drops slightly and boiling point drops markedly	melting point drops slightly and boiling point drops slightly

2. At very low temperature, the melting and boiling temperatures become equal. This temperature is ______.
373°K	273.16°K
303°K	300°K

3. The critical pressure at which latent heat of vaporisation is zero is _____.
225.65 kgf/cm2	273 kgf/cm2
100 kgf/cm2	1 kgf/cm2

4. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is _____.
less	more
equal	may be less or more depending on temperature

5. The saturation temperature of steam with increase in pressure increases
linearly	rapidly first and then slowly
slowly first and then rapidly	inversely

6. Carbonisation of coal is the process of ______.
pulverising coal in inert atmosphere	heating wood in a limited supply of air at temperatures below 300°C
strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel	binding the pulverised coal into brickettes

7. Coke is produced by _____.
pulverising coal in inert atmosphere	heating wood in a limited supply of air at temperatures below 300GC
strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel	binding the pulverised coal into brick-etts

8. Heating of dry steam above saturation temperature is known as _____.
enthalpy	superheating
supersaturation	latent heat

9. Superheating of steam is done at _____.
constant volume	constant temperature
constant pressure	constant entropy

10. 1 kg.m is equal to _____.
9.81 Joules	All Joules
427 Joules	102 Joules

11. If partial pressure of air and steam be pa andps respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to _____.
Ps-Pa	pa-ps
Pa+P	All of the Above

12. Equivalent evaporation is the amount of water evaporated in a boiler from and at _____.
0°C	100°C
saturation temperature at given pressure	room temperature

13. The specific volume of steam with increase in pressure decreases
linearly	slowly first and then rapidly
rapidly first and then slowly	inversely

14. The equivalent evaporation of a boiler is a measure to compare
the given boiler with the model	the two different boilers of the same make
two different makes of boilers operating under the same operating conditions	any type of boilers operating under any conditions

15. The coal requirement per kW hour generation in the thermal power plant is of the order of
0.1 to 0.2 kg	0.2 to 0.4 kg
0.6 to 0.8 kg	1.0 to 1.5 kg

16. Sublimation region is the region where
solid and vapour phases are in equilibrium	solid and liquid phases are in equilibrium
liquid and vapour phases are in equilibrium	solid, liquid and vapour phases are in equilibrium

17. Stoichiometric quantity of air is the _____.
air present in atmosphere at NTP conditions	air required for complete combustion of fuel with no excess air
air required for optimum combustion so as to have reasonable excess air	air required to convert CO into C02

18. One kg of steam sample contains 0.8 kg dry steam; it's dryness fraction is ____.
0.2	0.8
1.0	0.6

19. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by _____.
throttling calorimeter	separating calorimeter
combined separating and throttling calorimeter	bucket calorimeter

20. The specific heat of superheated steam in kcal/kg is generally of the order of ____.
0.1	0.3
0.5	0.8