At very low temperature, the melting and boiling temperatures become equal. This temperature is
373°K
273.16°K
303°K
0°K
Correct Answer :
B. 273.16°K
Related Questions
In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.
Equal to
Less than
More than
None of these
The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called
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Induced draught
Forced draught
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If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by
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Separating calorimeter
Combined separating and throttling calorimeter
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An impulse turbine as compared to a reaction turbine, for a given power has _________ row of blades.
Equal
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More
None of these
Lancashire boiler is a
Stationary fire tube boiler
Stationary water tube boiler
Water tube boiler with natural/forced circulation
Mobile fire tube boiler
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 briquettes
Feed water conditioning in thermal power plants in done to
Reduce hardness and for removal of solids
Increase efficiency of thermal power plant
Increase heat transfer rate
Increase steam parameters
An economiser is installed in a boiler primarily to
Superheat the steam
Reduce fuel consumption
Increase steam pressure
All of these
Clearance ratio is the ratio of
Clearance volume to the swept volume
Clearance volume to the volume at cut-off
Volume at cut-off to the swept volume
Swept volume to the clearance volume
A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as
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Fusible plug
Superheater
Stop valve
The turbine blades are
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Circular
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Alkaline pyrogallate is used in Orsat's apparatus for absorption of
CO₂
CO
O₂
N₂
The ratio of heat utilised to produce steam and the heat liberated in furnace is known as
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Boiler evaporative capacity
Factor of evaporation
Boiler efficiency
The selection of type and size of a steam boiler depends upon
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The geographical position of the power house
The fuel and water available
All of the above
The forced circulation of water does not take place in
LaMont boiler
Lancashire boiler
Velox boiler
Benson boiler
In a throttling process
Heat transfer takes place
Work is done by the expanding steam
Internal energy of steam changes
None of the above
The high pressure boiler is one, which produces steam at a pressure more than
Atmospheric pressure
5 kg/cm²
10 kg/cm²
7580 kg/cm²
Duplex feed pumps are used in small steam boilers. These operate on the principle of
Centrifugal pump
Axial flow pump
Gear pump
Reciprocating pump
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Inherent moisture and surface moisture are different things
In some coals moisture may be present up to 40%
Some moisture in coal helps in better burning which is not possible with completely dry coal
It increases thermal efficiency
The number of drums in Benson steam generator is
One
Two
One steam drum and one water drum
No drum
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23 %
30 %
40 %
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60 MW
100 MW
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Has no effect on
Decreases
Increases
None of these
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Lancashire boiler
Babcock and Wilcox boiler
Yarrow boiler
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Retards electric precipitation
Promotes complete combustion
Has highly corrosive effect
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Stationary < fire tube type
Horizontal type
Natural circulation type
All of the above
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Temperature only
Dryness fraction only
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100 tonnes/h
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175 tonnes/h
250 tonnes/h
At very low temperature, the melting and boiling temperatures become equal. This temperature is
373°K
273.16°K
303°K
0°K
The feed check valve is used in order to
Regulate flow of boiler water
Check level of water in boiler drum
Recirculate unwanted feed water
Allow high pressure feed water to flow to drum and not allow reverse flow to take place