Related Questions

Gross heating value of coal is __________ the net heating value.
A Higher than
B Lower than
C Same as
D None of these
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
A 1000
B 4000
C 6000
D 8000
Which of the following does not require preheating during storage in the storage tank as well as during atomisation through burners?
A PCM
B Tar
C Light diesel oil
D Low viscosity furnace oil
In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating
A Decreases with increase in Rankine cycle efficiency
B Increases with increase in Rankine cycle efficiency
C Is unaffected by increase in Rankine cycle efficiency
D None of the above
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
A Neutralised by alkali treatment
B Left as such without any treatment
C Diluted with fresh water to reduce its acidity
D None of these
The low heating capacity of which of the types of coal reduces its value as an industrial fuel?
A Anthracite
B Bituminous coal
C Lignite
D Peat
Weathering of coal during storage causes
A Reduction in coal size
B Increase in its friability
C Decrease in its caking capacity
D All of the above
Low temperature oxidation of coal during storage does not decrease its
A Oxygen content
B Caking power
C Calorific value
D None of these
Heating wet steam at constant temperature is heating it at constant
A Volume
B Pressure
C Entropy
D Enthalpy
In resistance heating highest working temperature is obtained from heating elements made of
A Nickel copper
B Nichrome
C Silicon carbide
D Silver

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