Q.1
High ash coals
Q.2
Gray-King Assay and Roga Index of coal is a measure of its
Q.3
Which of the following is a rich fuel gas?
Q.4
In low temperature carbonisation (as compared to high temperature carbonisation) of coal
Q.5
The main function of primary air in pulverised coal fired burner is to
Q.6
A coal with high __________ content, would ignite most easily.
Q.7
Main constituents of purified Lurgi gas are
Q.8
Cannel coal and boghead coal are the examples of
Q.9
Preheating of coal charge for the coke ovens reduces the
Q.10
Fossil fuels mean
Q.11
Shatter index of the coke is a measure of its
Q.12
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.
Q.13
Turndown ratio of a gas burner is equal to the
Q.14
__________ process is meant for direct hydrogenation of coal to produce liquid fuel.
Q.15
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?
Q.16
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.
Q.17
Preheating of a gaseous fuel results in increased
Q.18
The shift conversion reaction taking place during water gas manufacture is given by
Q.19
Froth floatation is used for
Q.20
'Fat' coal means a coal having
Q.21
Advantages of fluidised bed combustion are
Q.22
Which of the following gaseous fuels has the highest net calorific value (kcal/Nm³)?
Q.23
In high temperature carbonisation (as compared to low temperature carbonisation) of coal
Q.24
A gaseous fuel in order to develop luminousity on burning, must contain
Q.25
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.
Q.26
Washing of coal
Q.27
Presence of nitrogen in combustion air does not reduce the
Q.28
Air/gas ratio for complete combustion will be the highest for
Q.29
Washing of coal
Q.30
Washing of coal decreases its
Q.31
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?
Q.32
Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?
Q.33
Softening temperature of coal ash is a measure of the __________ of coal.
Q.34
Main constituent of the gas produced from a gobar gas plant is
Q.35
Which is the heaviest fuel gas out of the following?
Q.36
Bomb calorimeter is used for the determination of calorific value of the __________ fuels.
Q.37
Which of the following coal gasification processes will produce gas having maximum methane content?
Q.38
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be
Q.39
Gross calorific value will be equal to the net calorific value for
Q.40
Lurgi coal gasifier is a pressurised __________ bed reactor.
Q.41
Which of the following fuels is the best for burning on chain grate stoker?
Q.42
In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing
Q.43
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher
Q.44
By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of
Q.45
Junker's calorimeter is used to determine the calorific value of
Q.46
A fuel with high heat release rate will
Q.47
Power alcohol as compared to straight run gasoline has lower
Q.48
Which of the following petrographic constituents of coal is non-coking?
Q.49
Caking index of coal blend used for blast furnace coke making is about
Q.50
Purity of coke means that, it is high in carbon and low in
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