Q.1
During coking of coal, the ash content (percentage)
Q.2
Abel apparatus is used for those oils, whose flash points are___°F.
Q.3
Pick out the wrong statement.
Q.4
With increase in moisture content of coal, its
Q.5
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is
Q.6
Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.
Q.7
Oxygen percentage (by weight) in atmospheric air is
Q.8
Sometimes water is sprayed during coal charging in the coke oven, which helps in
Q.9
High rate of heating of coke ovens
Q.10
Pick out the wrong statement.
Q.11
Very __________ coals are completely devoid of cokability i.e, it is non coking.
Q.12
Preheating of __________ the flame temperature.
Q.13
The main drawback of supplying more excess air in the combustion of fuel is the
Q.14
Which of the following fuel gases has the highest calorific value ?
Q.15
By-products are __________ recovered in 'Beehive ovens'.
Q.16
Naphthalene is removed from coke oven gas by
Q.17
Low temperature oxidation of stored coal results in the
Q.18
Adiabatic flame temperature of a fuel is dependent on the initial temperature of
Q.19
L.D. converter gas (produced in steel plant) comprises mainly of
Q.20
Which of the following fuel gases is heavier than air?
Q.21
Low temperature carbonisation of coal takes place at __________ °C.
Q.22
High temperature carbonisation of coal takes place at __________ °C.
Q.23
Actual flame temperature is always lower than the adiabatic flame temperature, because there is
Q.24
Stack heat losses can be minimised by
Q.25
The gas which contributes maximum to the heating value of natural gas is
Q.26
Which of the following has the highest calorific value?
Q.27
Which of the following coke has the least percentage of ash?
Q.28
__________ of the coal is the basis for Seylor's coal classification.
Q.29
Low temperature oxidation of coal during storage does not decrease its
Q.30
The heat of combustion of a fuel
Q.31
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always
Q.32
While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at
Q.33
The maximum adiabatic flame temperature is attained, when the fuel is burnt with
Q.34
Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO₂, 20%CO and 10%O₂. The percent excess oxygen used is
Q.35
Which of the following is not a product of tar distillation?
Q.36
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.
Q.37
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has
Q.38
The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always
Q.39
Natural draft created by the chimney depends upon
Q.40
The cooling medium used in dry quenching of coke is
Q.41
Compound coke ovens are those which can be heated by
Q.42
Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)
Q.43
Which of the following is a measure of the agglutinating (i.e., binding) property of coal?
Q.44
To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in
Q.45
Which of the following is not applicable to fluidised bed combustion of coal?
Q.46
Size of blast furnace grade coke is __________ mm.
Q.47
Steam is intermittently admitted into the fuel bed during the production of producer gas to
Q.48
As the equilibrium moisture content of the coal increases, its
Q.49
Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel) ?
Q.50
Use of excess of combustion air in the combustion of fuels results in
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