Fuels and Combustion MCQs

469 MCQs  — Chemical Engineering MCQs  (Page 21 of 47)

Attempt Fuels and Combustion Quiz
C.V. (kcal/Nm3) of gaseous fuels _____________ with increase in molecular weight?
A. Decreases
B. Increases
C. Remain constant
D. May increase or decrease, depends on combustibles
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Fuel for a fast breeder nuclear reactor is____________________?
A. Plutonium
B. Uranium
C. Radium
D. Neptunium
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Actual flame temperature is always lower than the adiabatic flame temperature, because there is________________?
A. No possibility of obtaining complete combustion at high temperature
B. Always loss of heat from the flame
C. Both a. and b.
D. Neither a. nor b.
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‘Fuel’ can be defined as a substance which produces heat by___________________?
A. Combustion
B. Nuclear fission
C. Nuclear fusion
D. All a., b. & c.
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Bomb calorimeter is used to determine the (where, GCV – Gross Calorific Value. NCV – Net Calorific Value.) ?
A. Gcv at constant pressure
B. Gcv at constant volume
C. Ncv at constant pressure
D. Ncv at constant volume
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Narrow coke ovens as compared to wider coke ovens_________________?
A. Produce smaller coke
B. Produce stronger coke
C. Require less time of carbonisation
D. All a., b. and c.
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Coal containing large quantity of _______________ are difficult to wash?
A. Ash
B. Inherent mineral matter
C. Free impurities
D. Volatile matter
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The temperature at which plastic layer formation takes place during carbonisation of coal varies from ______________ °C ?
A. 100 to 150
B. 350 to 450
C. 550 to 650
D. 700 to 850
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Preheating of combustion air is done to ___________________?
A. Increase the adiabatic flame temperature
B. Increase the calorific value of the fuel
C. Complete the combustion of fuel
D. Reduce its requirement for effecting the complete combustion
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‘Mixed gas’ used in steel plants is a mixture of___________________?
A. B.f. gas and coke oven gas
B. Coke oven gas and converter gas
C. Coke oven gas and l.p.g
D. Blast furnace gas and naphtha vapor
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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