2791. The optimum percentage of excess air for combustion depends upon the __________ of the fuel.
Type (solid, liquid or gaseous)
Calorific value
Sulphur content
Ignition temperature
✅ The correct answer is option A.
Chemical Engineering
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2792. Ratio of primary air to secondary air increases with increase in the rank of coal, because the
High rank coals have higher amount of volatile matter
Ratio of fixed carbon to volatile matter increases
Oxygen content progressively decreases
Calorific value of the coal increases
✅ The correct answer is option B.
2793. The main aim of cracking is to produce
gasoline
lube oil
petrolatum
coke
✅ The correct answer is option A.
2794. Which of the following has the highest gum forming tendency in gosoline ?
Paraffins
Diolefins
Aromatics
Naphthenes
✅ The correct answer is option B.
2795. Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is
200 °F
200 °C
200 °K
200 °R
✅ The correct answer is option A.
2796. The catalytic cracking of heavier petroleum fraction is done to produce mainly
gasoline
asphalt
diesel oil
tar
✅ The correct answer is option C.
2797. Petroleum deposits are detected by the.
oil seepage at the surface of the earth.
measuremet of density, elasticity and magnetic & electric properties of the rock in the crust of the earth.
age & nature of rocks inside the crust of the earth.
all (a), (b) and (c)
✅ The correct answer is option D.
2798. Crude topping column operates at __________ pressure.
atmospheric
10 atm
vacuum
3 atm.
✅ The correct answer is option A.
2799. Which of the following categories of gasoline has the highest lead susceptibility ?
Straight run gasoline
Platinum reformed gasoline
Catalytical cracked gasoline
Polymer gasoline
✅ The correct answer is option A.