octane number.
lead susceptibility.
gum forming tendency & thoroughness of refining.
none of these.
✅ The correct answer is option C.
Chemical Engineering MCQs
Nusselt number is the ratio of the
Temperature gradient of the wall to that across the entire pipe
Temperature difference to the temperature gradient at the wall
Heat flux at the wall to that across the entire pipe
None of these
✅ The correct answer is option C.
The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are
(COP)R = (COP)HP = 0.6
(COP)R = 2.5; (COP)HP = 1.5
(COP)R = 1.5; (COP)HP = 2.5
(COP)R = (COP)HP = 2.5
✅ The correct answer is option C.
Sweetening of petroleum product means the removal of
sulphur & its compounds
water
organic impurities
wax
✅ The correct answer is option A.
The most important property for a jet fuel is its
viscosity
freezing point
calorific value
flash point
✅ The correct answer is option B.
Use of excess of combustion air in the combustion of fuels results in
Heat losses
Long flame
Condensation of water vapour from the fuel gas
None of these
✅ The correct answer is option A.
Which is the most suitable for cold viscous feed?
Forward feed
Backward feed
Mixed feed
Parallel feed
✅ The correct answer is option B.
In case of evaporators, liquid entrainment results primarily due to
High vacuum in the evaporator
High evaporation rate
Foaming of the solution
High heat transfer rate
✅ The correct answer is option C.
Dearomatisation of kerosene (by liquid sulphur dioxide extraction) is done to
increase its smoke point.
improve its oxidation stability.
decrease the breathing loss.
none of these.
✅ The correct answer is option B.
The pressure (kg/cm2 ) and temperature (°C) maintained in electrical desalters for crude oil are respectively
10 and 120
1 and 200
50 and 250
10 and 300
✅ The correct answer is option A.