2671. Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.
50
1000
5000
10000
✅ The correct answer is option A.
Chemical Engineering
Prepare with the best Chemical Engineering MCQs with answers and detailed explanations for exams and job tests. Our collection covers key topics such as chemical process calculations, thermodynamics, fluid mechanics, heat transfer, mass transfer, reaction engineering, instrumentation, and plant design. These Chemical Engineering multiple-choice questions are ideal for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and job interviews. Practice online with updated Chemical Engineering MCQs to strengthen your concepts and improve technical problem-solving skills.
2672. Pick out the undesirable property for a solvent meant for dewaxing of lube oil.
Complete miscibility with oil.
High solubility of wax in the solvent.
Both (a) and (b).
Neither (a) nor (b).
✅ The correct answer is option C.
2673. Bomb calorimeter is used for the determination of calorific value of the __________ fuels.
Gaseous
Solid
Liquid
Both B and C
✅ The correct answer is option D.
2674. Higher viscosity of lubricating oil usually signifies
lower Reid vapour pressure.
higher acid number.
higher flash point and fire point.
lower flash point and fire point.
✅ The correct answer is option C.
2675. The main use of heavy gas oil produced by the vacuum distillation unit is as a
blending component for kerosene.
blending component for petrol.
feedstock for fluid catalytic cracking unit.
none of these.
✅ The correct answer is option C.
2676. Hydrogen percentage (by weight) in crude petroleum may be about
5
15
25
35
✅ The correct answer is option B.
2677. A coal containing high amount of volatile matter will have
Low ignition temperature
Very little ash content
High fusion point of its ash
Low adiabatic flame temperature
✅ The correct answer is option A.
2678. Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has
high pour point and low smoke point.
low viscosity index.
high self-ingnition temperature.
all (a), (b) and.(c).
✅ The correct answer is option B.
2679. Which is the most effective catalyst used in catalytic cracking of petroleum products ?
Iron oxide
Nickel
Vanadium pentoxide
Zeolite
✅ The correct answer is option D.
2680. Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.
30
65
120
180
✅ The correct answer is option B.