A. Hydrogen
B. Oxygen
C. Volatile matter
D. Fixed carbon
✅ The correct answer is option C.
Basic Chemical Engineering MCQs
Heat treatment of steel is done to mainly change its __________ properties.
A. Physical
B. Chemical
C. Mechanical
D. Surface
✅ The correct answer is option C.
The thermodynamic law, PVy = constant, is not followed by the
A. Free expansion of an ideal gas
B. Adiabatic expansion of steam in turbine
C. Adiabatic compression of air
D. Ideal compression of air
✅ The correct answer is option A.
Minimum thermal efficiency of a steam boiler may be around __________ percent
A. 25
B. 45
C. 65
D. 20
✅ The correct answer is option D.
Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
A. Conduction
B. Convection
C. Both A & B
D. Radiation
✅ The correct answer is option D.
Which of the following metals is not subjected to electrolytic refinning/purification?
A. Copper
B. Zinc
C. Tin
D. Aluminium
✅ The correct answer is option C.
Malleabilisation heat treatment is performed on
A. Cast steel
B. Grey cast iron
C. White cast iron
D. Spheroidal graphite cast iron
✅ The correct answer is option C.
A machine having assumed life of 20 years is purchased for Rs 32000/-. Its scrap value at the end of its life is Rs 8000/-. If the depreciation is calculated by diminishing balance method, then percentage reduction in its value at the end of first year is __________ percent.
A. 6.7
B. 7.6
C. 10.3
D. 15.2
✅ The correct answer is option A.
Hooke’s law
A. Applies to elastic deformation
B. Applies beyond limit of proportionality in stress-strain curve
C. States that stress is inversely proportional to strain upto elastic limit
D. Noneofthese
✅ The correct answer is option A.
Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?
A. Aluminium
B. Copper
C. Titanium
D. Stainless steel
✅ The correct answer is option C.