A. SiO₂
B. Al2O₃
C. MnO₂
D. P
✅ The correct answer is option A.
Basic Chemical Engineering MCQs
Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore?
A. High fusibility & fluidity
B. High thermal conductivity
C. Low density
D. High chemical activity
✅ The correct answer is option B.
The maximum percentage of chromium that can be added to steel is about
A. 12
B. 18
C. 24
D. 30
✅ The correct answer is option B.
The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is
A. Magnesite
B. Chrome
C. Silica
D. Fireclay
✅ The correct answer is option C.
Compressed dry air is used as the cutting fluid, while machining
A. Steel
B. Cast iron
C. Aluminium
D. None of these
✅ The correct answer is option B.
Fatigue resistance of a material is measured by the
A. Elastic limit
B. Ultimate tensile strength
C. Young’s modulus
D. Endurance limit
✅ The correct answer is option D.
The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it, is defined as the
A. Minimum fluidisation velocity
B. Terminal velocity
C. Elutriation velocity
D. Superficial velocity
✅ The correct answer is option C.
Styrofoam is the commercial name of
A. Polyurathene
B. Polystyrene
C. Polyacrylonitrile
D. Polybutadiene
✅ The correct answer is option B.
Castability of aluminium is increased by the addition of __________ in it.
A. Silicon
B. Manganese
C. Bismuth
D. Lead
✅ The correct answer is option A.
Dezincification is a form of corrosion, which specifically applies to
A. Steel
B. Brass
C. Stainless steel
D. Babbit metal
✅ The correct answer is option B.