A. 87% cementite & 13% Fe
B. 87% ferrite & 13% cementite
C. 93.33% ferrite & 6.67% C
D. 87% ferrite & 13% C
✅ The correct answer is option B.
Chemical Engineering MCQs
The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.
A. Red
B. Extended
C. Super
D. Extreme
✅ The correct answer is option C.
Color of brass changes from yellow to __________ after its dezincification which exemplifies selective leaching.
A. Grey
B. Red
C. Orange
D. Violet
✅ The correct answer is option B.
Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal
A. Tensile strength
B. Compressive strength
C. Young’s modulus
D. Thermal co-efficient of expansion
✅ The correct answer is option D.
Identify the false statement
A. Martensitic steels are less susceptible to pitting corrosion than austenitic steels
B. Pitting corrosion is usually very localised
C. Hydrogen embrittlement is facilitated by tensile stress
D. Stress corrosion cracking is facilitated by tensile stress
✅ The correct answer is option A.
Which of the following is prone to cup and cone fracture?
A. Cast iron
B. Soft brass
C. Round specimen of ductile metal
D. Flat tensile specimen of ductile metal
✅ The correct answer is option C.
Machine tool bodies are usually made of
A. Cast iron
B. Mild steel
C. Wrought iron
D. Copper alloys
✅ The correct answer is option A.
The product (s) of roasting of a sulphide ore is (are)
A. Oxide only
B. Sulphate only
C. Oxide and sulphate
D. Dependent on temperature and partial pressure of oxygen & sulphur dioxide
✅ The correct answer is option A.
The substance used as a smoke screen in warfare is
A. C₂H₂
B. SiCl₄
C. P₂O₅
D. PCl5
✅ The correct answer is option B.
Auto collimator is used to check
A. Flatness
B. Angle
C. Rotor balancing
D. Roughness
✅ The correct answer is option B.