A. 50
B. 250
C. 450
D. 850
✅ The correct answer is option C.
Basic Chemical Engineering MCQs
Electrochemical corrosion occurs
A. Where the liquid electrolytes containing free ions are present
B. Only in alloys
C. Only in pure metals
D. Due to direct chemical action of metal with oxygen
✅ The correct answer is option A.
The ratio of coil diameter to wire diameter of a spring is called the spring
A. Index
B. Deflection
C. Form co-efficient
D. None of these
✅ The correct answer is option A.
Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is
A. Very low which prevents their ignition by compression
B. Very high which prevents their ignition by compression
C. Zero
D. None of these
✅ The correct answer is option A.
Oxyacetylene reducing flame is used while carrying out welding on
A. Alloy steel
B. Grey cast iron
C. Mild steel
D. High carbon steel
✅ The correct answer is option C.
Two solutions A₁ & A₂ have pH value of 2 & 6 respectively. It implies that the solution
A. A₁ is more alkaline than solution A₂
B. A₁ is highly acidic
C. A₂ is very slightly acidic
D. Both B & C
✅ The correct answer is option D.
Maximum permissible air velocity in pipelines is about __________ metre/second.
A. 5
B. 10
C. 20
D. 40
✅ The correct answer is option B.
Ultimate strength in tension as compared to that in shear for steel is
A. Half
B. One third
C. One and half times
D. One fourth
✅ The correct answer is option C.
Globular form of cementite is formed during the __________ process.
A. Spherodising
B. Hardening
C. Annealing
D. Normalising
✅ The correct answer is option B.
The most detrimental impurity in high pressure boiler feed water is
A. Suspended salt
B. Dissolved salt
C. Silica
D. Turbidity
✅ The correct answer is option C.