A. Decreases
B. Increases
C. Remains constant
D. Shows no systematic variation
✅ The correct answer is option A.
Basic Chemical Engineering MCQs
Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as
A. Re0.5, Re0.8
B. Re0.8, Re-0.5
C. Re0.8, Re0.5
D. Re-0.8, Re0.5
✅ The correct answer is option C.
With increase in temperature, the surface tension of water
A. Increases
B. Decreases
C. Remains constant
D. Increases linearly
✅ The correct answer is option B.
Lead is poured into the joints between two __________ pipes.
A. Cast iron
B. Steel
C. Concrete
D. Plastic
✅ The correct answer is option A.
Desalination of water
A. Makes it potable
B. Makes it non-potable
C. Means distillation of water
D. None of these
✅ The correct answer is option A.
Shaft/rotor speed is most accurately measured by a
A. Frequency counter
B. Tachometer
C. Strobometer
D. Speedometer
✅ The correct answer is option C.
Knocking tendency in a petrol engine decreases with increasing
A. Supercharging
B. Compression ratio
C. Wall temperature
D. Engine speed
✅ The correct answer is option D.
Function of gear box is to
A. Reduce the speed
B. Obtain variable speed
C. Increase the speed
D. Produce high torque
✅ The correct answer is option B.
__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
A. Beryllia
B. Zirconia
C. Alumina
D. Magnesia
✅ The correct answer is option C.
__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.
A. Lancing
B. Shot peening
C. Slugging
D. Spinning
✅ The correct answer is option B.