A. Corrosion in organic liquids
B. Atmospheric corrosion in moist gas or air
C. Soil corrosion as in the case of underground pipes
D. Corrosion in sea water and molten metals
✅ The correct answer is option A.
Basic Chemical Engineering MCQs
When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the
A. Partial pressure of water vapour is less than the total pressure
B. Humidity is < 100% & dew point temperature of air has not reached
C. Dew point temperature of air has not reached & air is not saturated fully
D. Air is fully saturated
✅ The correct answer is option D.
Air-petrol ratio in an automotive petrol engine is around
A. 14 : 1
B. 22 : 1
C. 25 : 1
D. 4 : 1
✅ The correct answer is option A.
Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m² of steel strip.
A. 5-10
B. 1000-1500
C. 120-500
D. 1500-3000
✅ The correct answer is option C.
Heat treatment of steel is done mainly to change its
A. Mechanical properties
B. Physical properties
C. Chemical composition
D. All of the above
✅ The correct answer is option A.
__________ strain gauge is the most sensitive sensing element for strain measurement.
A. Photoelastic
B. Semiconductor
C. Wire resistance
D. None of these
✅ The correct answer is option B.
Which is the only metal that exists in liquid state at room temperature?
A. Sodium
B. Mercury
C. Lithium
D. Strontium
✅ The correct answer is option B.
In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.
A. 0.5
B. 1
C. 5
D. 20
✅ The correct answer is option C.
Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?
A. Output & fineness
B. Velocity
C. Both A & B
D. None of these
✅ The correct answer is option C.
Colour comparator is used to measure the
A. PH value
B. Electrode potential
C. Colour intensity
D. None of these
✅ The correct answer is option A.