A. Combustion with air
B. Gravitational pull by earth
C. Friction with earth’s atmosphere
D. Loss in weight of the satellite
✅ The correct answer is option C.
Chemical Engineering MCQs
A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.
A. 0.01
B. 0.1
C. 0.25
D. 0.5
✅ The correct answer is option B.
The yield point in fatigue loading compared to that in static loading is less. The ratio of ultimate tensile strength to endurance limit of a material subjected to fatigue loading is
A. 0.5
B. 1
C. 1.5
D. 2
✅ The correct answer is option D.
Heat dissipation in cooling towers is mainly by
A. Conduction
B. Convection
C. Evaporation
D. Radiation
✅ The correct answer is option C.
The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then
A. Wet bulb temperature=dry bulb temperature
B. Wet bulb temperature=dew point temperature
C. Saturation temperature=dew point temperature
D. All of the above
✅ The correct answer is option D.
An abrupt and sudden fall in the readinp of barometer is an indication of the
A. Storm
B. Rain
C. Clear weather
D. Cold wave
✅ The correct answer is option A.
__________ rubber is generally used for making ‘O’ rings used for vacuum sealings.
A. Natural
B. Neoprene
C. Butadiene
D. Nitrile
✅ The correct answer is option B.
Hardening of steel is not possible, unless it is heated __________ critical point.
A. Above the highest
B. Above the lowest
C. Between the first & second
D. Between the second & third
✅ The correct answer is option B.
What is the pH of distilled water?
A. 0
B. 1
C. 7
D. 14
✅ The correct answer is option C.
The refractory lining of the bottom in a basic electric arc furnace is made of
A. Silica
B. Alumina
C. Magnesia
D. Fireclay
✅ The correct answer is option C.