Chemical Engineering Mcqs

In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (ζ) and thermal diffusivity (α). The units of these quantities are ?

(A) μ , α and θ all have units of m/s

(B) μ , α and θ all have units of m2/s

(C) α and θ have units of m2/s, while μ has unit of m/s

(D) α and θ have units of m/s, while μ has unit of m2/s

Submitted By: Ali Uppal


Fire in fuel gas pipelines is extinguished most effectively by _________________?

(A) Spraying water

(B) Blanketting the area with nitrogen atmosphere

(C) Fire fighting foam

(D) None of these

Submitted By: Ali Uppal


Pick out the wrong statement ?

(A) A soft magnetic material should have high permeability and small area of hysteresis loop

(B) Poisson’s ratio of high melting point metals is more than unity

(C) Solders generally melt at less than 185°C

(D) Steel produced by

Submitted By: Ali Uppal


Submitted By: Ali Uppal


Submitted By: Ali Uppal


Submitted By: Ali Uppal


Submitted By: Ali Uppal


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 ‘A’, ‘B’ & ‘C’

Submitted By: Ali Uppal


Addition of silicon to cast iron ___________________?

(A) Promotes graphite module formation

(B) Improves its ductility

(C) Does not promote graphite flakes formation

(D) Increases the fluidity of molten metal

Submitted By: Ali Uppal


______________________ is used as a material of construction for the blade of power saw ?

(A) Wrought iron

(B) Stainless steel

(C) Mild steel

(D) High speed steel

Submitted By: Ali Uppal