Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the_____________________?

A. Sensible heat differences are small, because the temperature changes from tray to tray is small
B. Trouton’s rule is applicable
C. Liquid/vapor loading across the column remains constant
D. All A., B. and C.

Column support for the roof of cylindrical storage tank must be provided for___________________?

A. Small diameter tanks
B. Large diameter tanks
C. Small diameter tall tanks
D. All tanks irrespective of their heights and diameters

The dust collection efficiency of electrostatic precipitator increases with increase in the_________________?

A. Gas flow rate
B. Electrode area
C. Both A. & B.
D. Neither A. nor B.

Optimum economic pipe diameter for fluid flow is determined by the____________________?

A. Viscosity of the fluid
B. Density of the fluid
C. Total cost considerations (pumping cost plus fixed cost of the pipe)
D. None of these

Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than ______________ of the head?

A. 6% of I.D.
B. 3 times the thickness
C. Either A. or B., whichever is larger
D. Either A. or B., whichever is smaller

In a heat exchanger, shell side fluid velocity can be changed by changing the tube _______________________?

A. Layout
B. Pitch
C. Both A. & B.
D. Neither A. nor B.

Rotary driers are most economically designed for the number of heat transfer units (HTU) from _________________?

A. 0.01 to 1
B. 1.5 to 2.5
C. 5 to 10
D. 10 to 20

For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell_________________?

A. Decreases upwards
B. Increases upwards
C. Remains same throughout
D. May decrease or increase upwards depending upon whether vacuum or positive pressure

Liquid gradient over a tray can be minimised by________________?

A. Providing a higher skirt clearance or a higher weir
B. Decreasing the number of rows of caps through which the liquid flows or by decreasing the
velocity of liquid flow past the caps or by reducing the distance along the tray through which
the liquid must flow

If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will _____________ times?

A. Increase by 1.8
B. Decrease by 22
C. Increase by 21.6
D. None of these