Related Questions

A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.
A 45
B 60
C 80
D 95
In a distillation column, bubble caps are located on trays with a pitch of __________ times the outside diameter of the caps.
A 1.3 to 2
B 1.6 to 2
C 2.5
D 1.5 to 3
Diameter of the seive tray column is determined by the
A Lower limit of vapour velocity
B Upper limit of the vapour velocity
C Hole diameter of the seive tray
D Height of the plate spacing
Larger depth of liquid on the trays of a distillation column
A Leads to high tray efficiency
B Results in higher pressure drop per tray
C Both A & B
D Neither A nor B
The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter.
A 0.6-0.8 times
B Equal to
C Twice
D 2 ft irrespective of (for column > 3 ft diameter)
In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.
A 1.1 to 1.5
B 1.6 to 2
C 2.2 to 2.6
D 2.7 to 3
In distillation columns, bubble caps are held in place over trays by
A Rivets
B A hold down bar
C Bolts
D Both B and C
Regeneration of molecular seive requires it to be heated to a temperature of about __________ °C.
A 80-120
B 200-300
C 600-800
D 1000-1100
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where $$\sigma $$ = Stress for a plate with no hole i.e. nominal stress)
A $$\sigma \left( {1 + \frac{{\text{b}}}{{2{\text{a}}}}} \right)$$
B $$\sigma \left( {1 + \frac{{2{\text{a}}}}{{\text{b}}}} \right)$$
C $$\sigma \left( {1 + \frac{{\text{b}}}{{3{\text{a}}}}} \right)$$
D $$\sigma \left( {1 + \frac{{3{\text{a}}}}{{\text{b}}}} \right)$$
Packed column distillation is limited to the column __________ metres.
A [

A. Height

B. Diameter

B Both A & B
C Neither A nor B

Next steps