A. Aluminium
B. Stainless steel
C. Copper
D. Carbon steel
Process Equipment and Plant Design
Process Equipment and Plant Design
A. Ratio of true temperature difference to the LMTD
B. Ratio of LMTD to the true temperature difference
C. Differenced of true temperature difference and the LMTD
D. Geometric mean of the true temperature difference and the LMTD
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
A. 1.2
B. 0.5
C. 3.8
D. 6.8
A. Clearance between shell & baffles and between tube & baffles should be minimum to avoid
by-passing of the fluid, but it should be enough to permit the removal of tube bundle
B. Baffles are supported independently of the tubes by tie rods and positioned by spacers
C. Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum
number of tie rods is 4 with at least 10 mm diameter
D. Bracket supports are used for horizontal shell, while saddle support is used for vertical shell
A. Liquid gradient on the tray
B. Lower skirt clearance
C. Lower static submergence
D. Small downcomer liquid seal
A. Equal to the impeller diameter
B. Twice the impeller diameter
C. Twice the tank diameter
D. 3/4 of the tank height
A. If sufficient residence time (around 8 seconds) is not provided to the downcoming liquid in
the downcomer, it may entrain some vapour
B. The liquid head in the downcomer should not be greater than one half the plate spacing to
avoid flooding
C. The discharge end of the downcomer must project far enough into the tray liquid so that no
gas bubbles can enter the open end and by pass the bubble caps
D. None of these
A. Decreases upwards
B. Increases upwards
C. Remains same throughout
D. May decrease or increase upwards depending upon whether vacuum or positive pressure
would be maintained inside the shell
A. Sieve plate
B. Packed
C. Bubble cap plate
D. None of these
