Process Equipment And Plant Design | Test For NTS PPSC FPSC, TEST

Pick out the wrong statement about the design of a sieve plate column ?

A. An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns
B. For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design
C. Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns
D. Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds

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Category: Process Equipment and Plant Design

In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube ?

In a shell and tube heat exchanger, the ‘tube pitch’ is defined as the _____________________?

Pick out the wrong statement about the design of a sieve plate column ?

The normal range of velocity of water in pipes is _______________ m/sec?

An adequate clearance between the tray and the shell wall of a distillation column is provided to_____________________?

For identical operating conditions, the pressure drop over _______________ tray is the highest out of the following?

Excessive liquid gradient on a tray may result in the______________________?

In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as___________________?

In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube) ?

Stage efficiency for packed tower varies with the____________________?