Q.1
In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.
Q.2
Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency
Q.3
Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about __________ mm.
Q.4
Accidents in chemical plants are mostly due to
Q.5
Commercial packed scrubbers are normally designed for a pressure drop range of __________ mm water coloumn per metre of packed height.
Q.6
The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is
Q.7
Thin spherical shells subjected to internal pressure, develop __________ stresses.
Q.8
In chemical process equipments, the conical bottom heads used, usually has an apex angle of
Q.9
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always
Q.10
Overall tray efficiency of a distillation column is the ratio of the number of
Q.11
Wind load consideration in the design of a support can be neglected, when the vessel is
Q.12
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when
Q.13
In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to
Q.14
The retention time of material in a rotary dryer depends upon its
Q.15
In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about __________ cms.
Q.16
An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by
Q.17
Welded joint efficiency in the design of chemical process equipment is taken as
Q.18
Value of Peclet number = ∞, is the representative of
Q.19
For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.
Q.20
A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of
Q.21
Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.
Q.22
In a distillation column, bubble caps are located on trays with a pitch of __________ times the outside diameter of the caps.
Q.23
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)
Q.24
Apex angle of conical heads used in the bottom heads of chemical process equipments is usually
Q.25
The normal range of velocity of steam in pipes is __________ m/sec.
Q.26
For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft³/sec.ρ = fluid density, lb/ft³ μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)
Q.27
Shortest distance between two tubes is
Q.28
Le/D for a Tee (used as elbow, entering run) would be around
Q.29
A rivetted joint does not fail by __________ of rivets.
Q.30
A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design
Q.31
__________ heat exchanger is also known as 'hair pin type' exchanger,
Q.32
__________ head is the most economical for cylindrical vessels designed for operating at high pressure (> 15 atm.).
Q.33
Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about __________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate.
Q.34
for couplings and unions would be
Q.35
Longitundinal stress induced in a thin walled cylindrical storage vessel is
Q.36
Rate of filtrate delivery is inversely proportional to the
Q.37
Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.
Q.38
__________ dished head is the strongest of all.
Q.39
Hazards associated with the relief valve leakage for extremely hazardous material storage can be taken care of by providing
Q.40
In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is
Q.41
The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the __________ stress.
Q.42
In case of a 'thin' pressure vessel, the ratio of its diameter to wall thickness is
Q.43
A pressure vessel is said to be made of 'thick' shell, if the ratio of its diameter to wall thickness is
Q.44
With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will
Q.45
Width and depth of grooves in the tube sheet holes normally are __________ inch respectively.
Q.46
The thickness of heat transfer plates used in the plate type heat exchanger ranges from __________ mm, pressed in a single piece provided with grooves & corrugations.
Q.47
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.
Q.48
A pipe is generally made of circular cross-section, because a circular cross-section has the
Q.49
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell
Q.50
Thickness of the frame of a plate and frame filter as compared to that of plates is
0 h : 0 m : 1 s