S7 Flashcards
(48 cards)
Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have ________ roofs.
floating
Pick out the wrong statement.
none of these.
Pick out the wrong statement.
In a stainless steel seive tray, the minimum hole diameter is equal to 10 times the plate thickness.
In the downcomer of a distillation column, the minimum recommended residence time is about ________ seconds.
5
For identical situation, condensing film coefficient in case of a horizontal condenser is almost ________ the value expected in case of vertical condenser.
thrice
Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as
d = 1.6 √ t
A binary liquid azeotropic mixture has boiling point lower than either of the components, when it shows ________ deviation from Raoult’s Law.
positive
In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube?
Horizontal tube evaporator
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
2^0.8
In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for
creating turbulence.
For turbine agitator, the impeller diameter is about
0.3 to 0.5 d
In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by
4(0.86P^2 - πd^2/4) / πd
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.
increase by 2^1.6
Pick out the wrong statement.
A 90° welded elbow is diagrammatically represented by
FIGURE
Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.
none of these.
Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger?
25% cut segmental baffle.
What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers?
6.5 mm
Pick out the correct statement
Centre to centre distance between two consecutives rivets in a row is called the pitch.
Safety valves are provided in chemical equipments to guard against excessive
pressure/pressure fluctuation
The equivalent diameter for pressure drop is ________ that for heat transfer.
not related with
The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called
static submergence
Liquid gradient over the tray results due to the
resistance offered to flow of liquids by caps & risers and the flow of gas.
The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles?
To increase the tube side heat transfer co-efficient by inducing turbulence.
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.
80
