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(IB) Process Equipment & Plant Design > Section 7 > Flashcards

Section 7 Flashcards

1
Q

Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have __________ roofs.

A

floating

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2
Q

Pick out the wrong statement.

Plate efficiency increases with increase in superficial vapour velocity till entrainment limit.

Increase in depth of the liquid about the slots increases the plate efficiency, particularly if the liquid depth is < 1”.

Too small a plate spacing can cause a low efficiency, if the vapour velocity is greater than the allowable value.

none of these.

A

none of these

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3
Q

Pick out the wrong statement.

In practical operation, distillation towers having diameter 3-6 metres equipped with bubble cap (round) size of 15 cms are used.

Height of packing in a packed tower is about 3 times the column diameter for raschig rings and about 5 to 10 times the column diameter for saddle packing.

In a seive tray, the minimum hole diameter is equal to the tray thickness.

In a stainless steel seive tray, the minimum hole diameter is equal to 10 times the plate thickness.

A

In a stainless steel seive tray, the minimum hole diameter is equal to 10 times the plate thickness.

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4
Q

In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.

A

5

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5
Q

For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.

A

thrice

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6
Q

Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as

A

d = 1.6 sqrt(t)

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7
Q

A binary liquid azeotropic mixture has boiling point lower than either of the components, when it shows __________ deviation from Raoult’s Law.

A

positive

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8
Q

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

A

Horizontal tube evaporator

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9
Q

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

A

2^0.8

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10
Q

In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for

A

creating turbulence.

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11
Q

For turbine agitator, the impeller diameter is about

A

0.3 to 0.5 d

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12
Q

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.

A

increase by 2^1.6

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13
Q

Pick out the wrong statement. (may pic pero in case lang)

An air cooled finned pipe is diagram-matically represented by

A heat exchanger is diagrammatically represented by

A 90° welded elbow is diagrammatically represented by

A pipe still heater is diagrammatically represented by

A

A 90° welded elbow is diagrammatically represented by

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14
Q

Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.

Tube dia is 3-6 cms, while tube length in 3-6 metres.

Steam is fed to the shell, whereas the liquor is filled inside the tube.

Liquor level is maintained at l/3rd to 1/2 of the height of the tube.

none of these.

A

none of these

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15
Q

Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger ?

A

25% cut segmental baffle.

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16
Q

What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers ?

A

6.5 mm

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17
Q

Pick out the correct statement

Centre to centre distance between two consecutives rivets in a row is called the pitch.

A rivetted joint made in overlapping plates is called butt joint.

Hole size drilled in rivetted plates is less than the actual size of the rivet.

none of these.

A

Centre to centre distance between two consecutives rivets in a row is called the pitch.

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18
Q

Safety valves are provided in chemical equipments to guard against excessive

A

pressure/pressure fluctuation

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19
Q

The equivalent diameter for pressure drop is __________ that for heat transfer.

A

smaller than

20
Q

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

A

static submergence

21
Q

Liquid gradient over the tray results due to the

A

resistance offered to flow of liquids by caps & risers and the flow of gas.

22
Q

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 ?

A

To increase the tube side heat transfer co-efficient by inducing turbulence.

23
Q

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

80

24
Q

The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)

A

d

25
Q

Baffle width is normally taken as __________ times the tank diameter.

A

0.1-0.12

26
Q

A cylinderical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to

A

10 mm

27
Q

Which of the following packing materials provides for maximum mass transfer ?

A

Cross-partition rings.

28
Q

__________ of water makes it a widely used coolant in heat exchangers.

A

High specific heat

29
Q

The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area ‘A’ is given by (where, P = perimeter of the channel in contact with the fluid)

A

4 A/P

30
Q

Fouling factor must be included in the calculation of over all design heat transfer coefficient, when the liquid

A

containing suspended solids flows at low velocity.

31
Q

Lug support is meant for supporting __________ vessels.

A

small

32
Q

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.

A

NH3

33
Q

Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate ?

A

Triangular pitch.

34
Q

In case of 1.5” heat exchanger tubes, the inside flow area __________ with decrease in BWG.

A

decreases

35
Q

Cylindrical pressure vessels in horizontal condition is generally supported on a __________ support.

A

saddle

36
Q

Pressure drop per tray in the atmospheric distillation column is about __________ psi.

A

0.07 - 0.12

37
Q

Welded joint efficiency in the design of chemical process equipment is taken as

A

0.85

38
Q

The thickness of segmental baffles (25 -35% cut truncated plates usually) is generally __________ the tube wall thickness.

A

twice

39
Q

The safe height (h) to diameter (d) ratio (i.e., h/d) for liquid/petro fuel storage tank of capacity more than 45 kilolitres is less than

A

1

40
Q

For given number of passes, pitch & tube diameter, the maximum number of tubes that can be accommodated in a shell of tripled inside diameter will be __________ times.

A

considerably more than 9

41
Q

The ratio of linear stress to linear strain is termed as the

A

modulus of elasticity

42
Q

__________ head is the most economical for cylindrical vessels designed for operating at high pressure (> 15 atm.).

A

Ellipsoidal

43
Q

Bubble cap plate column is

A

a finite stage contactor.

44
Q

In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.

A

2.5 to 4.0

45
Q

Pick out the wrong statement.

Rivetting provides a permanent fastening method.

The joint made by overlapping of one plate over the other, and then rivetting the two plates together with two rows of rivets is called ‘double rivetted butt joint’.

Shank diameter of the rivets should be less than the size of the hole drilled in the plate for rivetting.

The efficiency of a rivetted joint is the ratio of the strength of the rivetted joint to the strength of the solid plate.

A

The joint made by overlapping of one plate over the other, and then rivetting the two plates together with two rows of rivets is called ‘double rivetted butt joint’.

46
Q

The force due to wind load acting on a tall vessel depends upon its

A

all

47
Q

Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about __________ mm.

A

100

(IB) Process Equipment & Plant Design (8 decks)

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