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ED & PD > S7 > Flashcards

S7 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.

A

none of these.

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3
Q

Pick out the wrong statement.

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 √ 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

In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by

A

4(0.86P^2 - πd^2/4) / πd

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13
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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14
Q

Pick out the wrong statement.

A

A 90° welded elbow is diagrammatically represented by

FIGURE

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15
Q

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

A

none of these.

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16
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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17
Q

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

A

6.5 mm

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18
Q

Pick out the correct statement

A

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

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19
Q

Safety valves are provided in chemical equipments to guard against excessive

A

pressure/pressure fluctuation

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20
Q

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

A

not related with

21
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

22
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.

23
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.

24
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

25
Q

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

A

d

26
Q

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

A

0.1-0.12

27
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

28
Q

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

A

Cross-partition rings.

29
Q

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

A

High specific heat

30
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

31
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.

32
Q

Lug support is meant for supporting __________ vessels.

A

small

33
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

34
Q

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

A

Triangular pitch.

35
Q

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

A

decreases

36
Q

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

A

saddle

37
Q

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

A

0.07 - 0.12

38
Q

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

A

0.85

39
Q

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

A

twice

40
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

41
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

42
Q

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

A

modulus of elasticity

43
Q

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

A

Ellipsoidal

44
Q

Bubble cap plate column is

A

a finite stage contactor.

45
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

46
Q

Pick out the wrong statement.

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’.

47
Q

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

A

all (a), (b) & (c).

48
Q

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

A

100

ED & PD (8 decks)

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