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ed & pd > S5 > Flashcards

S5 Flashcards

1
Q

________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids.

A

Packed

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2
Q

At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.

A

lower

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3
Q

The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the ____________ stress.

A

ultimate

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4
Q

The wall thickness of thin cylindrical shell with hemispherical ends is ________ that of the spherical ends.

A

more than

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5
Q

A ‘rupture disc’ is provided in chemical equipments as an accessory meant for

A

relieving excess pressure.

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6
Q

In a vertical short tube evaporator (Calendria type), the

A

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

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7
Q

In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is

A

called tube pitch.

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8
Q

Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of

A

preventing the local overstressing of the shell around the opening.

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9
Q

Minimum tube pitch recommended for shell and tube heat exchangers is about ________ times the outside diameter of the tube.

A

1.25

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10
Q

Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or __________ times the column diameter, whichever is lower.

A

2.5-3.0

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11
Q

Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.

A

0 to 0.08

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12
Q

In case of saddle packing (e.g., berl and intralox saddles), the maximum size of the packing should not exceed __________ of the column diameter.

A

l/15th

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13
Q

The thermal stress in a metallic bar does not depend upon the

A

cross-sectional area.

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14
Q

The minimum baffle height should be

A

twice the impeller diameter.

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15
Q

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)

A

Di,Opt = 3.9 Q^0.45 ρ^0.13

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16
Q

To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to

A

1.5 d

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17
Q

The normal range of velocity of water in pipes is __________ m/sec.

A

1-2

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18
Q

Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle?

A

Flat plate extending across the wall

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19
Q

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

A

irrespective of the shape of the vessel.

20
Q

In a __________ rivetted joint, the number of rivets decreases from the innermost row to the outermost row.

A

diamond

21
Q

Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about __________ percent of the total thickness.

A

10 to 20

22
Q

Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is

A

about 3 times

23
Q

Pick out the wrong statement pertaining to the design of the distillation column.

A

none of these.

24
Q

The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is

A

pd/4t

25
Q

The buckling tendency of compression members is always in the direction of the

A

least radius of gyration.

26
Q

In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ __________ cms.

A

3.8

27
Q

The average velocity in the tubes of a 1-4 heat exchanger is __________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate.

A

4

28
Q

Hoop (circumferential) stress induced in a thin walled ‘Horton Sphere’ used for the storage of liquid ammonia under pressure is

A

pD/2t

29
Q

When one of the fluids is highly corrosive and has fouling tendency, it should

A

preferably flow inside the tube for its easier internal cleaning.

30
Q

The raio, propeller agitator dia / tank dia is normally taken as

A

0.15-030

31
Q

A/an __________ is used for changing the direction of a pipeline.

A

elbow

32
Q

Maximum plate efficiency is achieved in case of __________ flow.

A

cross

33
Q

The LMTD correction factor (FT) is defined as the

A

ratio of true temperature difference to the LMTD.

34
Q

The clearance between two tubes in a shell and tube heat exchanger is known as ‘ligament’, whose minimum value is __________ the outside diameter of the tube, but in no case it should be less than 4.5 mm.

A

one fourth

35
Q

The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is

A

0.25

36
Q

Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from

A

1.5-2.5

37
Q

Value of Peclet number = 0, is the representative of

A

complete back mixing.

38
Q

Poisson’s ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson’s ratio for structural and pressure vessel steel may be taken as

A

0.3

39
Q

Removable connection of tubes to tube sheet is called

A

ferrule

40
Q

Stress-strain diagram for low carbon steel/mild steel is shown below in the Fig.

The point ‘A’ on the Fig. represents the

A

elastic limit

41
Q

Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around

A

0.5”

42
Q

The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter.

A

0.6-0.8 times

43
Q

Le/D for couplings and unions would be

A

negligible

44
Q

What is the slope of the operating line in the rectifying section of a distillation coloumn?

A

<1

45
Q

Stage efficiency for packed tower varies with the

A

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

ed & pd (8 decks)

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