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Process Equipment and Plant Design

Process Equipment and Plant Design
Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.

5 to 10
10 to 15
1.5 to 2
2.5 to 5

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Process Equipment and Plant Design
Rivets are generally specified by the

None of these
Overall length
Shank diameter
Head diameter

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Process Equipment and Plant Design
In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)

(D₂² - D₁²)/D₂²
None of these
(D₂² - D₁²)/D₁²
D₂ - D₁

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Process Equipment and Plant Design
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

7.5-10.0
3.5-5.5
1.5-2.5
44119

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Process Equipment and Plant Design
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

1.5 d
D
0.5 d
2.5 d

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Process Equipment and Plant Design
The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is

pd/3t
pd/4t
pd/2t
pd/t

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