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Process Equipment and Plant Design

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

3.5-5.5
7.5-10.0
44119
1.5-2.5

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Process Equipment and Plant Design
The diameter of a propeller agitator used in agitation tank ranges from __________ percent of the tank diameter and its peripherial speed is normally 300 to 500 metres/minute.

5 to 10
55 to 75
15 to 30
40 to 50

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Process Equipment and Plant Design
The dust collection efficiency of electrostatic precipitator increases with increase in the

Gas flow rate
Both A & B
Neither A nor B
Electrode area

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Process Equipment and Plant Design
The normal range of velocity of steam in pipes is __________ m/sec.

0.1-0.5
80-100
1-5
10-20

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Process Equipment and Plant Design
In a cylinderical vessel subjected to internal pressure, the longitudinal stress σL and the circumferential stress, σh are related by

σh = σL/2
No relation exists
σh = σL
σh = 2 σL

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

Five times
Twice
Thrice
Half

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