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Process Equipment and Plant Design

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

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

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Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

(1.2)3/5
(1.2)3/2
(1.2)2/3
(1.2)5/3

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Process Equipment and Plant Design
For turbine agitator, the impeller diameter is about

0.65 to 0.85 d
0.95 d
0.3 to 0.5 d
0.1 to 0.2 d

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

Higher
Unpredictable
Lower
Same

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Process Equipment and Plant Design
Optimum economic pipe diameter for fluid flow is determined by the

Viscosity of the fluid
None of these
Density of the fluid
Total cost considerations (pumping cost plus fixed cost of the pipe)

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Process Equipment and Plant Design
Nominal size of a pipe is an indication of its __________ diameter.

Outer
Approximate
None of these
Inner

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