Chemical Engineering - Fluid Mechanics

46. 

Remote control valve is a __________ valve.

A. gate
B. butterfly
C. needle
D. globe

Answer: Option B

Explanation:

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47. 

Which of the following quantities are computed by using the hydraulic radius for non-circular ducts ?

A. Velocity and relative roughness.
B. Head loss and velocity.
C. Reynold number, relative roughness and head loss.
D. Reynolds number and friction factor.

Answer: Option C

Explanation:

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48. 

Centre of pressure in an immersed body is __________ the centre of gravity.

A. above
B. below
C. at
D. either above or below; depends on the liquid density

Answer: Option B

Explanation:

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49. 

The centre of pressure is

A. always below the centroid of the area.
B. always above the centroid of the area.
C. a point on the line of action of the resultant force.
D. at the centroid of the submerged area.

Answer: Option C

Explanation:

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50. 

The uniformity of a gas fluidised bed depends upon the __________ of the solid particles.

A. size
B. surface properties
C. both (a) and (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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