Chemical Engineering - Fluid Mechanics

6. 

The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.

A. inlet tip of a blade curves in a direction opposite to that
B. outlet tip of a blade curves in a direction opposite to that
C. inlet tip of a blade is towards the direction
D. outlet tip of a blade is towards the direction

Answer: Option D

Explanation:

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7. 

For the same terminal conditions and fitting size, the least friction loss is incurred in a/an

A. T-joint
B. union
C. 45° elbow
D. 90°bend

Answer: Option B

Explanation:

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8. 

A floating/submerged body is always stable, if its centre of gravity

A. lies above its centre of buoyancy.
B. and centre of buoyancy coincide.
C. lies below its centre of buoyancy.
D. lies above its meta centre.

Answer: Option C

Explanation:

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9. 

The co-efficient of discharge of an orificemeter is a function of

A. Reynolds number at the orifice.
B. ratio of orifice dia to pipe dia.
C. both (a) and (b).
D. none of the above parameters, and has a constant value of 0.61.

Answer: Option C

Explanation:

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10. 

Critical velocity in a pipe flow

A. increases as fluid viscosity increases.
B. increases as pipe diameter increases.
C. independent of fluid density.
D. none of these.

Answer: Option B

Explanation:

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