# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 4

11.

A flow whose streamline is represented by a curve, is called

 A. one-dimensional flow B. two-dimensional flow C. three-dimensional flow D. four-dimensional flow

Answer: Option B

Explanation:

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12.

When the Mach number is less than unity, the flow is called

 A. sub-sonic flow B. sonic flow C. super-sonic flow D. hyper-sonic flow

Answer: Option A

Explanation:

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13.

When the end contractions of the weir are suppressed, then number of end contractions (n) are taken as zero

 A. Agree B. Disagree

Answer: Option A

Explanation:

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14.

A flow is called hyper-sonic, if the Mach number is

 A. less than unity B. unity C. between 1 and 6 D. none of these

Answer: Option D

Explanation:

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15.

The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

 A. B. C. D. Answer: Option B

Explanation:

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