Mechanical Engineering - Hydraulics and Fluid Mechanics

46. 

A notch is used to measure __________ of liquids.

A. pressure
B. discharge
C. velocity
D. volume

Answer: Option B

Explanation:

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47. 

A flow is called sonic, if the Mach number is unity.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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48. 

An error of 1% in measuring head over the crest of the notch (H) will produce an error of __________ in discharge over a triangular notch,

A. 1%
B. 1.5%
C. 2%
D. 2.5%

Answer: Option D

Explanation:

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49. 

A flow through a long pipe at decreasing rate is called __________ uniform flow.

A. steady
B. unsteady

Answer: Option B

Explanation:

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50. 

The surface tension of mercury at normal temperature is __________ that of water.

A. same as
B. lower than
C. higher than

Answer: Option C

Explanation:

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