Mechanical Engineering - Hydraulics and Fluid Mechanics

16. 

The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is

A. 200 kg/m3
B. 400 kg/m3
C. 600 kg/m3
D. 800 kg/m3

Answer: Option D

Explanation:

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17. 

The dynamic viscosity of the liquid __________ with rise in temperature.

A. remain unaffected
B. increases
C. decreases

Answer: Option C

Explanation:

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18. 

When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.

A. sum
B. difference
C. arithmatic mean
D. geometric mean

Answer: Option B

Explanation:

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19. 

The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is

A. ρ ω2 r2
B. 2ρ ω2 r2
C.
D.

Answer: Option C

Explanation:

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20. 

When the Mach number is between __________ the flow is called super-sonic flow.

A. 1 and 2.5
B. 2.5 and 4
C. 4 and 6
D. 1 and 6

Answer: Option D

Explanation:

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