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Hydraulic and Fluid Machines - Interview Questions and Answers

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56. Mach number is significant in
A. supersonics, as with projectiles and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship's hulls
D. all of fhe above
E. none of the above.
Explanation:
57. Mercury does not wet glass. This is due to property of liquid known as
A. adhesion
B. cohesion
C. surface tension
D. viscosity
E. compressibility.
Explanation:
58. The fluid forces considered in the Navier Stokes equation are
A. gravity, pressure and viscous
B. gravity, pressure and turbulent
C. pressure, viscous and turbulent
D. gravity, viscous and turbulent
E. none of the above.
Explanation:
59. For hypersonic flow, the Mach number is
A. unity
B. greater than unity
C. greater than 2
D. greater than 4
E. greater than 10.
Explanation:
60. A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is
A. 0.
B. 0.6
C. 0.4
D. 0.3
E. none of the above.
Explanation:
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