Engineering :: Hydraulics and Fluid Mechanics
281.
The velocity corresponding to Reynold number of 2000 is called
A. sub-sonic velocity
B. super-sonic velocity
C. lower critical velocity
D. higher critical velocity
Answer: C
Explanation:
282.
The velocity corresponding to Reynold number of 2800, is called
A. sub-sonic velocity
B. super-sonic velocity
C. lower critical velocity
D. higher critical velocity
Answer: D
Explanation:
283.
The loss of pressure head in case of laminar flow is proportional to
A. velocity
B. (velocity)2
C. (velocity)3
D. (velocity)4
Answer: A
Explanation:
284.
A moving fluid mass may be brought to a static equilibrium position, by aplying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called
A. Pascal's law
B. Archimede's principle
C. D-Alembert's principle
D. none of these
Answer: C
Explanation:
285.
The D-Alembert's principle is used for changing the dynamic equilibrium of a fluid mass, into a static equilibrium.
Answer: A
Explanation:
286.
When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid
A. remains horizontal
B. becomes curved
C. falls on the front end
D. falls on the back end
Answer: C
Explanation:
287.
An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be
A. equal to
B. directly proportional
C. inversely proportional
Answer: B
Explanation:
288.
A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.
Answer: A
Explanation:
289.
In a footstep bearing, if the speed of the shaft is doubled, then the torque required to over-come the viscous resistance will be
A. double
B. four times
C. eight times
D. sixteen times
Answer: A
Explanation:
290.
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be
A. double
B. four times
C. eight times
D. sixteen times
Answer: D
Explanation:
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