In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.
A. Equal to
B. one-fourth
C. one-third
D. one-half
Answer B
An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)
A. tan ? = a/g
B. tan ? = 2 a/g
C. tan ? = a/2g
tan ? = a²/2g
Answer A
A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is
A.
B.
C.
D
A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is
A.2.89 KN
B. 8.29KN
C. 9.28KN
D. 28.9KN
Explanation:
We know pressure exerted per unit length = ωH²/2. So, the pressure of water per metre length = (9. 81x103x1.32) /2. = 8.29 KN.
Reynold's number is the ratio of inertia force to
A. pressure force
B. Elastic force
C. Gravity force
D. Viscous force
Answer D
