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49.

Coefficient of contraction for an external cylindrical mouthpiece is                        
A. 1 B. 0.855
C. 0.7H D. 0.611



50.

Which of the following has highest coefficient of discharge ?                        
A. sharp edged orifice B. venturimeter
C. Borda's mouthpiece running full D. CipoUetti weir



51.

In a Sutro weir, the discharge is proportional to
where H is head.                        
A. H1/2 B. H3/2
C. H5/2 D. H




52.

The discharge over a broad crested weir is maximum when the depth of flow is
where H is the available head.                        
A. H/3 B. H/2
C. 2 H/5 D. 2 H/3



53.

Which of the following statements is correct?                        
A. Lower critical Reynolds number is of no practical significance in pipe flow problems. B. Upper critical Reynolds number is significant in pipe flow problems.
C. Lower critical Reynolds number has the value 2000 in pipe flow D. Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.



54.

For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be                        
A. 300 B. 337.5
C. 600 D. 675



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