386.  Pick up the correct statement from the following :
A. In incompressible flow the density of a fluid remains constant
B. In compressible flow, the density of a fluid changes from point to point
C. In uniform flow, the velocity of a fluid does not change with respect to length of flow direction
D. All the above.

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387.  The discharge through a 100 mm diameter external mouth piece fitted to the side of a large vessel is 0.05948 m3/s. The head over the mouth piece is
A. 2 m
B. 2.5 m
C. 3.0 m
D. 4.0 m.

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388. Pick up the correct statement regarding convergent divergent mouth piece from the following :
A. It converges upto Venacontracta and then diverges
B. In this mouth piece there is no loss of energy due to sudden enlargement
C. The coefficient of discharge is unity
D. All the above.

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389. The mouth piece shown in Fig. 7.3 is generally known as
A. Internal mouth piece
B. Re-entrant mouth piece
C. Borda's mouth piece
D. All the above.

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390. Pick up the correct statement from the following :
A. When the length of the tube is equal to diameter of the internal mouth piece, the jet of liquid comes out without touching the sides of the tube
B. When the length of the tube is three times the diameter
C.
D.

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391. Pick up the correct statement regarding Borda's mouth piece running full from the following :
A. Actual velocity at the out let is -^1g-H
B. Theoretical velocity at the outlet is -^12gH
C. Coefficient of velocity is 1/Aff
D. Coefficient of contraction is 1

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392. The formula Q=m xLx x H312 where m -= 0.405 +0.003_ was suggested by :
A. Bazin
B. Francis
C. Cipolletti
D. None of these.

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