In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.

In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

A

Less than

B

More than

C

Equal to

D

None of these

In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

A

Less than

B

More than

C

Equal to

D

None of these

The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)

A

$$2{\text{gH}}$$

B

$${\text{H}}\sqrt {2{\text{g}}} $$

C

$$2{\text{g}}\sqrt {\text{H}} $$

D

$$\sqrt {2{\text{gH}}} $$

When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece and H = Height of liquid above the mouthpiece)

A

$$0.5{\text{a}}\sqrt {2{\text{gH}}} $$

B

$$0.707{\text{a}}\sqrt {2{\text{gH}}} $$

C

$$0.855{\text{a}}\sqrt {2{\text{gH}}} $$

D

$${\text{a}}\sqrt {2{\text{gH}}} $$

The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece and H = Height of liquid above the mouthpiece)

A

$$0.855{\text{a}}\sqrt {2{\text{gH}}} $$

B

$$1.855{\text{aH}}\sqrt {2{\text{g}}} $$

C

$$1.585{\text{a}}\sqrt {2{\text{gH}}} $$

D

$$5.85{\text{aH}}\sqrt {2{\text{g}}} $$

A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is

A

0.46

B

0.64

C

0.78

D

0.87

What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta?

A

0.64

B

1.65

C

0.32

D

0.94

The fluid jet discharging from a 2" diameter orifice has a diameter of 1.75" at its vena-contracta. The co-efficient of contraction is

A

1.3

B

0.766

C

0.87

D

None of these

In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be

A

Running full

B

Running free

C

Partially running full

D

Partially running free

An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.

A

Less than twice

B

More than twice

C

Less than three times

D

More than three times

In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.

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