The contraction co-efficient for Borda's mouthpiece (for frictionless fluid) is

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

The coefficient of discharge in case of internal mouthpiece is __________ that of external mouthpiece.

A

Less than

B

More than

C

Equal to

D

None of these

Re-entrant or Borda's mouthpiece is an __________ mouthpiece.

A

Internal

B

External

C

Both A and B

D

None of these

The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.

A

Equal to

B

One-half

C

Three fourth

D

Double

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

An internal mouthpiece is said to be running __________ if the length of the mouthpiece is more than three times the diameter of the orifice.

A

Free

B

Partially

C

Full

D

None of these

Coefficient of contraction for an external cylindrical mouthpiece is

A

1.00

B

0.855

C

0.7H

D

0.611

The coefficient of discharge for an external mouthpiece depends upon

A

Velocity of liquid

B

Pressure of liquid

C

Area of mouthpiece

D

Length of mouthpiece

The coefficient of discharge for an external mouthpiece is

A

0.375

B

0.5

C

0.707

D

0.855

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 contraction co-efficient for Borda's mouthpiece (for frictionless fluid) is

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