The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)

The divergent portion of a Venturimeter is made longer than convergent portion in order to

A

Avoid the tendency of breaking away the stream of liquid

B

To minimize frictional losses

C

Both (A) and (B)

D

None of these

A nozzle is said to be a divergent nozzle

A

When the cross-section of the nozzle increases continuously from entrance to exit

B

When the cross-section of the nozzle decreases continuously from entrance to exit

C

When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit

D

None of the above

The velocity of steam at throat of the nozzle is __________ the velocity of sound.

A

Equal to

B

Less than

C

More than

D

None of these

One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor's statement?

A

Having waited a day, it is too late to take an antibiotic

B

You need an antiseptic, not an antibiotic

C

You need to be vaccinated instead of taking an antibiotic

D

You are infected by a virus

If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is

A

Q = 1.71 $${\text{B}}{{\text{D}}^{\frac{1}{2}}}$$

B

Q = 1.71 BD

C

Q = 1.71 $${\text{B}}{{\text{D}}^{\frac{3}{2}}}$$

D

Q = 1.71 $${\text{B}}{{\text{D}}^{\frac{2}{3}}}$$

In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be

A

$$\frac{1}{{16}}$$ to $$\frac{1}{8}$$

B

$$\frac{1}{8}$$ to $$\frac{1}{4}$$

C

$$\frac{1}{4}$$ to $$\frac{1}{3}$$

D

$$\frac{1}{3}$$ to $$\frac{1}{2}$$

The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.

A

Plus

B

Minus

C

Divide

D

None of these

The pressure of the liquid flowing through the divergent portion of a Venturimeter

A

Remains constant

B

Increases

C

Decreases

D

Depends upon mass of liquid

The velocity of the liquid flowing through the divergent portion of a Venturimeter

A

Remains constant

B

Increases

C

Decreases

D

Depends upon mass of liquid

When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

A

Choked

B

Under-damping

C

Over-damping

D

None of these

The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)

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