Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm.

Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure.

A

Small differential

B

Atmospheric

C

Absolute

D

Gage

Minimum diameter of the tube used for making water manometer should be __________ mm to avoid a correction for the effect of capillarity.

A

1

B

2.5

C

4

D

6

The angle of contact between a glass capillary tube of length 10 cm and a liquid is 90 degree . If the capillary tube is dipped vertically in the liquid, then the liquid:

A

Will rise in the tube

B

Will get depressed in the tube

C

Will rise -up to 10 cm in the tube and will over flow

D

Will neither rise nor fall in the tube.

The angle of contact between a glass capillary tube of length 10 cm and a liquid is 90 Degree. If the capillary tube is dipped vertically in the liquid, then the liquid:

A

Will rise in the tube

B

Will get depressed in the tube

C

Will rise-up to 10 cm in the tube and will over flow

D

Will neither rise not fall in the tube

Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water coloumn in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm).

A

H

B

12.6 H

C

13.6 H

D

14.6 H

Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)

A

d

B

$$\frac{1}{{\text{d}}}$$

C

$$\sigma $$

D

$$\frac{l}{\sigma }$$

Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

A

$$\frac{{\text{Q}}}{2}$$

B

$$\frac{{\text{Q}}}{4}$$

C

$$\frac{{\text{Q}}}{8}$$

D

$$\frac{{\text{Q}}}{{16}}$$

Manometers measure the __________ pressure.

A

Vacuum as well as the atmospheric

B

Difference in

C

Absolute

D

Gage

In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.

A

Less than

B

1.25-1.50 times

C

2.5 times

D

One-fourth of

Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.

A

1.25

B

1.75

C

2.5

D

3.5

Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm.

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