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

Related Mcqs:

1. A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be _______________ cms?

   A. 17
   B. 42
   C. 84
   D. 1.8

2. 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

3. Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ζ = surface tension of mercury)____________________?

   A. d
   B. 1/d
   C. ζ
   D. 1/ζ

4. 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. Q/2
   B. Q/4
   C. Q/8
   D. Q/16

5. 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 column 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

6. Capillary tube method of viscosity measurement is based on the ________________?

   A. Hagen-Poiseuille’s equation
   B. Stoke’s law
   C. Navier-stokes equation
   D. None of these

7. The capillary rise of mercury is maximum in glass tube of dia _____________ mm?

   A. 0.5
   B. 1
   C. 2
   D. 5

8. Manometers measure the ______________ pressure?

   A. Vacuum as well as the atmospheric
   B. Difference in
   C. Absolute
   D. Gage

9. A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is___________________?

   A. 5
   B. 14.1
   C. 56.22
   D. 28.2

10. Rise of liquid in a capillary tube is due to_________________?

    A. Cohesion
    B. Adhesion
    C. Both A. & B.
    D. Neither A. nor B.