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)?

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. Very small pressure difference (< 5 mm water column) can be most conveniently measured by a/an _____________ manometer?

   A. U-tube water
   B. U-tube mercury
   C. Inclined tube mercury
   D. Inclined tube water

4. Differential manometer measures the___________________?

   A. Absolute pressure
   B. Gauge pressure
   C. Pressure difference
   D. Pressure gradient

5. Differential manometer measures the____________________?

   A. Atmospheric pressure
   B. Sub-atmospheric pressure
   C. Pressure difference between two points
   D. None of these

6. For the manometer set up shown in the figure, the pressure difference PA – PB is given by_________________?

   A. (ρH – ρair)gH
   B. (ρH – ρL)gH
   C. (ρH – ρL) gH + (ρL – ρair) . g(L – H)
   D. (ρH – ρL) gL + (ρL – ρair)gH

7. Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m3, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is________________?

   A. 90
   B. 60
   C. 45
   D. 30

8. Surge tanks are provided in high pressure water pipelines to___________________?

   A. Store a definite quantity of water all the time
   B. Reduce the water hammer
   C. Facilitate easy dismantling of pipeline for cleaning and maintenance
   D. None of these

9. If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is_________________?

   A. Same in both the tubes
   B. Greater in 1 mm dia tube
   C. Greater in 0.5 mm dia tube
   D. Zero in both the tubes

10. 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