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

Related Mcqs:

1. 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

2. 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

3. 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

4. Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an ________________?

   A. Pitot tube
   B. Venturimeter
   C. Orificemeter
   D. Rotameter

5. Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a _________________?

   A. Pitot tube
   B. Manometer
   C. Rotameter
   D. None of these

6. Open channel liquid flow is most conveniently measured by a__________________?

   A. Hot wire anemometer
   B. Notch
   C. Rotameter
   D. Segmental orifice

7. 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

8. 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

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

   A. 4
   C. > 12.5
   D. < 10

10. Slurries can be most conveniently pumped by a _______________ pump?

    A. Screw
    B. Reciprocating
    C. Gear
    D. Centrifugal