With increase in temperature, the vapor pressure of liquids__________________?

Related Mcqs:

1. In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure ______________ the vapor pressure of the liquid at the suction temperature?

   A. Lower than
   B. Higher than
   C. Equal to
   D. None of these

2. The excess of the sum of pressure & velocity heads over the vapor pressure of the liquid at the suction is called the___________________?

   A. Static submergence
   B. Net positive suction head (NPSH)
   C. Cavitation sensitivity
   D. Priming

3. The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which “sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis”. The centre of pressure of a rectangular surface (of width ‘w’) immersed vertically in a static mass of fluid is at a depth of (where, y = depth of the liquid) ?

   A. 1/(y/3)
   B. 2y/3
   C. 1/(y/4)
   D. 3y/4

4. Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will _____________ the gas discharge pressure?

   A. Increase
   B. Decrease
   C. Not change
   D. Exponentially decrease

5. With the increase in depth, the hydrostatic pressure in an un-accelerated incompressible fluid (in a constant gravitational field) ?

   A. Decreases
   B. Increases linearly
   C. Increases exponentially
   D. Remain constant

6. For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of_________________?

   A. 2
   B. 2
   D. 1/2

7. With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss_______________?

   A. Decreases
   B. Increases
   C. Remain constant
   D. Increases linearly

8. With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost________________?

   A. Increases
   B. Decreases
   C. Remains unchanged
   D. Increases exponentially

9. With increase in the temperature, viscosity of a liquid____________________?

   A. Increases
   B. Decreases
   C. Remain constant
   D. May increase or decrease; depends on the liquid

10. A 2″ gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is__________________?

    A. Δp
    B. < Δp
    C. > Δp
    D. Δp2