Ratio of pressure and inertia force gives ______________ number?

Related Mcqs:

1. 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

2. The pressure co-efficient is the ratio of pressure forces to ______________ forces?

   A. Viscous
   B. Inertial
   C. Gravity
   D. Surface tension

3. Weber number is the ratio of inertial force to _____________ force?

   A. Surface tension
   B. Gravity
   C. Viscous
   D. Elastic

4. Pressure co-efficient is the ratio of pressure forces to __________________________ forces?

   A. Gravity
   B. Inertial
   C. Viscous
   D. None of these

5. In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the _____________ efficiency?

   A. Manometric
   B. Mechanical
   C. Volumetric
   D. Overall

6. Mach number is important in a fluid flow problem, when the inertia and _____________ forces predominate?

   A. Elastic
   B. Viscous
   C. Gravity
   D. None of these

7. A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is__________________?

   A. 26
   B. 42
   C. 269
   D. 325

8. 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

9. 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

10. Which of the following relationship is valid for the equilibrium position of the float in a Rotameter? (Where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float)?

    A. Df + Bf = Wf
    B. Df = Bf + Wf
    C. Df + Bf + Wf =0
    D. None of these