Which is the most efficient and best for measuring very small flow rate of gases ?

Related Mcqs:

1. Cd, Cc and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficient, Cc = co-efficient of contraction = (area of jet at vena-contracta/area of opening), Cv = co-efficient of velocity = (actual velocity at vena-contracta/theoretical velocity)?

   A. Cd = Cc/Cv
   B. Cd = Cc.Cv
   C. Cd = Cv/ Cc
   D. None of these

2. 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

3. Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about__________________?

   A. 0.42
   B. 0.62
   C. 0.82
   D. 0.98

4. In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow ?

   A. Discharge of water by a centrifugal pump being run at a constant rpm
   B. Water flow in the suction and discharge pipe of a reciprocating pump
   C. Water discharge from a vertical vessel in which constant level is maintained
   D. Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

5. Bernoulli’s equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli’s equation? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible ?

   A. A, C, D
   B. B, D, E
   C. A, B, E
   D. A, D, E

6. The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a____________________?

   A. Weir
   B. Pitot tube
   C. Kennison nozzle
   D. V-notch

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 a/an _____________, the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure?

   A. Rotameter
   B. Pitot tube
   C. Venturimeter
   D. Flow nozzle

9. The energy loss in flow through Venturimeter is less than that through flow nozzle, because in case of a flow nozzle, the ?

   A. Length is shorter
   B. Throat diameter is more
   C. Sudden expansion of flow in the downstream occurs
   D. Distance between the throat and the inlet is more

10. In a fully turbulent flow (Re > 105) in a pipe of diameter ‘d’, for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is_______________?

    A. d
    B. d2
    C. d2.5
    D. d4