At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump ?

Related Mcqs:

1. A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double___________________?

   A. Head
   B. Discharge
   C. Efficiency
   D. None of these

2. A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit E. to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062 ?

   A. 10 m
   B. 11 m
   C. 11.8 m
   D. 30 m

3. Air vessel of a reciprocating pump is initially filled with___________________?

   A. Atmospheric air
   B. Compressed air
   C. Water
   D. None of these

4. Function of air vessel provided in a reciprocating pump is to_________________?

   A. Reduce discharge fluctuation
   B. Reduce the danger of cavitation
   C. Avoid the necessity of priming
   D. Increase the pump efficiency

5. Air vessel provided in a reciprocating pump is for__________________?

   A. Increasing the acceleration head
   B. Making the friction in pipe uniform
   C. Decreasing the acceleration head
   D. None of these

6. A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump_________________?

   A. Develops a lower head
   B. Capacity is reduced
   C. Requires more power
   D. All A., B. and C.

7. A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now_________________?

   A. Increase
   B. Decrease
   C. Remain same
   D. Data insufficient to predict

8. Air vessel fitted to a reciprocating pump____________________?

   A. Increases the work done
   B. Decreases the work done
   C. Causes cavitation
   D. Results in non-uniform discharge

9. Air vessel provided in a reciprocating pump__________________?

   A. Smoothens the flow by avoiding pulsations
   B. Increases the volumetric efficiency of the pump
   C. Saves the pump from the danger of cavitation
   D. None of these

10. 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