A. Increases the work done
B. Decreases the work done
C. Causes cavitation
D. Results in non-uniform discharge
Related Mcqs:
- Air vessel of a reciprocating pump is initially filled with___________________?
A. Atmospheric air
B. Compressed air
C. Water
D. None of these - 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 - 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 ?
A. 40° and 140°
B. 45° and 60°
C. 90° and 80°
D. 20° and 120° - 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 - 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 - In case of a pipe exit fitted with a nozzle, the____________________?
A. Conversion of kinetic head to pressure head is facilitated
B. Conversion of pressure head to kinetic head is facilitated
C. Power transmitted through the nozzle is maximum, when the head lost due to friction in the
pipe is equal to one third of the total supply head
D. Both B. and C. - 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 - 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 - Vena-contracta pressure tapping is at a distance _______________ from the position of an orificemeter fitted in a pipe of internal diameter ‘d’ ?
A. d
B. 0.5 d
C. 2d
D. 4d - 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
