1.An air vessel in the delivery side of a reciprocating pump
(a) maintains steady discharge output
(b) prevents cavitation in the pump
(c) enables the pump to run at higher speeds
(d) enables the suction head to be increase.
2. The chief function of an air vessel in the delivery side of a reciprocating pump is to obtain
(a) reduction in suction head (b) rise in delivery head
(c) continuous supply of discharge at uniform rate
(d) increase in the discharge magnitude
3. Consider the following statements:
Air vessels are fitted to the suction side of a reciprocating pump
(1) to achieve higher speed without separation
(2) reduce work done in overcoming frictional resistance
(3) have uniform discharge
(4) avoid excessive pressure fluctuation and vibration
The correct statements are
(a) 1, 2 and 4 (b) 1 and 2 only
(c) 3 and 4 only (d) 2, 3 and 4
4. Chief objective of using air vessels in the suction side of reciprocating pumps
is to
(a) increase the delivery head
(b) reduce suction head
(c) minimise delivery head fluctuation
(d) reduce accelerating headP
5. The ram in the jigger of a hydraulic crane has a diameter of 25 cm and the
jigger has a velocity ratio of 8:1. Water is supplied to the jigger at a pressure
of 110 bars and the crane mechanism has an efficiency of 60%. (a) Estimate
the load lifted by the crane, and (b) quantity of water used when the load is
lifted through a height of 10 m. [Ans: W = 40.5 kN, V = 6.136 Litres]
