Q. In order to avoid cavitation in centrifugal pumps

View solution

Q. A hydraulic intensifier is a device used to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure.

View solution

Q. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power.The saving in case of a double acting reciprocating pump is

View solution

Q. In a reciprocating pump, air vessels are used to

View solution

Q. In a Francis turbine, the pressure at inlet is __________ that at outlet.

View solution

Q. If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

View solution

Q. A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

View solution

Q. The impeller of a centrifugal pump may have

View solution

Q. Kinematic similarity is said to exist between the model and the prototype, if both of them

View solution

Q. Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m³, Q = Discharge of the pump in m³/s, and ηo = Overall efficiency of the pump)

View solution

Q. A reciprocating pump is suitable for less discharge and higher heads.

View solution

Q. The flow ratio of Francis turbine is defined as the ratio of the

View solution

Q. The depth of the bucket for a Pelton wheel is generally __________ the diameter of jet.

View solution

Q. An impulse turbine is used for

View solution

Q. The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship, will be maximum when the relative velocity of the jet and ship is equal to twice the velocity of the ship.

View solution

Q. The cavitation in reaction turbines is avoided, to a great extent by

View solution

Q. Which type of the pump is different from others in the same group?

View solution

Q. Power required to drive a centrifugal pump is __________ proportional to N3.

View solution

Q. The force exerted (in newton) by a jetof water impinging normally on a fixed plate is (where w = Specific weight of water in N/m³, a = Cross-sectional area of jet in m², and V = Velocity of jet in m/s)

View solution

Q. A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit discharge of wheel is

View solution