Home

What is the correct answer?

4

The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

A. 2V/(vr - v)

B. 2V/(vr + v)

C. V/(vr - v)

D. V/(vr + v)

Correct Answer :

B. 2V/(vr + v)


Related Questions

The maximum number of jets, generally, employed in an impulse turbine… Which of the following statement is correct? The function of guide vanes in a reaction turbine is to A turbine pump is basically a centrifugal pump equipped additionally with Multistage centrifugal pumps are used to obtain A Pelton wheel is Braking jet in an impulse turbine is used For starting an axial flow pump, its delivery valve should be Which of the following pump is generally used to pump highly viscous fluid? A Pelton wheel develops 1750 kW under a head of 100 metres while running… In a centrifugal pump, the liquid enters the pump The efficiency of a hydraulic press is given by (where W = Weight lifted… In a centrifugal pump, the regulating valve is provided on the The hydraulic efficiency of an impulse turbine is maximum when velocity… A hydraulic accumulator normally consists of The specific speed of a turbine is the speed of an imaginary turbine,… The flow rate in gear pump In centrifugal pumps, maximum efficiency is obtained when the blades are In an outward flow reaction turbine The specific speed of a centrifugal pump, delivering 750 litres of water… The relation between hydraulic efficiency (ηh), mechanical efficiency… The overall efficiency of a reaction turbine is the ratio of A turbine is required to develop 1500 kW at 300 r.p.m. under a head of… For 450 m head of water, _________ shall be used. The speed of a turbine runner is The mechanical efficiency of an impulse turbine is The type of centrifugal pump preferred for a specific speed of 20 r.p.m.… The maximum number of jets generally employed in impulse turbine without… Head developed by a centrifugal pump depends on The hydraulic efficiency of a reaction turbine, is the ratio of