What is the correct answer?


A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)

A. waVr /g × (Vr + v)

B. waVr /g × (Vr - v)

C. waVr /g × (Vr + v)²

D. waVr /g × (Vr - v)²

Correct Answer :

B. waVr /g × (Vr - v)

Related Questions

The speed ratio in case of Francis turbine varies from Any change in load is adjusted by adjusting following parameter on turbine In order to avoid cavitation in centrifugal pumps In a centrifugal pump casing, the flow of water leaving the In centrifugal pumps, maximum efficiency is obtained when the blades are The hydraulic efficiency of a reaction turbine, is the ratio of Which of the following turbine is preferred for a specific speed of 60… One horsepower is equal to Centrifugal pump is started with its delivery valve The flow rate in gear pump The type of centrifugal pump preferred for a specific speed of 20 r.p.m.… Motion of a liquid in a volute casing of a centrifugal pump is an example… If the ratio's of the corresponding forces acting at corresponding points… A hydraulic ram is a device used to Saving of work done and power by fitting an air vessel to single acting… Reaction turbines are used for A double overhung Pelton wheel has A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its… Medium specific speed of turbine implies it is Which of the following pump is preferred for flood control and irrigation… Which of the following statement is correct as regard to water wheels? According to fan laws, for fans having constant wheel diameter, the pressure… Casting of a centrifugal pump is designed so as to minimize Mechanical efficiency of a centrifugal pump is the ratio of A hydraulic intensifier normally consists of A hydraulic accumulator normally consists of The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates… Dynamic similarity is said to exist between the model and the prototype,… According to fan laws, at constant speed and capacity, the pressure and… The Fourneyron turbine is _________ reaction turbine.