Through inlet orifices, which are facing direction of motion of ship, water from sea can be taken by pump. We can also take sea water from pump when inlet orifices are at right angles with respect to motion of ship.

A jet strikes a curved plate at its center. Force exerted by a jet on a stationery plate happens in three cases. The three cases are classified depending on ir position. The three cases are when plate is vertical, plate is inclined and plate is curved with respect to jet.

In a jet propulsion, C_v stands for velocity coefficient. The main application in which this equation is applied is for a jet propulsion in tank with orifice. Thus, correct option is coefficient of velocity in orifice.

The relative velocity of jet is denoted as V_r1. It is relative velocity at inlet to vane. Relative velocity of inlet to vane is obtained by subtracting vectorially velocity of vane with its absolute velocity. It happens in same way for V_r2. Thus, If pressure remains a constant, n V_r1 = V_r2.

The rate of change of momentum in direction of force is given by formula pav². Where p = Density of fluid flow, a = acceleration of fluid particle and v= velocity of fluid flowing.

Force exerted by a jet on a moving plate happens in three cases. The three cases are classified depending on ir position. The propulsive force drives jet in forward direction. A good example is aircraft or a boat.

In a stationery vertical plate, jet after striking plate will move along plate. It moves with respect to angles that are developed with plate.

Jet propulsion of ship in a very shallow water is needed to avoid damage of propeller. Jet propulsion of ship is less efficient than screw propeller due to large amount of frictional losses developed in pump and pipeline.

When a force can be resolved into two components, one in direction of jet and or perpendicular to jet. The formula for force when it acts along direction of flow is equal to pav² Sin²?.

The movement of ships and boats in water is due to Jet propulsion. This mainly happens at back of ship or boat. It occurs as it exerts force on ship and boat. Thus, correct option is Jet propulsion.