Hydraulic Machines

The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

A. `(2(V_r - V)V)/(V_1^2)`
B. `(2(V_r + V)V)/(V_1^2)`
C. `((V_r - V)V)/(V_r)`
D. `((V_r + V)V)/(V_r)`


A jet of water enters and leaves a fixed curved vane tangentially. The force of the jet along normal to the vane is (where `alpha` and `beta` = Inlet and outlet angles of the jet respectively)

A. `(waV^2)/(g) (cos alpha - cos beta)`
B. `(waV^2)/(g) (cos alpha + cos beta)`
C. `(waV^2)/(g) (sin alpha + sin beta)`
D. `(waV^2)/(g) (sin alpha - sin beta)`


The unit speed of the turbine runner is

A. `N/sqrt(H)`
B. `N/H`
C. `N/H^(3//2)`
D. `N/H^2`


The number of buckets on the periphery of a Pelton wheel is given by

A. `(D)/(2d) + 5`
B. `(D)/(2d) + 10`
C. `(D)/(2d) +15`
D. `(D)/(2d) + 20`

The force exerted by a jet of water impinging normally on a plate which due to the impact of jet, moves in the direction of jet with a velocity v is
A. `(wa(V -v))/(2g)`
B. `(wa(V -v))/(g)`
C. `(wa(V -v)^2)/(2g)`
D. `(wa(V -v)^2)/(g)`