Related Questions

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 $$\frac{{2\left( {{{\text{V}}_{\text{r}}} - {\text{v}}} \right){\text{v}}}}{{{\text{V}}_{\text{r}}^2}}$$
B $$\frac{{2\left( {{{\text{V}}_{\text{r}}} + {\text{v}}} \right){\text{v}}}}{{{\text{V}}_{\text{r}}^2}}$$
C $$\frac{{\left( {{{\text{V}}_{\text{r}}} - {\text{v}}} \right){\text{v}}}}{{{{\text{V}}_{\text{r}}}}}$$
D $$\frac{{\left( {{{\text{V}}_{\text{r}}} + {\text{v}}} \right){\text{v}}}}{{{{\text{V}}_{\text{r}}}}}$$
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 $$\frac{{2{\text{v}}}}{{{{\text{V}}_{\text{r}}} - {\text{v}}}}$$
B $$\frac{{2{\text{v}}}}{{{{\text{V}}_{\text{r}}} + {\text{v}}}}$$
C $$\frac{{\text{V}}}{{{{\text{V}}_{\text{r}}} - {\text{v}}}}$$
D $$\frac{{\text{V}}}{{{{\text{V}}_{\text{r}}} + {\text{v}}}}$$
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity
A One-half
B One-third
C Two-third
D Three-fourth
In jet propulsion power unit, the inlet duct of diverging shape is used in order to
A Collect more air
B Convert kinetic energy of air into pressure energy
C Provide robust structure
D Beautify the shape
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 $$\frac{{{\text{wa}}\left( {{\text{V}} - {\text{v}}} \right)}}{{2{\text{g}}}}$$
B $$\frac{{{\text{wa}}\left( {{\text{V}} - {\text{v}}} \right)}}{{\text{g}}}$$
C $$\frac{{{\text{wa}}{{\left( {{\text{V}} - {\text{v}}} \right)}^2}}}{{2{\text{g}}}}$$
D $$\frac{{{\text{wa}}{{\left( {{\text{V}} - {\text{v}}} \right)}^2}}}{{\text{g}}}$$
If the sum of two adjacent angles is equal to two right angles, then the two angles are ----
A adjacent angles
B straight angles
C supplementary angles
D condemnatory angles
In a jet propulsion
A The propulsive matter is ejected from within the propelled body
B The propulsive matter is caused to flow around the propelled body
C Its functioning does not depend upon presence of air
D None of the above
In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into
A Atmosphere
B Vacuum
C Discharge nozzle
D Back to the compressor
The thrust of a jet propulsion power unit can be increased by
A Injecting water into the compressor
B Burning fuel after gas turbine
C Injecting ammonia into the combustion chamber
D All of the above
The maximum propulsion efficiency of a turbojet is attained at around following speed
A 550 km/hr
B 1050 km/hr
C 1700 km/hr
D 2400 km/hr

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