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

Correct Answer: The propulsive matter is caused to flow around the propelled body

Jet propulsion is the propulsion of an object in one direction, produced by ejecting a jet of fluid in the opposite direction.
By Newton's third law, the moving body is propelled in the opposite direction to the jet.
Bissoy MCQ
#Mechanical Engineering #Compressors #Gas Turbines And Jet Engines

Related Questions

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
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 $$\frac{{{\text{wa}}{{\left( {{\text{V}} - {\text{v}}} \right)}^2}}}{{\text{g}}}$$
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 $$\frac{{\left( {{{\text{V}}_{\text{r}}} + {\text{v}}} \right){\text{v}}}}{{{{\text{V}}_{\text{r}}}}}$$
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
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 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 $$\frac{{\text{V}}}{{{{\text{V}}_{\text{r}}} + {\text{v}}}}$$
The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is
A 40%
B 50%
C 60%
D 80%
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
In air breathing jet engine, the jet is formed by expanding
A Highly heated atmospheric air
B Solids
C Liquid
D Plasma
A similar word to "propulsion" is
A energy
B compulsion
C Tight
D thrust

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