Related Questions

The maximum number of jets generally employed in impulse turbine without jet interference is
A 4
B 6
C 8
D 12
The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.
A Same
B Less
C More
D None of these
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 hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is _______ of the jet velocity,
A One-fourth
B One-half
C Three-fourth
D Double
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 $$\frac{{{\text{wa}}{{\left( {{\text{V}} - {\text{v}}} \right)}^2}}}{{\text{g}}}$$
Braking jet in an impulse turbine is used
A To break the jet of water
B To bring the runner to rest in a short time
C To change the direction of runner
D None of these
The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.
A Same
B Less
C More
D None of these
In order to reduce the rotor speed of an impulse turbine, the method employed is
A Velocity compounding
B Pressure compounding
C Pressure-velocity compounding
D All of these
An impulse turbine as compared to a reaction turbine, for a given power has _________ row of blades.
A Equal
B Less
C More
D None of these
A contractor employed 30 men to do a piece of work in 38 days. After 25 days , he employed 5 men more and the work was finished one day earlier. How many days he would have been behind, if he had not employed additional men?
A 1
B 114
C 134
D 112

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