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 $$\frac{{{\text{wa}}{{\left( {{\text{V}} - {\text{v}}} \right)}^2}}}{{\text{g}}}$$
In air breathing jet engine, the jet is formed by expanding
A Highly heated atmospheric air
B Solids
C Liquid
D Plasma
The efficiency of jet engine is
A Lower at low speed
B Higher at high altitudes
C Same at all altitudes
D Higher at high speed
In turbo fan engine, the jet velocity as compared to turbojet engine is
A Less
B More
C Same
D May be less or more depending upon speed
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
A Heat rejection is lower
B Expansion and compression are isentropic
C Combustion is at constant volume
D Maximum temperature is higher
Thermal efficiency of a two stroke cycle engine is _________ a four stroke cycle engine.
A Equal to
B Less than
C Greater than
D None of these
The thermal efficiency of a petrol engine is _________ as compared to diesel engine.
A Same
B Less
C More
D None of these
The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be
A More
B Less
C Same
D Data insufficient to predict
একটি ইঞ্জিন তাপ আধারে 45 kJ তাপ ছেড়ে দেয় এবং 15 kJ কাজ সম্পন্ন করে। ইঞ্জিনটির কর্মদক্ষতা কত? (An engine does 15 kj of work while rejecting 45 kg to the heat sink. What is the efficiency of the engine?)
A 67%
B 25%
C 50%
D 45%

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