In jet engines the products of combustion after passing through the gas lurbine are discharged into_______________? A. atmosphere B. back to the compressorC. discharge nozzle D. vacuum E. none of the above
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix i and o stand for entry and exit conditions, then in a rotary machine whose degree of reaction is…
The working fluid in ai turbine is___________________? A. in two phases B. in three phasesC. in a single phase D. in the form of air and water mixture E. gas and no air
The compression ratio in a gas turbine is of the roder of____________________? A. 3.5 : 1 B. 5 : 1C. 8 : 1 D. 12 : 1 E. 20 : 1
Ram-jet engine__________________? A. is self-operating at zero flight speedB. is not self-operating at zero^flight speed C. requires no air for its operation D. produces a jet consisting of plasma E. none of the above
A simple turbo-jet engine is basically_________________? A. a propeller systemB. gas-turbine engine equipped with a propulsive nozzle and diffuse* C. chemical rocket regine D. ram-jet enigne E. none of the above
In turbo fan engine, the jet velocity as compared to turbo-jet engine is_________________? A. less B. more C. same D. may be less or more depening upon speed E. none of the above
Pressure ratio in gas turbines is the ratio of ____________________? A. compressor pressure ratioB. highest pressure to exhaust pressure C. inlet pressure to exhaust pressure D. pressures across the turbine E. none of the above
Which of the following plants is smallest and lightest for genrating a given amount of power__________________? A. steam power plant B. petrol engine C. diesel engine’ D. solar plantE. gas turbine plant
Turbofan engine employs ____________________ ? A. one air streamB. two or more air streams C. no air stream D. solid fuel firing E. rocket principle for its operation