Compressors Gas Turbines And Jet Engines Mcqs
Q.1: Pick up the wrong statement ?
A. centrifugal compressors deliver prac-tically constant pressure over a considerable range of capacitiesf
B. Axial flow compressors have a sub-stantially constant delivery at variable pressuresT
C. centrifugal compressors have a wider stable operating range than axial flow compressorsW
D. axial flow compressors are bigger in diameter compared to centrifugal typeJ
Q.2: Pick up the correct statement ?
A. gas turbine uses low air-fuel ratio to economise on fuel8
B. gas turhine uses high air-fuel ratio to reduce outgoing temperatureC
C. gas turbine uses low air-fuel ratio to develop the high thrust requiredG
D. all of the above
Q.3: Pick up the wrong statement ?
A. large gas turbines employ axial flow compressors0
B. axial flow compressors are more stable than centrifugal type compressors but not as efficient]
C. axial flow compressors have high capacity and efficiency8
D. axial flow compressors have instability region of operation;
Q.4: Choose the correct statement ________________?.
A. gas turbine requires lot of cooling water)
B. gas turbine is capable of rapid start up and loading4
C. gas turbines have flat efficiency at part loads/
D. gas turbines have high standby losses and require lot of maintenanceD
Q.5: Pick up the correct statement ?
A. large gas turbines use radial inflow turbines-
B. gas turbines have their blades similar to steam turbine7
C. gas .turbines blade will appear as impulse section at the hub and as a reaction section at tipa
D. gas turbines use both air and liquid cooling,
Q.6: Pick up the wrong statement ?
A. pulsojet requires no ambient air for propulsion/
B. ramjet-engine has no turbine
C. turbine drives compressor in a burbojet'
D. bypass turbo-jet engine increases the thrust without adversely affecting, the propulsive efficiency and fuel economyt
Q.7: Pick up the correct statement?
A. closed cycle gas turbine is an I.C engine)
B. gas turbine uses same working fluid over and over again7
C. air-fuel ratio in a gas turbine is 100 : 1*
D. ideal efficiency of closed cycle gas turbine plant is more than carnot cycle efficiencyW
Q.8: Pick up the false statement ?
A. gas turbine is a self-starting unit#
B. gas turbine does not require huge quantity of water like steam plantD
C. exhaust losses in gas turbine are high due to large mass flow rateB
D. overall efficiency of gas turbine plant is lower than that of a reciprocating engineT
Q.9: In jet engines the products of combustion after passing through the gas lurbine are discharged into_______________?s
A. atmosphere
B. back to the compressor
C. discharge nozzle
D. vacuum
Q.10: 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 unity______________?
A. Vi=V0B
B. Vt>V0
C. U,<V0
D. V,= U0

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