In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of__________________?

A. Vacuum
B. Atmospheric air
C. Compressed air
D. Oxygen alone

In gas turbines^ high thermal efficiency is obtained in_________________?

A. Closed cycle
B. Open cycle
C. Both of the above
D. Closed/open depending on other con-siderations

A closed gas turbine in which fuel is burnt directly in the air is not possible because of__________________?

A. high pressure ratio
B. increasing gas temperature
C. high specific volume
D. high friction losses

In the axial flow gas turbine, the work ratio is the ratio of____________________?

A. Compressor work and turbine work
B. Output and input
C. Actual total head tempeature drop to the isentrpic total head drop from total head inlet to static head outlet
D. Actual compressor work and theoretical comprssor work

Water is injected in gas turbine cycle to___________________?

A. Control temperature
B. Control output of turbine
C. Control fire hazards
D. Increase efficiency

The closed cycle in gas turbines_________________?

A. Provides greater flexibility
B. Provides lesser flexibility
C. In never used
D. Is used when gas is to be burnt

The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the_____________________?

A. Adiabatic temperature drop in the stage
B. Total temperature drop
C. Total temperature drop in the stage
D. Total adiabaitc temperature drop

A gas turbine used in air craft should have______________________?

A. High h.p. and low weight
B. Low weight and small frontal area
C. Small frontal area and high h.p.
D. High speed and high h.p.

Producer gas is produced by_____________________?

A. Carbonisation of coal
B. Passing steam over incandescent coke
C. Passing air and a large amount of steam over waste coal at about 65°c
D. Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

For an irreversible gas turbine cycle, the efficiency and work ratio both depend on___________________?

A. Pressure ratio alone
B. Maximum cycle temperature alone
C. Minimum cycle temperature alone
D. Both pressure ratio and maximum cycle temperature