Work ratio of a gas turbine plant is ratio of______________________?

A. Net work output and work done by turbine
B. Net work output and heat supplied
C. Work done by turbine and heat supplied
D. Work done by turbine and net work output

In the aircraft propellers __________________?

A. The propulsive matter is caused to flow around the propelled body
B. Propulsive matter is ejected from within the propelled body
C. Its functioning does not depend on presence of air
D. All of the above

Work ratio of a gas turbine may be improved by f____________________?

A. decreasing the compression work
B. increasing the compression work
C. increasing the turbine work
D. decreasing the turbine work

Reheating in gas turbine results in___________________?

A. Increase of work ratio
B. Decrease of thermal efficiency
C. Decrease of work ratio
D. Both a. and b. above

In which case the air-fuel ratio is likely to be maximum _________________?

A. 2-stroke engine
B. 4-stroke petrol engine
C. 4-stroke diesef engine
D. multi-cylinder engine

High air-fuel ratio is used in gas turbines______________________?

A. To increase the output
B. To increase the efficiency
C. To save fuel
D. To reduce the exit temperature

In jet engines the compression ratio__________________?

A. Varies as square root of the speed
B. Varies linearly to the speed
C. Varies as square of the speed
D. Varies as cube of the speed

Air-fuel ratio in a jet engine will be of the order of__________________?

A. 10: 1
B. 15: 1
C. 20 : 1
D. 60 : 1

The effective power of gas turbines is increased by adding the following in compressor__________________?

A. Ammonia and water vapour
B. Carbon dioxide
C. Nitrogen
D. Hydrogen

The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turine and fixed higher and lower temperature) with increase in pressure ratio will___________________?

A. Increase first at fast rate and then slow
B. Increase first at slow rate and then fast
C. Decrease continuously
D. First increase, reach maximum and then decrease