1. The ratio of the net work obtained from the gas turbine plant ?

compression ratio

work ratio

pressure ratio

none of these

Answer: work ratio

Explanation:


2. Intercooling in gas turbines ?

decreases net output but increases thermal efficiency

increases net output but decreases thermal efficiency

decreases net output and thermal efficiency both

increases net output and thermal efficiency both

Answer: increases net output and thermal efficiency both

Explanation:


3. The type of rotary compressor used in gas turbines, is of ?

centrifugal type

axial flow type

radial flow type

none of these

Answer: axial flow type

Explanation:


4. Gas turbine as compared to steam turbine ?

requires less space for installation

has compressor and combustion chamber

has less efficiency

all of these

Answer: all of these

Explanation:


5. Euler's equation can be used for ?

radial flow compressors

axial flow compressors

pumps

all of these

Answer: all of these

Explanation:


6. A closed cycle gas turbine consists of a ?

compressor

heating chamber

cooling chamber

all of these

Answer: all of these

Explanation:


7. Which of the following bladings will give maximum pressure rise in a centrifugal compressor, assuming the same overall dimensions, blade inlet angle and rotational speeds ?

Forward curved blades

Backward curved blades

Radial blades

all of these

Answer: Forward curved blades

Explanation:


8. Rotary compressors are used for delivering ?

small quantities of air at high pressures

large quantities of air at high pressures

small quantities of air at low pressures

large quantities of air at low pressures

Answer: large quantities of air at low pressures

Explanation:


9. High air-fuel ratio in gas turbines ?

increases power output

improves thermal efficiency

reduces exhaust temperature

do not damage turbine blades

Answer: reduces exhaust temperature

Explanation:


10. Only rocket engines can be propelled to space because ?

they can generate very high thrust

they have high propulsion efficiency

these engines can work on several fuels

they are not air-breathing engines

Answer: they are not air-breathing engines

Explanation: