The pressure ratio in gas turbines is of the order of__________________?

Related Mcqs:

1. Pressure ratio in gas turbines is the ratio of ____________________?

   A. compressor pressure ratio
   B. highest pressure to exhaust pressure
   C. inlet pressure to exhaust pressure
   D. pressures across the turbine
   E. none of the above

2. The air-fuel ratio in gas turbines is of the order of ______________________?

   A. 7 : 1
   B. 15 : 1
   C. 30 : 1
   D. 40 : 1
   E. 50: 1

3. Maximum temprature in a gas turbine is of the order of COMPRESSORS, GAS TURBINES AND JET ENGINES______________________?

   A. 2500°C
   B. 2000°C
   C. 1500°C
   D. 1000°C
   E. 700°C

4. There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?

   A. remain same
   B. decrease
   C. increase
   D. unpredictable
   E. none of the above

5. The work ratio of a gas turbine plant is defined as the ratio of__________________?

   A. net work output and heat supplied (6) net work output and work done by tur¬bine
   C. actual heat drop and isentropic heat drop
   D. net work output and isentropic heat drop
   E. isentropic increase/drop in tempera¬ture and actual increase/ drop in temperature

6. Gas turbines for power generaion are normally used___________________?

   A. to supply base load requirements
   B. to supply peak load requirements
   C. to enable start thermal power plant
   D. in emergency
   E. when other sources of power fail

7. The fuel consumption in gas turbines is accounted for by___________________?

   A. low.er heating value
   B. higher heating value
   C. heating value
   D. higher calorific value
   E. highest calorific value

8. Mechanical efficiency of gas turbines as compared to I.C engines is____________________?

   A. higher
   B. lower
   C. same
   D. depends on on odier considerations
   E. unpredictable

9. 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
   E. unpredictable

10. 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
    E. none of the above