The following property is most important for material used for gas turbine blade___________________?

Related Mcqs:

1. The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is_______________?

   A. low
   B. high
   C. same
   D. low/high depending on make and type
   E. unpredictable

2. The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio_____________________?

   A. increases
   B. decreases
   C. first increases and then decreases
   D. first decreases and then increases
   E. remains same

3. 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

4. As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio_____________________?

   A. increases
   B. decreases
   C. remains same
   D. first increases and then decreases
   E. first decreases and then increases

5. If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches _________________?

   A. isothermal
   B. isentropic
   C. adiabatic
   D. isochoric
   E. isobaric

6. The weight per horse power ratio for gas. turbine as compared to I.C. engine and steam turbine is________________?

   A. same
   B. higher
   C. lower
   D. uncomparable
   E. unpredictable

7. The material commonly used for air craft gas turbine is__________________?

   A. stainless steel
   B. high alloy’ steel
   C. duralumin
   D. Timken, Haste and Inconel allpys
   E. titanium

8. 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

9. The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is____________________?

   A. heated
   B. compressed air before entering the combustion chamber is heated
   C. bled gas from turbine is heated and readmitted for complete expansion
   D. exhaust gases drive the compressor
   E. part of exhaust gases are heated and mixed up with atmospheric air to utilise exhaust heat

10. The thermal efficiency of a gas turbine as compared to a diesel plant is__________________?

    A. same
    B. more
    C. less
    D. depends on other factors
    E. unpredictably