The material commonly used for air craft gas turbine is__________________?

Related Mcqs:

1. 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.
   E. all of the above

2. 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

3. 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

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. 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

6. 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

7. 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

8. A rocket works with maximum overall efficiency when air craft velocity is equal to the_________________?

   A. jet velocity
   B. twice the jet velocity
   C. half the jet velocity
   D. average of the jet velocity
   E. no such co-relationship with jet velocity exists

9. 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

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

    A. toughness
    B. fatigue
    C. creep
    D. corrosion resistance
    E. bulk modulus