MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Aerodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The characteristic Mach number and Mach number are related. Which of these is not correct? |
| A. | M=1, M*=1 |
| B. | M<1, M*<1 |
| C. | M<1, M*<1 |
| D. | M , M* 0 |
| Answer» E. | |
| 2. |
The characteristic Mach number is constant for a given value of temperature and gamma. |
| A. | False |
| B. | True |
| Answer» B. True | |
| 3. |
10.The properties of a flow with subscript * denotes M=1. Which of these is the correct ratio for a flow with gamma= 1.4? |
| A. | ( frac {T^*}{T_0} )=0.528 |
| B. | ( frac {P^*}{P_0} )=0.833 |
| C. | ( frac { rho ^*}{ rho_0} )=0.634 |
| D. | Data inadequate |
| Answer» D. Data inadequate | |
| 4. |
The definitions of P0 and 0 involve______ |
| A. | Isothermal compression |
| B. | Isentropic compression |
| C. | Adiabatic compression |
| D. | Any process gives the same value |
| Answer» C. Adiabatic compression | |
| 5. |
For a calorically perfect gas, the ratio of stagnation to static temperature depends upon_______ |
| A. | |
| B. | , M |
| C. | M |
| D. | R, M |
| Answer» C. M | |
| 6. |
Select the incorrect statement for the properties concerned with a flow. |
| A. | a* and a<sub>0</sub> are constant at a point |
| B. | a* and a<sub>0</sub> are constant along the streamline for an adiabatic, inviscid, steady flow |
| C. | a* and a<sub>0</sub> are constant along the entire flow for an adiabatic, inviscid, steady flow |
| D. | a* and a<sub>0</sub> are related but not equal |
| Answer» D. a* and a<sub>0</sub> are related but not equal | |
| 7. |
The incorrect relation for properties associated with the flow, for a point in the flow where the speed of sound is a, is_______ |
| A. | ( frac { gamma +1}{2( gamma -1)} ) a<sup>*2</sup>= ( frac {a_0^2}{ gamma -1} ) const |
| B. | ( frac { gamma +1}{2( gamma -1)} ) a<sup>*2</sup>=const |
| C. | ( frac {a_0^2}{ gamma -1} )=const |
| D. | ( frac { gamma +1}{2( gamma -1)} ) a<sup>*2</sup>= ( frac {a_0^2}{ gamma -1} )=const |
| Answer» B. ( frac { gamma +1}{2( gamma -1)} ) a<sup>*2</sup>=const | |
| 8. |
The correct statement for a point where the speed of sound is a, is_______ |
| A. | a* is the stagnation speed of sound |
| B. | a* is the maximum speed of sound |
| C. | a<sub>0</sub> is the characteristic speed of sound |
| D. | a<sub>0</sub> is the stagnation speed of sound |
| Answer» E. | |
| 9. |
Which is not the correct reason for sound of speed being higher in helium than in air at the same temperature? |
| A. | for helium is higher than air |
| B. | Gas constant is same for both |
| C. | Helium is lighter than air |
| D. | R for helium is much larger than for air |
| Answer» C. Helium is lighter than air | |
| 10. |
The isothermal compressibility is given as___________ |
| A. | Same as isentropic compressibility |
| B. | ( frac {1}{p} ) |
| C. | ( frac {1}{ gamma p} ) |
| D. | ( frac { rho }{p} ) |
| Answer» C. ( frac {1}{ gamma p} ) | |
| 11. |
For a perfect gas, if we half the density, keeping the temperature same the speed of sound changes. This is due to the change in pressure. |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
For a non-perfect gas, if we double the pressure while keeping the temperature same, the speed of sound remains the same. |
| A. | False |
| B. | True |
| Answer» B. True | |