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Aerodynamics
Aerodynamics Objective
Quiz 1
Solution
Q.1.
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
Q.2.
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
Q.3.
Which is not the correct reason for sound of speed being higher in helium than in air at the same temperature?
a) γ 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
Q.4.
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) a0 is the characteristic speed of sound
d) a0 is the stagnation speed of sound
Q.5.
Select the incorrect statement for the properties concerned with a flow.
a) a* and a0 are constant at a point
b) a* and a0 are constant along the streamline for an adiabatic, inviscid, steady flow
c) a* and a0 are constant along the entire flow for an adiabatic, inviscid, steady flow
d) a* and a0 are related but not equal
Q.6.
For a calorically perfect gas, the ratio of stagnation to static temperature depends upon_______
a) γ
b) γ , M
c) M
d) R, M
Q.7.
The definitions of P0 and ρ0 involve______
a) Isothermal compression
b) Isentropic compression
c) Adiabatic compression
d) Any process gives the same value
Q.8.
The characteristic Mach number is constant for a given value of temperature and gamma.
a) False
b) True
Q.9.
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
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