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WorksheetsFundamentals of compressible flow (CO1)
Total questions: 15
Worksheet time: 6mins
Match the following
Mach No > 5
Hypersonic
Mach No < 0.3
Incompressible/Subsonic
Mach No = 1
Sonic flow
0.8 < Mach No < 1.2
Transonic
During a high-speed test flight, Kadhar and Kishore are observing an aircraft that is traveling faster than the speed of sound. The lines at which the pressure disturbance is concentrated and generate the cone are called
Sound waves
Disturbance waves
Expansion waves
Mach waves
In a perfectly insulated environment, Lokesh observes that the gas expands without heat exchange. Which conditions are true for this isentropic process?
Frictionless adiabatic process
change in entropy > 0
change in entropy = 0
Irreversible process
In a wind tunnel experiment, Kadhar is studying air flow around a model airplane. He needs to determine the correct form of the Compressible Bernoulli's equation to analyze the pressure and velocity of the air over the wings. Which equation should he use?
ργ−1γp+2v2=const.
h+2v2=h0
h=CpT
ρp+2v2=const.
In a laboratory, Jagadeesh studies gases alongside Aisha. He learns that for a (a) perfect gas, Cp and Cv are constants and independent of temperature.
Match the following
change in entropy > 0
irreversible process
change in entropy = 0
reversible process
change in entropy < 0
impossible process
Lokesh and his friends are by a lake, enjoying nature. Lokesh says the sound of the waves is a weak compression wave with only small changes in flow properties. Is this statement true or false?
True
False
While conducting an experiment on sound waves, Aanya discovers that shock waves behave differently than expected. She learns that shock waves are non-isentropic. True or False?
True
False
During a flight test, Jagadeesh observed that the local flow speed of the aircraft was different from the speed of sound. The ratio of the local flow speed to the critical speed of sound is called _____ ____ number.
(a)
In a wind tunnel, Atchaya observes that as air passes through a converging section, the velocity of the subsonic airflow changes. She wonders how this affects the airflow.
decrease
increase
unalter
During a high-speed test flight, pilot Jagadeesh notices that as the aircraft enters a diverging passage in the wind tunnel, the velocity of the supersonic flow will ____.
increase
unalter
decrease
In a wind tunnel, Kadhar and Kanazhi are testing a new aerodynamic design for their engineering project. They observe that the Mach number at the throat is unity, and the mass flow rate is at its maximum. What is this condition called?
isentropic flow
Rayleigh flow
Fanno flow
Choked flow
Kanazhi was testing a nozzle design for a new irrigation system and found that the nozzle exit pressure was higher than the back pressure. The nozzle is said to be ____ in this situation.
over expanded
under expanded
completely expanded
choked
When Atchaya and her friends are on a boat trip, waves are emitted from the boat and travel outward at the velocity of (a) .
Atchaya launched a model rocket at supersonic speed. The air around it adjusted rapidly, resulting in the formation of (a) .
