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Compressible Flow (Part I)

Authored by TS Lee

Engineering

University

5 Questions

Used 2+ times

Compressible Flow (Part I)
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1.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

The speed of sound in an ideal gas depends on?

Note: You may select more than one option.

√T, where T is absolute temperature.

√T, where T is temperature in degree Celcius.

√k, where k is the specific heat ratio.

√R, where R is the gas constant.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is incorrect for an airfoil moving at a speed less than the speed of sound, c?

The upstream fluid can sense that the airfoil is coming

There is a smooth flow over the airfoil

A shock wave is formed by nature

The pressure disturbances are attenuated over a distance Δt(c-V)

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

Which of the following is correct for a doppler effect?

The source is moving faster than the speed of sound.

The observer at A will detect a sound pulse frequency that is higher than the frequency emitted by the moving sound source

The observer at A will not detect the sound source until the source has passed

4.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What type of flow occurs when the Mach number is greater than one?

Transonic flow

Sonic flow

Supersonic flow

Hypersonic flow

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

What does the Ttotal in the Mach number relation mean?

The temperature recognised by the thermometer moving with the flowing fluid

The temperature that would arise if the fluid velocity were brought to zero

The temperature of the fluid as it undergoes a change in elevation

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