Thermodynamics Questions and Answers – Velocity of Pressure Pulse in a Fluid and Stagnation Properties

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This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Velocity of Pressure Pulse in a Fluid and Stagnation Properties”.

1. An incompressible fluid is one for which density does not change with change in ____
a) pressure
b) temperature
c) velocity
d) all of the mentioned
View Answer

Answer: d
Explanation: In an incompressible fluid, either density does not change or changes very little.
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2. A compressible fluid is one for which density changes with change in temperature, pressure or velocity.
a) true
b) false
View Answer

Answer: a
Explanation: This is opposite to an incompressible fluid.

3. Liquids are ____ and gases are ____
a) both are compressible
b) both are incompressible
c) incompressible, compressible
d) compressible, incompressible
View Answer

Answer: c
Explanation: Liquids are incompressible whereas gases are compressible.

4. The pressure wave velocity c is given by
a) 1 / (dp/d(density))
b) sqrt(dp/d(density))
c) sqrt(d(density)/dp)
d) (dp/d(density))
View Answer

Answer: b
Explanation: Here dp is the change in pressure.
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5. For an ideal gas, velocity of sound is given by
a) 1/ɣ*R*T
b) sqrt(1/ɣ*R*T)
c) sqrt(ɣ/RT)
d) sqrt(ɣ*R*T)
View Answer

Answer: d
Explanation: Here R is the characteristic gas constant.

6. The lower the molecular weight of fluid, ____ the value of ɣ and ____ is the sonic velocity at same temperature.
a) lower, lower
b) higher, higher
c) lower, higher
d) higher. lower
View Answer

Answer: b
Explanation: This comes from the expression of velocity of sound in an ideal gas.

7. The Mach number is given by
a) (c/V)2
b) (V/c)2
c) V/c
d) c/V
View Answer

Answer: c
Explanation: Here V is the actual velocity and c is the sonic velocity.
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8. For the isentropic stagnation state,
a) it is a reference state
b) designated with subscript zero
c) both of the mentioned
d) none of the mentioned
View Answer

Answer: c
Explanation: It is a reference state in compressible fluid flow.

9. The reference temperature To and normal temperature T are related by
a) (To/T) = 1 + (V2)/(2*cp*T)
b) (To/T) = 1 – (V2)/(2*cp*T)
c) (To/T) = 1 + (V2)/(cp*T)
d) (To/T) = 1 – (V2)/(cp*T)
View Answer

Answer: a
Explanation: Here cp is the specific heat at constant pressure and V is the actual velocity.

10. The reference temperature To and normal temperature T can be related in terms of M by
a) (To/T) = 1 + (ɣ-1)*(M2)
b) (To/T) = 1 + (ɣ-1)*(M2)/2
c) (To/T) = 1 – (ɣ-1)*(M2)/2
d) (To/T) = 1 – (ɣ-1)*(M2)
View Answer

Answer: b
Explanation: Here M is the Mach number.

Sanfoundry Global Education & Learning Series – Thermodynamics.
To practice all areas of Thermodynamics, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn