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MEMS 305 Final Exam Question and answers rated A+

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MEMS 305 Final Exam Question and answers rated A+ What are the 4 assumptions needed for using the Bernoulli equation? 1. Inviscid fluid 2. Steady velocity 3. Incompressible 4. Flow along a streamline Which assumptions does pipe flow violate and why? Inviscid flow, since the pipe exerts...

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  • December 27, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • MEMS 305
  • MEMS 305
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MEMS 305 Final Exam Question and
answers rated A+
What are the 4 assumptions needed for using the Bernoulli equation?
1. Inviscid fluid
2. Steady velocity
3. Incompressible
4. Flow along a streamline




Which assumptions does pipe flow violate and why?
Inviscid flow, since the pipe exerts shear stress and friction onto the moving
fluid.




Write the extended Bernoulli equation and state what each term represents.
p₁ + 1/2α₁ρv₁² + ρgz₁ = p₂ + 1/2α₂ρv₂² + ρgz₂ + f(l/D)(ρvρ²/2) + ΣKʟρv²/2


p is static pressure
1/2α₁ρv₁² is dynamic pressure
ρgz₁ is hydrostatic pressure
f(l/D)(ρvρ²/2) is major loss term
ΣKʟρv²/2 is minor loss term




Write the equation to convert a pressure in Pascals to head [m H₂0]

, h = p/(ρg)




Select which is not true about the friction factor:
a. It is a dimensionless wall shear stress
b. It is a function of surface roughness and Reynold's number for both laminar
and turbulent flow.
c. It becomes larger with increasing surface roughness
It is a function of surface roughness and Reynold's number for both laminar
and turbulent flow.




List the measurements you would need to calculate the minor loss coefficient
for water going through a filter.
ρ, v




A nozzle, orifice, and Venturi meter measure ___________________ which is
used to calculate a flow rate.
pressure differentials




Ball valves have handles / turn knobs while gate valves have handles / turn
knobs.
handles, turn knobs




The accuracy of a thermocouple is ±______ K.

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