Question 1

\text {A line source of strength 2 \mathrm {~m} ^ { 2 } / \mathrm { s } is superposed with a velocity of $8 \mathrm {~m} / \mathrm { s }$  producing along-}slender body that resembles the one shown. The thickness h of the body is nearest:\text {slender body that resembles the one shown. The thickness h of the body is nearest:}slender body that resembles the one shown. The thickness h of the body is nearest:

Accepted Answer

A)    15 cm15 \mathrm {~cm}15 cm  
B)    20 cm20 \mathrm {~cm}20 cm 
C)    25 cm25 \mathrm {~cm}25 cm 
D)    30 cm30 \mathrm {~cm}30 cm

Question 2

\text {The pressure drop in 10 \mathrm {~m} of a turbulent flow in a pipe is $200 \mathrm {~Pa}$ . The time-average velocity,}   in the pipe at three radial locations, is measured to be:\text {in the pipe at three radial locations, is measured to be:}in the pipe at three radial locations, is measured to be: 
 uˉ( m/s) 7.247.076.72r( mm) 232527\begin{array} { c c c c } \bar { u } ( \mathrm {~m} / \mathrm { s } )  & 7.24 & 7.07 & 6.72 \r ( \mathrm {~mm} )  & 23 & 25 & 27\end{array}uˉ( m/s) r( mm) ​7.2423​7.0725​6.7227​ 
 \text {The eddy viscosity at r = 25 \mathrm {~mm} is nearest (neglect the kinematic viscosity) :}

Accepted Answer

A)    0.00163 m2/s0.00163 \mathrm {~m} ^ { 2 } / \mathrm { s }0.00163 m2/s 
B)    0.00181 m2/s0.00181 \mathrm {~m} ^ { 2 } / \mathrm { s }0.00181 m2/s 
C)    0.00192 m2/s0.00192 \mathrm {~m} ^ { 2 } / \mathrm { s }0.00192 m2/s 
D)    0.00227 m2/s0.00227 \mathrm {~m} ^ { 2 } / \mathrm { s }0.00227 m2/s

Question 3

A pressure drop of 200 kPa is measured over a 50-m-length of 2-mm-diameter pipe trans- porting 30  30∘C30 ^ { \circ } \mathrm { C }30∘C  C water. If a laminar flow exists, the flow rate is nearest:

Accepted Answer

A)   0.00195 L/s
B)   0.00243 L/s
C)   0.00732 L/s
D)   0.00991 L/s

Question 4

The equation (7.3.20)  for the head loss is valid for both laminar and turbulent flows. We wish to pump the flow rate Q through a long pipe of diameter D, to be selected. The head loss is
Proportional to what power of D, assuming a constant friction factor?

Accepted Answer

A)    D−2D ^ { - 2 }D−2 
B)    D−3D ^ { - 3 }D−3 
C)    D−4D ^ { - 4 }D−4 
D)    D−5D ^ { - 5 }D−5

Question 5

To determine boundary-layer characteristics on a body, for example the boundary-layer thickness, we must first know the potential-flow solution. The information used from the
Potential-flow solution is:

Accepted Answer

A)   The lift and drag acting on the body
B)   The pressure and velocity at the boundary of the body
C)   The shearing stress acting on the boundary of the body
D)   The normal and shearing stress acting on the boundary of the body

Question 6

Oil separates a 20-mm-diameter rotating shaft from its 20.5-mm-diameter bearing. The bearing is 80 cm long and the shaft rotates at 2000 rpm. The velocity gradient at the bearing
Surface is nearest:

Accepted Answer

A)   6840 m/s/m
B)   7260 m/s/m s
C)   8040 m/s/m
D)   9406 m/s/m

Question 7

Select the incorrect statement for an inviscid flow.

Accepted Answer

A)   The drag on a body in an inviscid flow is zero
B)   The lift on a streamlined body can be approximated by neglecting viscous effects
C)   The velocity distribution in the wake of a body can be approximated by neglecting viscous effects
D)   The normal velocity component at the boundary of a body in an inviscid flow is zero

Question 8

River water flows around circular 20-cm-diameter pier at 0.01 m/s. the flow is:

Accepted Answer

A)   Creeping flow
B)   Flow with a wake
C)   Stokes flow
D)   Low-Reynolds-number flow

Question 9

If the velocity potential in an inviscid flow is given by \phi= A y, where A is a constant, the\text {If the velocity potential in an inviscid flow is given by \phi = A y, where $\mathrm { A }$  is a constant, the}If the velocity potential in an inviscid flow is given by \phi= A y, where A is a constant, the   stream function is:\text {stream function is:}stream function is:

Accepted Answer

A)    −Ay2+B- A y ^ { 2 } + B−Ay2+B 
B)    Ax2+BA x ^ { 2 } + BAx2+B 
C)    Ay+BA y + BAy+B 
D)    −Ax+B- A x + B−Ax+B

Question 10

ext {The pump inputs 2 \mathrm { hp } into the flow.} 
  The cast-iron pipe has a total length	ext { The cast-iron pipe has a total length} The cast-iron pipe has a total length 
  	ext {of 100 \mathrm {~m}. Estimate the flow rate.}

Accepted Answer

A)    0.018 m3/s0.018 \mathrm {~m} ^ { 3 } / \mathrm { s }0.018 m3/s 
B)    0.024 m3/s0.024 \mathrm {~m} ^ { 3 } / \mathrm { s }0.024 m3/s 
C)    0.034 m3/s0.034 \mathrm {~m} ^ { 3 } / \mathrm { s }0.034 m3/s 
D)    0.042 m3/s0.042 \mathrm {~m} ^ { 3 } / \mathrm { s }0.042 m3/s

Question 11

A traffic flow on a freeway is very dense and it is proposed that possibly a fluid flow could simulate the flow. If it was decided to study the feasibility of the proposal, which flow would Be a possibility?

Accepted Answer

A)   An incompressible flow
B)   A compressible flow with M 
C)   A compressible flow with M > 1
D)   A compressible flow with M = 1

Question 12

A bomb blast sends a shock wave through the 20  20∘C20 ^ { \circ } \mathrm { C }20∘C  C atmosphere. At a certain location, the shock wave is travelling at M = 3. The induced velocity behind the wave is nearest:

Accepted Answer

A)   760 m/s
B)   620 m/s
C)   540 m/s
D)   410 m/s

Question 13

A cyclist, traveling 12 m/s, wears a helmet that is close to being a 36-cm-diameter sphere. The drag force acting on that helmet is approximately:

Accepted Answer

A)   1.8 N
B)   2.6 N
C)   3.2 N
D)   3.8 N

Exam 15: Fluid Dynamics and Aerodynamics

Correct Answer
verified

To determine boundary-layer characteristics on a body, for example the boundary-layer thickness, we must first know the potential-flow solution. The information used from the Potential-flow solution is:

Correct Answer
verified

The equation (7.3.20) for the head loss is valid for both laminar and turbulent flows. We wish to pump the flow rate Q through a long pipe of diameter D, to be selected. The head loss is Proportional to what power of D, assuming a constant friction factor?

Correct Answer
verified

A bomb blast sends a shock wave through the 20 $20 ^ { \circ } \mathrm { C }$ C atmosphere. At a certain location, the shock wave is travelling at M = 3. The induced velocity behind the wave is nearest:

Correct Answer
verified

River water flows around circular 20-cm-diameter pier at 0.01 m/s. the flow is:

Correct Answer
verified

A pressure drop of 200 kPa is measured over a 50-m-length of 2-mm-diameter pipe trans- porting 30 $30 ^ { \circ } \mathrm { C }$ C water. If a laminar flow exists, the flow rate is nearest:

Correct Answer
verified

$\text {If the velocity potential in an inviscid flow is given by \phi = A y, where \(\mathrm { A }\) is a constant, the}$ $\text {stream function is:}$

Correct Answer
verified

A cyclist, traveling 12 m/s, wears a helmet that is close to being a 36-cm-diameter sphere. The drag force acting on that helmet is approximately:

Correct Answer
verified

Select the incorrect statement for an inviscid flow.

Correct Answer
verified

$\text {The pump inputs 2 \mathrm { hp } into the flow.}$ $\text { The cast-iron pipe has a total length}$ $\text {of 100 \mathrm {~m}. Estimate the flow rate.}$

Correct Answer
verified

A traffic flow on a freeway is very dense and it is proposed that possibly a fluid flow could simulate the flow. If it was decided to study the feasibility of the proposal, which flow would Be a possibility?

Correct Answer
verified

$\text {A line source of strength 2 \mathrm {~m} ^ { 2 } / \mathrm { s } is superposed with a velocity of \(8 \mathrm {~m} / \mathrm { s }\) producing along-}$ $\text {slender body that resembles the one shown. The thickness h of the body is nearest:}$

Correct Answer
verified

Oil separates a 20-mm-diameter rotating shaft from its 20.5-mm-diameter bearing. The bearing is 80 cm long and the shaft rotates at 2000 rpm. The velocity gradient at the bearing Surface is nearest:

Correct Answer
verified

Exam 15: Fluid Dynamics and Aerodynamics

Correct AnswerverifiedShow Answer

To determine boundary-layer characteristics on a body, for example the boundary-layer thickness, we must first know the potential-flow solution. The information used from the Potential-flow solution is:

Correct AnswerverifiedShow Answer

The equation (7.3.20) for the head loss is valid for both laminar and turbulent flows. We wish to pump the flow rate Q through a long pipe of diameter D, to be selected. The head loss is Proportional to what power of D, assuming a constant friction factor?

Correct AnswerverifiedShow Answer

A bomb blast sends a shock wave through the 20 20∘C20 ^ { \circ } \mathrm { C }20∘C C atmosphere. At a certain location, the shock wave is travelling at M = 3. The induced velocity behind the wave is nearest:

Correct AnswerverifiedShow Answer

River water flows around circular 20-cm-diameter pier at 0.01 m/s. the flow is:

Correct AnswerverifiedShow Answer

A pressure drop of 200 kPa is measured over a 50-m-length of 2-mm-diameter pipe trans- porting 30 30∘C30 ^ { \circ } \mathrm { C }30∘C C water. If a laminar flow exists, the flow rate is nearest:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A cyclist, traveling 12 m/s, wears a helmet that is close to being a 36-cm-diameter sphere. The drag force acting on that helmet is approximately:

Correct AnswerverifiedShow Answer

Select the incorrect statement for an inviscid flow.

Correct AnswerverifiedShow Answer

\text {The pump inputs 2 \mathrm { hp } into the flow.} The cast-iron pipe has a total length\text { The cast-iron pipe has a total length} The cast-iron pipe has a total length \text {of 100 \mathrm {~m}. Estimate the flow rate.}

Correct AnswerverifiedShow Answer

A traffic flow on a freeway is very dense and it is proposed that possibly a fluid flow could simulate the flow. If it was decided to study the feasibility of the proposal, which flow would Be a possibility?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Oil separates a 20-mm-diameter rotating shaft from its 20.5-mm-diameter bearing. The bearing is 80 cm long and the shaft rotates at 2000 rpm. The velocity gradient at the bearing Surface is nearest:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A bomb blast sends a shock wave through the 20 $20 ^ { \circ } \mathrm { C }$ C atmosphere. At a certain location, the shock wave is travelling at M = 3. The induced velocity behind the wave is nearest:

Correct Answer
verified

Correct Answer
verified

A pressure drop of 200 kPa is measured over a 50-m-length of 2-mm-diameter pipe trans- porting 30 $30 ^ { \circ } \mathrm { C }$ C water. If a laminar flow exists, the flow rate is nearest:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

$\text {The pump inputs 2 \mathrm { hp } into the flow.}$ $\text { The cast-iron pipe has a total length}$ $\text {of 100 \mathrm {~m}. Estimate the flow rate.}$

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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