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ESE CE: Fluid Mechanics Champion Quiz 5
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Question 1
Assertion (A): Reynolds number of a fluid flow is indicative of the relative dominance of the effects of momentum transfer between adjacent layers of the flow over the viscous stresses.
Reason (R): For flow at high Reynolds numbers, the velocity profile is logarithmic.
Reason (R): For flow at high Reynolds numbers, the velocity profile is logarithmic.
Question 2
Match List-I with List-II and select the correct answer using the code given below the lists:
Question 3
The transition Reynolds number for flow over a flat plate is 5 x 105. What is the distance from the leading edge at which transition will occur for flow of water with a uniform velocity of 1m/s? (For water, the kinematic viscosity, v = 0.86 x 10-6m2/s.
Question 4
Assertion (A) : The 'dimples' on a golf ball are intentionally provided.
Reason (A) : A turbulent boundary layer, since it has more momentum than a laminar boundary layer, can better resist an adverse pressure gradient.
Reason (A) : A turbulent boundary layer, since it has more momentum than a laminar boundary layer, can better resist an adverse pressure gradient.
Question 5
The average drag coefficient for a laminar boundary layer over a flat plate was obtained as 0.018. If all other factors remain unchanged, and length of the plate is increased by 4 times its original value, this average drag coefficient would change to
Question 6
Consider the following statements:
Cavitation generally results from a combination of several influences
1) by reduction of pressure intensity below a limiting value
2) by increase in either elevation or the velocity of flow
3) by reduction of pressure load in the system
4) by decrease in the velocity of flow
Which of these statements are correct?
Cavitation generally results from a combination of several influences
1) by reduction of pressure intensity below a limiting value
2) by increase in either elevation or the velocity of flow
3) by reduction of pressure load in the system
4) by decrease in the velocity of flow
Which of these statements are correct?
Question 7
Statement (I): Fluid pressure is a scalar quantity.
Statement (II): Fluid thrust always acts downwards.
Statement (II): Fluid thrust always acts downwards.
Question 8
A 0.20 m diameter pipe 20 km long transports oil at a flow rate of 0.01 m3/s. Calculate power required to maintain flow if dynamic viscosity and density of oil is 0.08 Pa.s and 900 kg/m3m respectively
Question 9
Assertion (A) : In free cylindrical vortex about a vertical axis, pressure increases with distance from axis and this increase is proportional to square of the radial distance.
Reason (R) : tangential velocity is inversely proportional to radial distance and energy of a fluid element is conserved in a free cylindrical vortex.
Reason (R) : tangential velocity is inversely proportional to radial distance and energy of a fluid element is conserved in a free cylindrical vortex.
Question 10
Match List-I (Measuring instrument) with List-II (Variable to be measured) and select the correct answer using the codes given below the lists:
List-I
A) Hot wire anemometer
B) Pitot tube
C) V-notch weir
D) Tachometer
List-II
1) Discharge
2) Rotational speed
3) Velocity fluctuations
4) Stagnation pressure
List-I
A) Hot wire anemometer
B) Pitot tube
C) V-notch weir
D) Tachometer
List-II
1) Discharge
2) Rotational speed
3) Velocity fluctuations
4) Stagnation pressure
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Aug 7ESE & GATE CE
