Fluid Mechanics Sheet 21
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1) Question.
Which of the following rules are used in choosing the repeating variables in dimensional analysis ?
- Repeating variables should include the dependent variables.
- Repeating variables should contain all primary units used in describing the variables in the problem.
- Repeating variables should combine among themselves.
- Repeating variables should not contain the dependent variables.
Select the correct answer using the codes given below.
Codes :
Answer. -
2) Question.
The boundary layer thickness in turbulent flow varies as -
[ x = distance from leading edge ]
Answer. -
3) Question.
Least possible value of correction factor for
i) kinetic energy is zero
ii) kinetic energy is 1
iii) momentum is zero
iv) momentum is 1
The correct statements are -
Answer. -
4) Question.
Flow at constant rate through a tapering pipe is
i) steady flow
ii) uniform flow
iii) unsteady flow
iv) non-uniform flow
The correct answer is -
Answer. -
5) Question.
A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, then
i) the ball will move to the front
ii) the bubble will move to the front
iii) the ball will move to the rear
iv) the bubble will move to the rear
Find out which of the above statements are correct ?
Answer. -
6) Question.
The increase in metacentric height
i) increases stability
ii) decreases stability
iii) increases comfort for passengers
iv) decreases comfort for passengers
The correct answer is -
Answer. -
7) Question.
Examine the following four statements -
1. Surface tension is due to cohesion only.
2. Capillarity is due to adhesion only.
3. Surface tension is due to both cohesion and adhesion.
4. Capillarity is due to both cohesion and adhesion.
Answer.
