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.Management Sciences
Category: Fluid Mechanics
Coefficient of contraction for an external cylindrical mouthpiece is_________________?
A. 1.00
B. 0.855
C. 0.7H
D. 0.611
Stanton diagram is a______________?
A. log-log plot of friction factor against Reynolds number
B. log-log plot of relative roughness against Reynolds number
C. semi-log plot of friction factor against Reynolds number
D. semi-log plot of friction factor against relative roughness
The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is_________________?
A. d > m > e
B. d > e > m
C. e > m > d
D. e > d > m
The increase in meta centric height_________________?
1. increases stability
2. decreases stability
3. increases comfort for passengers
4. decreases comfort for passengers
The correct answer is?
A. (1) and (3)
B. (1)and(iv)
C. (2) and (3)
D. (2) and (4)
For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is________________?
A. directly proportional to Reynolds number and independent of pipe wall roughness
B. directly proportional to pipe wall roughness and independent of Reynolds number
C. inversely proportional to Reynolds number and indpendent of pipe wall roughness
D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness
In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is_________________?
A. 22.5 m/sec
B. 33 m/sec
C. 40 m/sec
D. 90 m/sec
Equation of continuity is based on the principle of conservation of_________________?
A. mass
B. energy
C. momentum
D. none of the above
The losses are more in_________________?
A. laminar flow
B. transition flow
C. turbulent flow
D. critical flow
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