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.Management Sciences
Category: Fluid Mechanics
Which of the following has highest coefficient of discharge ?
A. sharp edged orifice
B. venturimeter
C. Borda’s mouthpiece running full
D. CipoUetti weir
Coefficient of velocity of venturimeter_________________?
A. is independent of Reynolds number
B. decreases with higher Reynolds number
C. is equal to the coefficient of discharge of venturimeter
D. none of the above
In a forced vortex motion, the velocity of flow is________________?
A. directly proportional to its radial distance from axis of rotation
B. inversely proportional to its radial distance from the axis of rotation
C. inversely proportional to the square of its radial distance from the axis of rotation
D. directly proportional to the square of its radial distance from the axis of rotation
If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be___________________?
A. from reservoir A to reservoirs B and C
B. from reservoir B to reservoirs C and A
C. from reservoir C to reservoirs A and B
D. unpredictable
The Prartdtl mixing length is_________________?
A. zero at the pipe wall
B. maximum at the pipe wall
C. independent of shear stress
D. none of the above
The horizontal component of force on a curved surface is equal to the_______________?
A. product of pressure intensity at its centroid and area
B. force on a vertical projection of the curved surface
C. weight of liquid vertically above the curved surface
D. force on the horizontal projection of the curved surface
The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is__________________?
A. laminar flow
B. transition flow
C. turbulent flow
D. not predictable from the given data
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is_______________?
A. 1/3 R
B. 1/2 R
C. 2/3 R
D. 3/4R
where R is the radius of pipe
With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on__________________?
A. a circular disc of plate held normal to flow
B. a sphere
C. a cylinder
D. a streamlined body
Separation of flow occurs when_________________?
A. the pressure intensity reaches a minimum
B. the cross-section of a channel is reduced
C. the boundary layer comes to rest
D. all of the above
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