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.Management Sciences
Category: Fluid Mechanics for Chemical
For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the___________________?
A. Square of the radial distance
B. Radial distance linearly
C. Inverse of the radial distance
D. Elevation along vertical direction
The co-efficient of drag and lift for an incompressible fluid depends on the_________________?
A. Reynolds number
B. Froude number
C. Mach number
D. All A., B. and C.
Acceleration head in a reciprocating pump_______________________?
A. Increases the work done during delivery stroke
B. Decreases the work done during suction stroke
C. Does not change the work requirement of the pump
D. Increases the work done during suction stroke
Pressure drop in a packed bed for laminar flow is given by the ______________ equation?
A. Kozeny-Carman
B. Blake-Plummer
C. Leva’s
D. Fanning friction factor
Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will_______________?
A. Increase
B. Decrease
C. Remain unchanged
D. Increase or decrease depending on the pipe material
Transition from laminar flow to turbulent flow is aided by the__________________?
A. Surface roughness and curvature (i.e. sharp corners)
B. Vibration
C. Pressure gradient and the compressibility of the flowing medium
D. All A., B. & C.
Newton’s law of viscosity relates the____________________?
A. Shear stress and velocity
B. Velocity gradient and pressure intensity
C. Shear stress and rate of angular deformation in a fluid
D. Pressure gradient and rate of angular deformation
Piezometric head is the sum of the ______________ heads?
A. Elevation & kinetic energy
B. Elevation & pressure
C. Kinetic energy & pressure
D. None of these
An ideal nozzle design aims at________________?
A. Minimising wall friction
B. Suppressing boundary layer separation
C. Both A. & B.
D. Neither A. nor B.
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