M C Q ON CAVITATION · 1. Cavitation is a process of (a) Liquid formation (b) Vapor formation (c) Neither vapor nor liquid formation (d) None ANS: (b) Cavitation is found in (a) An accelerated liquid flow (b) De-accelerated flow (c) Gas flow (d) None ANS: (a) […]
M C Q ON WATER HAMMER The other name of water hammer is (a) Shock wave (b) Fluid blow (c) Water blow (d) None ANS: ( c) Water hammer is due to (a) Sudden change in internal energy (b) Sudden change in potential energy (c) Sudden change in molecular energy (d) None ANS: (d) Water […]
DRAG—FACTORS ON WHICH DRAG FORCE DEPENDS, TYPES OF DRAG, MAGNITUDE OF THE DRAG FORCE AND TERMINAL VELOCITY DRAG Drag is a force of resistance when a body is moving in water or air. In air, it is called aerodynamic drag. It is expressed in Newton’s. It is always against the thrust force. It opposes forward […]
WATER HAMMER / FLUID HAMMER/HYDRAULIC SHOCK / WATER BLOW Water hammer is also called a fluid hammer or Hydraulic Shock’ or a water blow. It largely takes place in liquids but to a limited extent it can also be present in gases. It is a very high pressure wave created due to sudden change in […]
CAVITATION It is process of vapor formation (creating a void in liquid flow) in an accelerated liquid flow at a certain temperature. The accelerated flow is found in pumps and turbines etc. Due to acceleration, there is an increase in velocity and hence fall of static pressure resulting in low pressure below the saturation pressure […]
DFLUID MECHANICS: Del operator, Gradient of a function, Laplace operator, Divergence and Differences between Bernoulli’s and energy equations Del operator ∇ = (∂/∂x, ∂/∂y, ∂/∂z) Gradient is partial derivative of a function with respect to x or y or z ∂p/∂x is pressure gradient in x direction ∂p/∂y is pressure gradient in y direction ∂p/∂z […]
FLUID MECHANICS: BERNOULLI EQUATION AND MOMENTUM EQUATION Bernoulli Equation The Bernoulli equation comes from Newton’s law of motion. Assumptions used in deriving Bernoulli’s equation: Flow is steady Incompressible flow Non-viscous flow (ideal fluid with zero viscosity) No losses and no energy exchanges Bernoulli’s equation states that “Total head of a flowing fluid is constant or […]
CENTRIFUGAL COMPRESSOR, FLUID MECHANICS MECHANICAL ENGINEERING–INTERVIEW SHORT QUESTION ANSWERS–Centrifugal compressor–Slip factor, Input factor, surging, stalling and choking in an axial as well as in centrifugal compressors Explain slip factor and work input factor in a centrifugal compressor. Slip factor During the fluid flow through the impeller passage, there is a pressure difference and velocity difference […]
FLUID MECHANICS: —INTERVIEW SHORT QUESTION ANSWERS ON circulation, vorticity, Venturimeter, Orifice meter and rotameter, coefficient of discharge, Continuity equation, capillary action, lower and upper critical Reynolds numbers, measurement of discharge in Venturimeter and Orifice meter, friction coefficient in laminar and turbulent flow Define circulation. How is it different from vorticity? Circulation It is defined as […]
FLUID MECHANICS: —INTERVIEW SHORT QUESTION ANSWERS ON dynamic and kinematic viscosity, cavitation in pumps, diaphragm in a fluid flow, center of pressure and difference between center of pressure and center of gravity and metacentric height Define dynamic and kinematic viscosity and mention their units. Sr. No. Dynamic viscosity Kinematic viscosity 1. It is resistance to fluid flow. […]