INSTRUMENTATION AND CONTROL ENGINEERING

1) Define Viscosity. It is a measure of fluidity of the system. Many fluids undergo continuous deformation with the application of shearing stress. 2) Define Newtonian fluids If the force flow relation is linear then the fluid is Newtonian . 3) Define Non Newtonian fluids If the force flow relation is non linear then the fluid is Newtonian . 4) Define Kinematic Viscosity. Ratio of absolute viscosity to the density of the fluid. 5) Define Specific Viscosity. Ratio of absolute viscosity of the fluid to the absolute viscosity of a standard fluid at the same temperature. 6) Define Relative Viscosity. Ratio of absolute viscosity of the fluid at a given temperature to the absolute viscosity of a standard fluid at 20°c. 7) Define Viscosity index It is an empirical number that indicates the effect of change of temperature on viscosity if a fluid. 8) Define fluidity. It is the reciprocal of viscosity. It is unit is 1/ poise. 9) Define Humidity. It is basically moisture cont...

1. List any four objectives of process control. Suppressing the influence of external disturbances, Optimizing the performance, Increasing the productivity, Cost effective. 2. Define process Any system comprised of dynamic variables usually involved in manufacturing and production operations. It is defines as a series of operations during which some materials are placed in more useful state. 3. What is manipulated variable It is a variable which is altered by the automatic control equipment so as to change the variable under and make it conform with the desired value. 4. Define Controlled variable It is the quantity of control system which is directly measured and controlled. 5. What do you mean by self regulation? The output will move from one steady state to another for the sustained change in input. This means that for change in some input variable the output variable will rise until it reaches a steady state (inflow = outflow). It is the tendency of the process to adopt a ...