A system may be linearized at a non-steady state point. T F Behavior of a linear

Question

A system may be linearized at a non-steady state point. T F Behavior of a linearized system is identical to that of the original nonlinear system. T F When there is intermittent on/off pumping at a fixed speed and the pumping load is mainly pipe friction (not gravity load), variable speed pumping, where the pump is always on but operating at a reduced speed, may save substantial energy. T F A reason for doing linearization is that a linear system is much easier to analyze than a nonlinear one. T F A stable nonlinear system may become unstable when magnitudes of inputs are changed. T F A stable linear system would never become unstable when magnitudes of inputs are changed. T F A deviation variable always has zero initial conditions. T F In a chemical reaction, mole balance equation is usually written for the key component. T F SCFM is a unit for measuring volume flow rate of gases. T F Thermal runaway is potentially a dangerous situation where a rise in temperature in an exothermic reaction would increase the reaction rate which would then increase the amount of heat released due to the increased reaction rate which would then increase the temperature further and so on. T F In thermally activate processes, a small change in temperature may create a very large change in the reaction rate. T F A main reason for doing an energy balance is to find a differential equation for a temperature. T F Increasing valve inlet pressure helps avoid flashing in a valve. T F An AC valve requires power to open the valve. T F Cavitation is when the bubbles formed by flashing implode causing damage to internal valve surfaces. T F Flow Coefficient C_v is the same for a valve whether a liquid or a gas flows through it. T F An equal percentage valve has an exponential relation between valve opening and flow coefficient. T F Rangeability of a valve is a measure of the width of flows the valve can control. T F A quick opening valve is not suitable for accurate flow control purposes. T F The gain of an AC (Air to Close) valve is positive. T F

Explanation / Answer

1.TRUE .because at steady state output will be constant so at non steady state we can linearize

2.FALSE because non linear systems will become linear after some modifications

4.TRUE because linear systems are easier for analysis compared to non linear systems

5.TRUE because on changing the input of the system output will change according to BIBO stability criteria

6,TRUE because as the system is linear any change in input effects output linearly implies BIBO stability is there

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