In an exothermic chemical reactor, the manipulated variable is the flow rate of

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Question
In an exothermic chemical reactor, the manipulated variable is the flow rate of
Options
A. coolant
B. reactants
C. product
D. none of these

Correct Answer

coolant

Process Control and Instrumentation problems

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1. In a second order under damped system, the
Options
A. time required for the response of first reach its ultimate value is called the response time.
B. overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e.
C. decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot.
D. characteristics of a step response is represented by

2. The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60�, then the dead time (in minutes) is
Options
A. 5?/12
B. ?/6
C. ?/12
D. ?/3

6. The offset introduced by proportional controller with gain K_cin response of first order system can be reduced by
Options
A. reducing value of K_c.
B. introducing integral control.
C. introducing derivative control.
D. none of the above.

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