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PROCESS CONTROL AND INSTRUMENTATION

Process Control and Instrumentation
Which of the following is not a mechanical pressure sensing element?

Bellows
Bourdon tube
Diaphragm
U-tube

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Process Control and Instrumentation
Cascade control means

More than one feed-back loop
One feed-back loop
On-off control
Feed forward control

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Process Control and Instrumentation
In second order underdamped system,

Overshoot increases for increasing damping co-efficient
Decay ratio = overshoot
Decay ratio = (overshoot)²
Large damping co-efficient means smaller damping

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Process Control and Instrumentation
A control system has the following transfer function F(s) = (s - 1)(s + 1)/s(s - 2)(s + 4)The initial value of the corresponding time function is

-1
1
44020
43838

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Process Control and Instrumentation
Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

Mercury thermometer
Bimetallic thermometer
Thermocouple
Radiation pyrometer

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