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PROCESS CONTROL AND INSTRUMENTATION

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

Diaphragm
Bellows
Bourdon tube
U-tube

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Process Control and Instrumentation
Cascade control means

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

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Process Control and Instrumentation
In second order underdamped system,

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

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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
44020
1
43838

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

Bimetallic thermometer
Mercury thermometer
Thermocouple
Radiation pyrometer

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