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Process Control and Instrumentation

Process Control and Instrumentation
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

5π/12
π/3
π/12
π/6

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Process Control and Instrumentation
Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).

W = 1, Kc = 13
W = √(7/6), Kc = 46/3
W = 1/√14, Kc = 45/7√14
W = √(7/8), Kc = 45/4

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is

None of these
Pressure rise with temperature
Volumetric expansion
Linear expansion

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Process Control and Instrumentation
Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.

> 50
> 100
< 0
0-100

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Process Control and Instrumentation
In second order underdamped system,

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

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Process Control and Instrumentation
The frequency at which maximum amplitude ratio is attained is called the __________ frequency.

Cross-over
Corner
Natural
Resonant

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