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Process Control and Instrumentation

Process Control and Instrumentation
Thermocouple is suitable for measuring

Both high and low temperatures
Liquid temperatures only
Very high temperatures only
Very low temperatures only

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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
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?

13
0.1
3
29

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Process Control and Instrumentation
Phase lag of the sinusoidal response of a first order system is

180°
30°
90°
120°

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Process Control and Instrumentation
Thermistors are made of

Ultra pure metals
Iron-copper alloys
Nickel-chromium alloys
Metal oxides

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Process Control and Instrumentation
Response of a linear control system for a change in set point is called

Regulator problem
Frequency response
Servo problem
Transient response

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