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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is never used as an element of industrial resistance thermometer?

30% iron + 70% nickel
Copper
Nickel
Lead

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Process Control and Instrumentation
The closed loop pole of a stable second order system could be

Complex conjugate with positive real parts
One real positive and the other real negative
Both real and negative
Both real and positive

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

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Process Control and Instrumentation
Pressure of 0.0001 absolute psi can be measured by __________ gauge

Pirani
Thermocouple
None of these
Mcloid

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Process Control and Instrumentation
Which of the following filled system expansion thermometer has the capability to measure the lowest temperature?

Mercury in steel thermometer
Mercury in glass thermometer
Fused metal (Na or K) in steel thermometer
Alcohol in glass thermometer

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Process Control and Instrumentation
Pyrometry refers to the measurement of temperature

With the mercurial thermometer upto 350°C
All of these
Directly
Which is of higher magnitude

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