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Process Control and Instrumentation

Process Control and Instrumentation
The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

D⁴
D
D³
D²

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Process Control and Instrumentation
A pyrheliometer is an instrument used for measuring the

Beam radiation
None of these
Bright sunshine period
Diffuse radiation

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Process Control and Instrumentation
Number of poles in a system with transfer function 1/(s² + 2s² + 1) is

3
2
1
5

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Process Control and Instrumentation
Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the

Optical pyrometer
Alcohol filled thermometer
Mercury in glass thermometer
Iron-constantan thermocouple

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Process Control and Instrumentation
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

Kc is reduced
Kc is increased
Integral control action is introduced
Derivative control action is introduced

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Process Control and Instrumentation
Which of the following is not a second order instrument?

Pressure gauge with one bellow, two tubes and a tank
Bare mercury in glass thermometer
Mercury in glass thermometer with covering
None of these

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