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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following controllers has the least maximum deviation?

P-I controller
P-I-D controller
P-controller
P-D controller

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Process Control and Instrumentation
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?

Radiation/infrared pyrometer
Thermo electric pyrometer
Filled system thermometer
Mercury in glass thermometer

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

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

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Process Control and Instrumentation
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.

250
700
350
550

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Process Control and Instrumentation
The open loop transfer function of a control system is KR/(1 + TS) . This represents

A first order system
A second order system
A first order time lag
Dead time system

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Process Control and Instrumentation
Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively

32° & 460°
32° & 80°
0° & 80°
- 273° & 80°

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