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Process Control and Instrumentation

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

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

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Process Control and Instrumentation
Which of the following can measure temperatures in the range of - 20 to 300°C ?

None of these
Mercury in glass thermometer
Resistance thermometer
Vapor pressure 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.

350
550
250
700

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Process Control and Instrumentation
A stable system is the one

None of these
Which exhibits an unbounded response to a bounded input
For which the output response is bounded for all bounded input
Which satisfies the conditions for a servo problem

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Process Control and Instrumentation
Which of the following thermocouples has the least temperature measurement range?

Chromel-alumel
Copper-constantan
Iron-constantan
Platinum-platinum/rhodium

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

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

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