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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is a 'contact' pyrometer?

Resistance pyrometer
Optical pyrometer
Infra red pyrometer
Radiation pyrometer

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Process Control and Instrumentation
Maximum differential pressure in liquid manometer is __________ psi.

50
30
40
20

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Process Control and Instrumentation
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

63.2
95
87.5
100

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Process Control and Instrumentation
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

G/(1 + H)
H/G
H(1 + G)
G/H

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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
What is the Laplace transform of sin t ?

1/(s² - 1)
1/(s² + 1)
S/(s² + 1)
S/(s² - 1)

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