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Process Control and Instrumentation

Process Control and Instrumentation
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.

250
500
1000
750

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Process Control and Instrumentation
Bode stability method uses __________ loop transfer function.

Closed
Open
Either A Or B Here
Neither A nor B Here

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Process Control and Instrumentation
Which of the following thermometers is not suitable for distant reading upto 60 metres?

Constant volume gas thermometer
Vapor pressure thermometer
Mercury in glass thermometer
Resistance thermometer

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Process Control and Instrumentation
Polarisation of light forms the working principle of a

Chromatograph
Spectrometer
Polarimeter
Polarograph

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Process Control and Instrumentation
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

90°
0°
45°
180°

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Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

Air
A metal powder or graphite
Mercury
Oil

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