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Process Control and Instrumentation

Process Control and Instrumentation
Response of a system to a sinusoidal input is called __________ response.

Impluse
Unit step
None of these
Frequency

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Process Control and Instrumentation
A negative gain margin expressed in decibels means a/an __________ system.

None of these
Critically damped
Unstable
Stable

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Process Control and Instrumentation
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

68
54
36
12

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Process Control and Instrumentation
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

All of these
Large area but small mass
High thermal conductivity
Small specific heat

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Process Control and Instrumentation
Which of the following judges the accuracy of an instrument?

Drift
Static error
None of these
Dead zone

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Process Control and Instrumentation
Which is the most suitable instrument for measuring pressure below 3 microns?

Ionisation gauge
Mcleoid gauge
Bourdon guage
Alphatron

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