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Process Control and Instrumentation

Process Control and Instrumentation
Pressure of 0.01 psi (absolute) can be measured by __________ gauge.

Mcloid
None of these
Ionisation
Pirani

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

Optical pyrometer
Infra red pyrometer
Radiation pyrometer
Resistance pyrometer

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Process Control and Instrumentation
Stroboscope is used for the measurement of

Rpm of a flywheel
Liquid level under pressure
Depression of freezing point
Frequency of light

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Process Control and Instrumentation
Cascade control means

More than one feed-back loop
Feed forward control
One feed-back loop
On-off control

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?

Mercury
Carbon-tetrachloride
Water
Methyl alcohal

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

Unstable
None of these
Critically damped
Stable

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