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Process Control and Instrumentation

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

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

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Process Control and Instrumentation
A non-linear chemical system is exemplified by a/an

Isothermal CSTR
Non-isothermal CSTR
Mixer
None of these

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

None of these
Stable
Critically damped
Unstable

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Process Control and Instrumentation
A system with a double pole at the origin is unstable since the corresponding term in the time domain

Grows exponentially with time
Grows linearly with time
Is a constant
Decays linearly with time

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Process Control and Instrumentation
Which of the following thermocouples is capable of measuring a temperature of -50°C?

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

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Process Control and Instrumentation
Photoelectric pyrometers are suitable in the temperature range of __________ °C.

400-1000
800-2500
400-1600
800-1600

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