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Process Control and Instrumentation

Process Control and Instrumentation
The unit of 'time constant' of a system is the same as that of

None of these
(time)⁻¹
Velocity
Time

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Process Control and Instrumentation
A control system has the following transfer function F(s) = (s - 1)(s + 1)/s(s - 2)(s + 4)The initial value of the corresponding time function is

43838
1
-1
44020

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Process Control and Instrumentation
Dead zone is the

Maximum change in the variable that does not change the reading of the instrument
Same as time constant
None of these
Same as transportation lag

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Process Control and Instrumentation
Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing

Helium
Nitrogen
Hydrogen
None of these

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Process Control and Instrumentation
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

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

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Process Control and Instrumentation
Starting temperature of optical radiation pyrometer is __________ °C.

800
1200
400
1500

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