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Process Control and Instrumentation

Process Control and Instrumentation
__________ is the static characteristics of an instrument,

Tine lag
Dynamic error
Response
Drift

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Process Control and Instrumentation
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

Chromel-alumel
Iron-constantan
Platinum-platinum+rhodium
Either A, B or C

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Process Control and Instrumentation
Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.

> 800
< 0
> 0
< 100

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Process Control and Instrumentation
The time constant of a first order process with resistance R and capacitance C is

1/RC
RC
R + C
R - C

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Process Control and Instrumentation
Which of the following is not a second order instrument?

Mercury in glass thermometer with covering
Bare mercury in glass thermometer
None of these
Pressure gauge with one bellow, two tubes and a tank

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Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

Τds + 1
Eτds
1/(τds + 1)
E-τds

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