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Process Control and Instrumentation

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

Τds + 1
1/(τds + 1)
E-τds
Eτds

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Process Control and Instrumentation
Which of the following is never used as an element of industrial resistance thermometer?

Lead
Nickel
30% iron + 70% nickel
Copper

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Process Control and Instrumentation
Liquid argon level in a pressurised storage tank (at 3 kg/cm² ) is measured by a/an

None of these
Differential pressure gage
External float gage
Gage glass

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Process Control and Instrumentation
Nichol's chart deals with

R. vs. phase lag of second order
Frequency response values of controllers
R. vs. phase lag of first order
Closed loop values vs. open loop values

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Process Control and Instrumentation
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.

Decrease
Exponential decrease
Increase
No change

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

1200
400
800
1500

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