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Process Control and Instrumentation

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

R + C
R - C
1/RC
RC

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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
E-τds
1/(τds + 1)

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Process Control and Instrumentation
Mercury thermometer can be used to measure the temperature upto __________ °C.

100
350
250
750

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Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is

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

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Process Control and Instrumentation
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

87.5
100
95
63.2

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Process Control and Instrumentation
Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)

V/nRT
nRT/P
p/nRT
nRT/V

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