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Process Control and Instrumentation

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

44020
1
-1
43838

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Process Control and Instrumentation
Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm³.

100
1
50
10

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Process Control and Instrumentation
Thermal conductivity measurement is used for the determination of

O₂ percentage in the flue gas
Composition of an alloy
CO₂ percentage in the flue gas
Specific gravity of petrofuels

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

None of these
Velocity
Time
(time)⁻¹

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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

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

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Process Control and Instrumentation
Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by __________ effect.

Thomson
Peltier
Seebeck
None of these

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