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Process Control and Instrumentation

Process Control and Instrumentation
The response of two tanks of same size and resistance in series is

Over damped
None of these
Under damped
Critically damped

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

1/(τds + 1)
Τds + 1
E-τds
Eτds

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Process Control and Instrumentation
Flame photometry is used for the determination of compositional analysis of

Solids
Natural gas
Alkali metals
Isotopes

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Process Control and Instrumentation
Out of the following themocouple wire insulating material, the highest temperature rating is for

Asbestos
Ceramic fibre
Fibre glass
Teflon

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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)

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

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Process Control and Instrumentation
Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called

Semi conductors
Conductors
Insulators
Dielectrics

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