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Process Control and Instrumentation

Process Control and Instrumentation
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

36
12
54
68

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Process Control and Instrumentation
A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in

Current
Voltage
Flux density
Light intensity

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Process Control and Instrumentation
The frequency response of a first order system, has a phase shift with lower and upper bounds given by

- ∞, π/2
-π/2, 0
-π/2, π/2
0, π/2

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Process Control and Instrumentation
Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).

W = 1/√14, Kc = 45/7√14
W = 1, Kc = 13
W = √(7/6), Kc = 46/3
W = √(7/8), Kc = 45/4

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Process Control and Instrumentation
The __________ of a vapor pressure thermometer is a primary element.

Bourdon tube
None of these
Pointer
Bulb

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Process Control and Instrumentation
Flow rate of a river is measured by a/an

Kennison nozzle
Open weir
Pitot tube
Vane meter

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