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Process Control and Instrumentation

Process Control and Instrumentation
Photoelectric pyrometers are suitable in the temperature range of __________ °C.

400-1600
400-1000
800-1600
800-2500

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Process Control and Instrumentation
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?

Chromel
Nickel
Invar
Brass

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Process Control and Instrumentation
Identify an unbounded input from inputs whose transfer functions are given below

1
1/(S² + 1)
1/S²
1/S

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Process Control and Instrumentation
__________ type of element is normally not used in the bimetallic thermometers.

Single helix
Bourdon tube
Flat spiral
Multiple helix

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Process Control and Instrumentation
Silver point temperature is __________ °C.

860.5
760.5
1060.5
960.5

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Process Control and Instrumentation
The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K(s + 1)/2(2s + 1)(3s + 1) will have a definite number of loci for variation of K from 0 to ∞. The number of loci is

2
4
1
3

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