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Process Control and Instrumentation

Process Control and Instrumentation
The open loop transfer function of a control system is KR/(1 + TS) . This represents

Dead time system
A first order system
A first order time lag
A second order system

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

760.5
860.5
960.5
1060.5

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Process Control and Instrumentation
Pick out the first order system from among the following.

Interacting system of two tanks in series
Non-interacting system of two tanks in series
Damped vibrator
Mercury in glass thermometer kept in boiling water

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Process Control and Instrumentation
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

Difference
Ratio
Sum
Product

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Process Control and Instrumentation
The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

π/6
π/12
π/3
5π/12

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Process Control and Instrumentation
Bourdon tube is never made of

Cast iron
Phosphor bronze
Stainless steel
Monel metal

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