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Process Control and Instrumentation

Process Control and Instrumentation
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

0°
180°
90°
45°

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Process Control and Instrumentation
Which of the following does not figure in the list of seven substances selected for international temperature scale?

Zinc (B.P) and mercury (F.P)
Antimony and silver (F.P)
Ice (F.P) and steam (B.P)
Oxygen and sulphur (B.P)

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Process Control and Instrumentation
Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.

- 79 and 395
- 10 and 425
- 51 and 439
- 39 and 350

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Process Control and Instrumentation
Which of the following fluid flow measuring devices can measure the largest flow rate?

Weir
V-notch
Rotameter
Orificemeter

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Process Control and Instrumentation
Stability of a control system containing a transportation lag can be best analysed by

Routh test
Root locus methods
Frequency response methods
None of these

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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.

Sum
Difference
Ratio
Product

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