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Process Control and Instrumentation

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

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

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Process Control and Instrumentation
Continuous measurement of specific gravity of a liquid is done by

Both A and C
Contact-type electric indicators
Displacement meter
Hydrometer

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Process Control and Instrumentation
All the thermocouples used for temperature measurement use dissimilar metal

Strips
Beads
Bars
Wires

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Process Control and Instrumentation
Liquid flow rate in an open channel can not be measured by a/an

Cipolletti weir
Orifice meter
Rectangular weir
V-notch

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Process Control and Instrumentation
An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall. This is the working principle of a

Polarograph
Polarimeter
PH meter
Chromatograph

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Process Control and Instrumentation
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is

1
0.5
1/√2
0.25

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