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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is not a mechanical pressure sensing element?

Diaphragm
Bellows
U-tube
Bourdon tube

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Process Control and Instrumentation
Dome temperature of blast furnace stove is most accurately measured by a

Iron-constantan thermocouple
Radiation pyrometer
Platinum-platinum/rhodium ther-mocuple
Platinum resistance thermometer

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

Bulb
Bourdon tube
Pointer
None of these

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Process Control and Instrumentation
A control system has the following transfer function F(s) = (s - 1)(s + 1)/s(s - 2)(s + 4)The initial value of the corresponding time function is

-1
44020
1
43838

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Process Control and Instrumentation
Phase lag of the sinusoidal response of a first order system is

120°
180°
30°
90°

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Process Control and Instrumentation
Stroboscope is used for the measurement of

Rpm of a flywheel
Frequency of light
Depression of freezing point
Liquid level under pressure

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