Category: Process Control and Instrumentation

Gain margin is equal to the_________________?

Hamad Process Control and Instrumentation 20/12/2024

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A. Amplitude ratio
B. Reciprocal of amplitude ratio
C. Gain in P controller
D. Gain in P-I controller

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

Hamad Process Control and Instrumentation 17/12/2024

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A. 1
B. 0.5
C. 1/√2
D. 0.25

Continuous measurement of specific gravity of a liquid is done by __________________?

Hamad Process Control and Instrumentation 09/12/2024

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

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 ?

Hamad Process Control and Instrumentation 28/11/2024

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A. Nickel
B. Brass
C. Chromel
D. Invar

The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches ___________________?

Hamad Process Control and Instrumentation 26/11/2024

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A. -1
B. 0
C. 1
D. ∞

What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple ?

Hamad Process Control and Instrumentation 25/11/2024

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A. 0.1
B. 3
C. 13
D. 29

Characteristic equation is the denominator of ____________ loop transfer function?

Hamad Process Control and Instrumentation 24/11/2024

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A. Open
B. Closed
C. Both A. and B.
D. Neither A. nor B.

E.m.f. generated by thermocouples is of the order of ________________?

Hamad Process Control and Instrumentation 21/11/2024

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A. Milli volts
B. Micro volts
C. Volts
D. Kilo volts

Concentration of sugar solution can be determined by the__________________?

Hamad Process Control and Instrumentation 18/11/2024

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A. Polarimetry
B. Flame photometry
C. Emission spectroscopy
D. Oscillometry

Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop?

Hamad Process Control and Instrumentation 17/11/2024

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A. Tank 1
B. Tank 2
C. Tank 3
D. Tank 4