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.Management Sciences
Category: Process Control and Instrumentation
Bourdon gauges are used for measuring pressure (kg/cm2) ?
0
A. < atmospheric
B. > 2 (gauge)
C. 10 (absolute)
What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1.H2 ?
A. 1/(1 + GH)
B. G/(1 + GH)
C. H/(1 + GH)
D. G/(1 – GH)
Which of the following is a desirable characteristic of an instrument ?
A. High drift
B. High fidelity
C. High measuring lag
D. Poor reproducibility
Non-metallic diaphragm used as pressure sensor in instruments is generally made of__________________?
A. Teflon
B. Synthetic rubber
C. Bakelite
D. Thick paper
Composition of alloys can be determined by _________________?
A. Polarograph
B. Chromatograph
C. Refractometer
D. None of these
Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1) ?
A. w = 1/√14, Kc = 45/7 √14
B. w = √(7/6), Kc = 46/3
C. w = 1, Kc = 13
D. w = √(7/8), Kc = 45/4
Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their ?
A. Low thermal conductivity
B. Low electrical conductivity
C. High viscosity index
D. Low flash point
A simple pitot tube measures the___________________?
A. Average velocity
B. Maximum velocity
C. Point velocity
D. Static pressure
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