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.Management Sciences
Category: Process Control and Instrumentation
The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by ____________________?
A. Reducing value of Kc
B. Introducing integral control
C. Introducing derivative control
D. None of the above
Which of the following is not a composition measuring instrument ?
A. Thermal conductivity cell
B. Mass spectrometer
C. Polarograph
D. Hot wire anemometer
A typical example of a physical system with under damped characteristic is a____________________?
A. U-tube manometer
B. Spring loaded diaphragm valve
C. CSTR with first order reaction
D. Thermocouple kept immersed in a liquid filled thermowell
Strain gage pressure transducers are used to measure _____________ pressures?
A. Gage as well as vacuum
B. Absolute as well as differential
C. Both A. and B.
D. Neither A. nor B.
Suppose that the gain, time constant and dead time of a process with the following transfer function: Gc(s) = 10 exp( – 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as________________?
A. 8, 0.6, 0.08
B. 12, 0.6, 0.12
C. 8, 0.6, 0.12
D. 12, 0.4, 0.08
The ______________ of a vapor pressure thermometer is a primary element?
A. Pointer
B. Bourdon tube
C. Bulb
D. None of these
Response of a system to a sinusoidal input is called _____________ response?
A. Impulse
B. Unit step
C. Frequency
D. None of these
Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an _____________ pyrometer?
A. Radiation
B. Optical
C. Photoelectric
D. None of these
Thermal conductivity measurement com-prises the working principle of a_________________?
A. CO2 analyser
B. Polarimeter
C. Spectrometer
D. Chromatograph
Continuous measurement of moisture in paper is done by_______________?
A. Sling psychrometer
B. Hair-hygrometer
C. Weighing
D. High resistance Wheatstone bridge circuit
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