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.Management Sciences
Category: Process Control and Instrumentation
Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are________________?
A. Air to open valve with the controller direct acting
B. Air to close valve with the controller indirect acting
C. Air to open valve with the controller indirect acting
D. Air to close valve with the controller direct acting
Which of the following thermometers is not suitable for distant reading upto 60 metres ?
A. Vapor pressure thermometer
B. Mercury in glass thermometer
C. Constant volume gas thermometer
D. Resistance thermometer
Platinum resistance thermometer is the international standard for temperature measurement between __________________?
A. Triple point of hydrogen and freezing point of antimony
B. 13.81°K to 903.9°K
C. Both A. and B.
D. Neither A. nor B.
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if________________?
A. Kc is reduced
B. Kc is increased
C. Integral control action is introduced
D. Derivative control action is introduced
Which thermocouple can be used to measure a temperature of around 1400°C ?
A. Copper-constantan
B. Aluminium-Chromel
C. Platinum-platinum + rhodium
D. None of these
Typical specifications for design stipulates the gain margin and phase margin to be respectively__________________?
A. > 1.7 and > 30°
B. 30°
C. < 1.7 and 1.7 and < 30°
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in ____________ in the electrical resistance of the wire ?
A. No change
B. Decrease
C. Increase
D. Exponential decrease
Bode diagram are generated from output response of the system subjected to which of the following input ?
A. Impulse
B. Step
C. Ramp
D. Sinusoidal
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