The transfer function for a P-D controller is________________?
The transfer function for a P-D controller is________________?
A. Kc(1+ηD s)
B. Kc(1 +1/ηD s)
C. Kc ηD s
D. Kc/ηD s
Process Control and Instrumentation
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Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as________________?
Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as________________?A. Q0(T0 – T) = Ac . h (dT/dt)
B. Q0T0 – QT = Ac . h (dT/dt)
C. Q(T0 – T) = Ac . h (dT/dt)
D. Q(T0 – T) = Ac . (dTH/dt) -
The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/[2 (2s + 1) (3s + 1)] will have a definite number of loci for variation of K from 0 to ∞. The number of loci is_______________?
The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/[2 (2s + 1) (3s + 1)] will have a definite number of loci for variation of K from 0 to ∞. The number of loci is_______________?A. 1
B. 2
C. 3
D. 4 -
Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability ?
Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability ?A. Mercury in glass thermometer
B. Alcohol in glass thermometer
C. Fused metal (Na or K) in steel thermometer
D. Nitrogen in steel thermometer -
Working principle of mercury in glass thermometer is__________________?
Working principle of mercury in glass thermometer is__________________?A. Volumetric expansion
B. Pressure rise with temperature
C. Linear expansion
D. None of these -
In a closed loop system, the process to be controlled is an integrating process with transfer function 1/2s. The controller proposed to be used in an integral controller with transfer function 1/T1s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit__________________?
In a closed loop system, the process to be controlled is an integrating process with transfer function 1/2s. The controller proposed to be used in an integral controller with transfer function 1/T1s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit__________________?A. Overdamped response
B. Underdamped response
C. Undamped response
D. Unstable response -
A typical example of a physical system with under damped characteristic is a____________________?
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 -
“A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency.” This is _______________ criterion?
“A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency.” This is _______________ criterion?A. Bode stability
B. Nyquist
C. Routh stability
D. None of these -
In a second order under damped system, the_________________?
In a second order under damped system, the_________________?A. Time required for the response of first reach its ultimate value is called the response time
B. Overshoot (which is a measure of how much the response exceeds the ultimate value) increase
with the decrease of damg co-efficient
C. Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of
overshoot
D. None of these -
Which of the following cannot measure a temperature of 1600°C ?
Which of the following cannot measure a temperature of 1600°C ?A. Platinum resistance thermometer
B. Thermocouple
C. Photo-electric pyrometer
D. Radiation pyrometer