A. Time taken by the controlled variable to reach 63.2% of its full change
B. Same as transportation lag
C. Same as dead time
D. Time required by the measured variable to reach 63.2% of its ultimate change
Related Mcqs:
- 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 - Nitrogen gas constant volume thermometer is suitable for measuring a temperature of _____________ °C?
A. 0-100
B. < 0
C. > 100
D. > 50 - A constant volume gas thermometer employing ______________ is used to measure sub-zero (i.e., < 0°C) temperature?
A. Helium
B. Hydrogen
C. Nitrogen
D. None of these - Helium gas constant volume thermometer is suitable for the measurement of a temperature of ______________ °C?
A. < 100
B. < 0
C. > 0
D. > 800 - The unit of ‘time constant’ of a system is the same as that of___________________?
A. Velocity
B. Time
C. (Time)-1
D. None of these - Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant) ?
A. V/nRT
B. nRT/V
C. nRT/P
D. P/nRT - Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing ?
A. Helium
B. Nitrogen
C. Hydrogen
D. None of these - A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is______________?
A. 45°
B. -90°
C. -180°
D. -45° - 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______________?
A. 1
B. 0.5
C. 1/√2
D. 0.25 - The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is________________?
A. 5π/12
B. π/6
C. π/12
D. π/3
