A. R + C
B. R – C
C. RC
D. 1/RC
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 - 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 - 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 - 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 - 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 - 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 photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in_______________?
A. Light intensity
B. Current
C. Flux density
D. Voltage - 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 - Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about ______________ micro mho/cm3?
A. 50
B. 100
C. 10
D. 1
