Control System MCQs

For a two-phase servo motor which one of the following statements is not true?

Which one of the following transducers is used to obtain the output position in a position control system?

Consider the following statements regarding the number of sign changes in the first column of the Routh table in respect of the characteristic equation s2 + 2as + 4. TE a = + E, where E = near zero, the number of sign changes will be equal to zero. 2. If-a = 0, the number of sign changes will be equal to I. 3. If a = 1 E, where E = near zero, the number of sign changes will be equal to 2 Of these statements

Consider the following expressions which indicate the step or impulse response of an intially relaxed control system : 1. (5 ? 4e-2t) u (t) 2. (e-2t + 5) u (t) 3. 8(t) + 8e-2t u (t) 4. 8(t) + 4e-2t u(t) Those which correspond to the step and impulse response of the same system include

The constant M-circles corresponding to the magnitude (M) of the closed loop transfer function of a linear system of values of M greater than one lie in the G-plane and to the

The characteristics equation of a closed-loop control system is given as s2 + 4s + 16 = 0. The resonant frequency in radians/sec. of the system is

The open loop transfer function of a control system is given by K(s + 10) s(s + 2)(s + a) The smallest possible value of 'a' for which this system is stable in the closed-loop for all positive values of K is

A phase-lag compensation will

Consider the following statements regarding a first order system with a proportional (P) controller which exhibits an offset to a step input: 1. increase the gain of the P controller 2. add derivative mode 3. add integral mode Of these statements