Question 571. 1.  Which of the following are correct? The feedback affects the control system in the following ways : 1. Increases accuracy but reduces sensitivity of gain to variation in system parameters. 2. Increases bandwidth and reduces the effect of non-linearity.3. Increases tendency towards oscillation or leads even to instability.Select the correct answer using the code given below :Codes :

Question 572. 9.  Consider the following statements for a single - phase hysteresis motor : 1. Torque is constant from standstill up to synchronous speed Ns.2. Rotor is provided with narrow slots embedded with bars.3. Torque at starting is somewhat more than that at synchronous speed Ns.4. As the name suggests, only hysteresis torque is produced from zero speed right up to Ns.5. Rotor material possesses very wide hysteresis loop.Which of tilt statements given above are correct?

Question 573. 0.  consider a system having forward path and feedback path transfer functions as 16/1s(s + 0.8)] and (1 + 2s) respectively. Which is the characteristic polynomial of the system?

Question 574. 2.  Given G(s)H(z) - so +1) (s+3) , the point of intersection of the asymptotes of the root loci with the real axis is

Question 575. 4.  For the polynomial P(s) = s5 + s4 + 2s3 + 2s2 + 3s + 15, the number of roots which lie in the right half of the s-plane is

Question 576. 7.  A ramp input applied to an unity feedback system results in 5% steady state error. The type number and zero frequency gain of the system are respectively

Question 577. 3.  The open-loop transfer function of a unity feedback system isG(s) -s(sh + s + 2) (s + 3) The range of K for which the system is stable is

Question 578. 8.  A double integrator plant, G(s)=,H(s) = 1 is to be compensated to achieve the damping ratio = 0.5, and an undamped natural frequency, con = 5 rad/s. Which one of the following compensator Ge(s) will be

Question 579. 6.  In the derivation of expression for peak percent overshoot, X 100%, which one of the following conditions is NOT required?

Question 580. 5.  Despite the presence of negative feedback, control systems still have problems of instability because the