A cascade of three linear time invariant systems is causal and unstable. From this we conclude that at least one system is unstable and at least one system is causal. the majority are unstable and the majority are causal. each system in the cascade is individually caused and unstable. at least one system is causal and all systems are unstable. TRUE ANSWER : ? YOUR ANSWER : ?
A unity feedback control system has an open loop transfer function G(s) = k/(s(s² + 7s + 12) The gain k for which s = -1 + j1 will lie on the root locus of the system is 4 5 10 6.5 TRUE ANSWER : ? YOUR ANSWER : ?
The initial slope of Bode plot for a transfer function having no poles at the origin is -10dB/decade. 0 dB/decade -20dB/decade. +10dB/decade. TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following controller has sluggish response? derivative controller proportional controller both 2 and 3 integral controller TRUE ANSWER : ? YOUR ANSWER : ?
What is the open loop DC gain of a unity feedback control system having closed loop transfer function as 9/4 4/13 13/4 4/9 TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following transfer functions represent under damped second order systems? All of these 4/(s² + 2s + 4) 2/(s² + 2s + 2) 1/(s² + s + 1) TRUE ANSWER : ? YOUR ANSWER : ?
Electrical analogous quantity for dash-pot in force-current analogy is capacitance. inductance. resistance. conductance. TRUE ANSWER : ? YOUR ANSWER : ?
A function of one or more variables which conveys information about the nature of physical phenomenon is called noise. system. interference. signal. TRUE ANSWER : ? YOUR ANSWER : ?
The magnitude condition for root locus is .................. |G(s)H(s)| = ∞ |G(s)H(s)| = 0 |G(s)H(s)| = 2 |G(s)H(s)| = 1 TRUE ANSWER : ? YOUR ANSWER : ?
A second order system has peak over shoot = 50% and period of oscillations 0.2 seconds. Find the resonant frequency? 32.16 rad/s 29.74 ra/s 30.63 rad/s 31.41 rad/s TRUE ANSWER : ? YOUR ANSWER : ?