Control Systems
Accurate and reliable output is possible with which of the following system?

 Open loop control system
None of these
 Closed loop control system
 Both 1 and 2

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Control Systems
A cascade of three linear time invariant systems is causal and unstable. From this we conclude that

 at least one system is causal and all systems are unstable.
 each system in the cascade is individually caused and unstable.
 at least one system is unstable and at least one system is causal.
 the majority are unstable and the majority are causal.

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Control Systems
In the integral control of the single area system frequency error is reduced to zero. Then

  integrator output and speed changer position attain a constant value.
 integrator o/p increases but speed changer position comes down.
 integrator o/p decreases and speed changer position comes down.
 integrator o/p decreases but speed changer position moves up.

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Control Systems
For a transfer function H (s) = P(s) / Q(s), where P (s) and Q (s) are polynomials in s. Then

  degree of P (s) is independent of degree of Q (s).
 maximum degree of P (s) and Q (s) differ at most by one.
 the degree of P (s) is always greater than the degree of Q (s).
 the degree of P (s) and Q (s) are same.

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