Test: Automatic Control Systems - 8 - Electrical Engineering (EE) MCQ
25 Questions MCQ Test - Test: Automatic Control Systems - 8
Consider the following systems
System I, 
System II, 
where C(s) is the output and R(s) is the input of these systems
System I,
System II,
where C(s) is the output and R(s) is the input of these systems
Nyquist stability criterion is based on a theorem from the theory of complex variables.
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For the function G(s) H(s) = 
the phase cross-over frequency is
the phase cross-over frequency isAssertion (A): In liquid system the ratio of change in liquid level to change in flow rate is called resistance of liquid flow.
Reason (R): In liquid level systems the ratio of change in liquid stored in a tank to the change in head is called capacitance of tank.
While forming Routh's array, the situation of a row of zeros indicates that the system
The frequency at which phase angle is 180º is called
In a mechanical accelerometer, the steady state displacement is a measure of
A unity feedback system has 
. If input r(t) = 1 + 2t + 
t3, the steady error is
In log magnitude Bode diagram the slope of high frequency asymptote of (1 + jωT) is
Assertion (A): The root locus of a control system is symmetrical about real axis.
Reason (R): For all polynomials with real coefficients, complex poles always occur in conjugate pairs.
A compensator has its pole and zero as shown in the given figure
In a second order system, peak overshoot is independent of
For a stable system having two or more gain crossover frequencies the phase margin is measured
Nyquist plot provides information about absolute stability as well as relative stability.
Power handling capacity of wire wound potentiometer used in control systems is about
The Nyquist plot in the given figure is for G(s) H(s) = 
the logThe number of stator field windings in an ac tachometer are
In using Nyquist stability criterion it is not necessary to determine closed loop poles.
The polar plot of transport lag is a unit circle.
For the transport lag G(jω) = e-jωT, the polar plot is
The given figure shows a hybrid servosystem. The components 1, 2, 3, 4 are respectively
For the signal flow graph of the given figure consider the following statements
- It has three forward paths
- It has three individual loops
- It has two non touching loops
Out of above the correct statements are
Consider the following statements:
- The positiveness of coefficients of characteristic equation is necessary as well as sufficient condition for stability of first and second order systems.
- The positiveness of coefficients of characteristic equation ensures negativeness of real roots but is not sufficient condition for stability of third and higher order systems.
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