Automatic Control Systems - ECE Questions and Answers

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For the transfer function , the polar plot a is

semi circle

circle

spiral

none of the above

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A proportional controller is basically

an amplifier with adjustable gain

an integrating amplifier

an amplifier with infinite gain

an amplifier with almost zero gain

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A network has . Then

it is lead network

it is lag network

it is lead network if T₁ > T₂ and lag network T₁ < T₂

it is lead network if T₁ < T₂ and lag network T₁ > T₂

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The given figure shows log magnitude versus ω plots of a system for different values of gain. For this system

curve 1 shows highest gain margin and curve 2 shows poorest gain margin

gain margins shown by the three curves are equal

curve 1 shows poorest gain margin and curve 3 shows highest gain margin

curve 3 shows poorest gain margin while curve 1 shows highest gain margin

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The purpose of series quadrature windings in amplidyne is to

neutralize the effect of armature reaction

reduce commutation difficulties

increase the gain

increase response time

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For the transport lag G(jω) = e^-jωT, the phase angle

is constant

varies linearly with frequency

varies linearly with low frequencies only

values as per square law

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In classical analogue, torque is analogous to

current

voltage

charge

voltage gradient

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The pole zero plot of the given figure is for

non-minimum phase function

minimum phase function

all pass function

either (b) or (c)

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For the function G(s) = the poles are at

s = 0 and s = ∞

s = j2np where n = 0, 1, 2

s = ± j2np where n = 0, 1, 2..

none of the above.