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# Control System Questions

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Which among the following is not an advantage of an open loop system?

ASimplicity in construction & design

B

C

DRequirement of system recalibration from time to time

Explanation:

Advantages of open loop control system: 1. Simplicity and stability: they are simpler in their layout and hence are economical and stable too due to their simplicity. 2. Construction: Since these are having a simple layout so are easier to construct.

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The closed system has higher ________ than open loop control system, this implies increased speed of response.

AGain

BBandwidth

CFrequency

DSpeed

Explanation:

As transient response of the system is improved by the use of feedback and it causes the settling time to reduce and closed loop system has higher bandwidth than open loop systems and this implies increase in speed of response.

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In signal flow graph, the product of all ______gains while going through a forward path is known as

ABranch

BPath

CNode

D

Explanation:

Path gain is the product of the gains of all the branches in the path.

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Find RAB

A1 ?

B1/3 ?

C2/3 ?

D2 ?

Explanation:

Rearranging the circuit we get: The equivalent resistance will be 2ohm.

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A square in which each (i,

AHermitian matrix

BSkew symmetric matrix

CConjugate anti-symmetric matrix

DSkew-Hermitian matrix

Explanation:

This matrix is called skew hermitian matrix. A square matrix, A , is skew-Hermitian if it is equal to the negation of its complex conjugate transpose, A = -A' .Below is an example of Skew Hermitian Matrix.

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The frequency at which the phase of the system acquires ____ is known as

A

B

C

D

Explanation:

The phase crossover frequency is the frequency at which the phase angle first reaches ?180°.
This is the factor by which the gain must be multiplied at the phase crossover to have the value 1.

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For a series resonant circuit at low frequency circuit impedance is __________ and at high frequency circuit impedance is __________

Acapacitive,inductive

Binductive,capacitive

Cresistive,inductive

Dcapacitive,resistive

Explanation:

From seeing the graph we can see that at low frequency (?0 )the impedance is inductive

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