Automatic Control Systems - ECE Questions and Answers

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In force current analogue, mechanical mobility is analogous to

impedance Z

admittance Y

reactance X

conductance G

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If any term in the first column of a Routh array becomes zero, then

Routh criterion cannot be used to determine stability

Routh criterion can be used by substituting a small positive number for zero and completing the array

Routh criterion can be used by substituting a big positive number for zero and completing the array

Routh criterion can be used by substituting a small negative number for zero and completing the array

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Which of the following features is not associated with Nichols chart?

(0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)

It is symmetric about -180°

M loci are centred about (0 dB, -180°) point

The frequency at intersection of G(jω) locus and M = +3 dB locus gives bandwidth of closed loop system

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The polar plot of

does not cross real axis

crosses real axis once

crosses real axis 2 times

crosses real axis 4 times

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Which of the following can be used as a rotating amplifier in a control system?

Amplidyne
Separately excited dc generator
Synchro
Self excited dc generator

Select the answer from the following codes:

3 and 4

1 and 2

1, 2 and 3

all

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A lead compensator

speeds up the transient response

increases the stability margin

increases the stability margin and speeds up the transient-response.

none of the above.