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Automatic Control Systems
In control systems the output of sensor usually, is
Analog or digital electrical signal
Mechanical signal
Analog electrical signal
Digital electrical signal
Analog or digital electrical signal
Mechanical signal
Analog electrical signal
Digital electrical signal
Answer
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Automatic Control Systems
For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency.
True
False
True
False
Answer
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Automatic Control Systems
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°
The frequency at intersection of G(j?) locus and M = +3 dB locus gives bandwidth of closed loop system
M loci are centred about (0 dB, -180°) point
(0 dB, -180°) point on Nichols chart represent critical Point (-1, 0)
It is symmetric about -180°
The frequency at intersection of G(j?) locus and M = +3 dB locus gives bandwidth of closed loop system
M loci are centred about (0 dB, -180°) point
Answer
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Automatic Control Systems
If the poles lie in second quadrant, damping ratio is
1
zero
less than 1
more than 1
1
zero
less than 1
more than 1
Answer
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Automatic Control Systems
Which of the following can be used as a rotating amplifier in a control system? 1. Amplidyne 2. Separately excited dc generator 3. Synchro 4. Self excited dc generator
1 and 2
3 and 4
1, 2 and 3
All
1 and 2
3 and 4
1, 2 and 3
All
Answer
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Automatic Control Systems
The sensor generally used in incremental optical encoder is
Photodiode
LED
LCD
Either (a) or (b)
Photodiode
LED
LCD
Either (a) or (b)
Answer
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