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Automatic Control Systems

Automatic Control Systems
Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.

True
False

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Automatic Control Systems
Transport lag usually exists in

Thermal systems
Pneumatic systems
Hydraulic systems and thermal systems
Thermal, hydraulic and pneumatic systems

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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.

False
True

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Automatic Control Systems
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

Both A and B
None of these
The gain is increased beyond upper critical value
The gain is decreased below lower critical value

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Automatic Control Systems
Magnetic amplifier is used for

Power amplification
Frequency amplification
Current amplification
Voltage amplification

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Automatic Control Systems
The sensor generally used in incremental optical encoder is

LCD
Photodiode
LED
Either (a) or (b)

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