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Automatic Control Systems

Automatic Control Systems
In force current analogue, mechanical mobility is analogous to

Admittance Y
Reactance X
Conductance G
Impedance Z

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Automatic Control Systems
A system is highly oscillatory if

Gain margin is high and phase margin is 180°
Gain margin is high
Gain margin is close to 1
Gain margin is close to 1 or phase margin is zero

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Automatic Control Systems
Transport lag usually exists in

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

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Automatic Control Systems
Which control action can never be used alone?

Derivative
Both (b) and (c)
Integral
Proportional

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Automatic Control Systems
In Bode plots the frequency at which two asymptotes meet is called corner frequency.

True
False

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Automatic Control Systems
In a simple on-off controller with differential gap, the magnitude of differential gap determines

Both (a) and (b)
Neither (a) nor (b)
The level of accuracy
The life of controller

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