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Automatic Control Systems

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

Either (a) or (b)
LED
Photodiode
LCD

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

False
True

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

Impedance Z
Reactance X
Admittance Y
Conductance G

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Automatic Control Systems
Magnetic amplifier is used for

Current amplification
Frequency amplification
Power amplification
Voltage amplification

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Automatic Control Systems
The permanent magnet field system of brushless dc servo- motor is generally on

Either (a) or (b)
Rotor
Partly on stator and partly on rotor
Stator

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Automatic Control Systems
If the poles lie in second quadrant, damping ratio is

more than 1
less than 1
zero
1

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