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Automatic Control Systems

Automatic Control Systems
In the field controlled motor the entire damping comes from

Field resistance
Motor friction and load
Armature resistance
Back emf

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Automatic Control Systems
In control systems the output of sensor usually, is

Analog electrical signal
Digital electrical signal
Mechanical signal
Analog or digital electrical signal

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Automatic Control Systems
Transport lag usually exists in

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

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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
The sensor generally used in incremental optical encoder is

Photodiode
LCD
Either (a) or (b)
LED

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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

All
1 and 2
1, 2 and 3
3 and 4

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