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Automatic Control Systems

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

LED
Photodiode
Either (a) or (b)
LCD

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

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

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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
All
3 and 4
1, 2 and 3

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Automatic Control Systems
Nyquist stability criterion uses open loop frequency response characteristics.

True
False

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Automatic Control Systems
Nichol’s chart is symmetric about – 180° axis.

True
False

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Automatic Control Systems
Which of the following is open loop system?

Wind screen wiper
Respiratory system of animal
System for controlling antirocket missiles
Aqualing

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