Control Systems

1. Which of the following can be measured by LVDT?

1. Displacement
2. Velocity
3. Acceleration
4. Any of the above

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2. A car is raining at a constant speed of 50 km/h, which of the following is the feedback element for the driver?

1. Clutch
2. Eyes
3. Needle of the speedometer
4. Steering wheel

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3. A closed loop system is distinguished from open loop system by which of the following?

1. Servomechanism
2. Feedback
3. Output pattern
4. Input pattern

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4. A conditionally stable system exhibits poor stability at

1. low frequencies
2. reduced values of open loop gain
3. increased values of open loop gain
4. none of the above

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5. A control system in which the control action is somehow dependent on the output is known as

1. Closed loop system
2. Semiclosed loop system
3. Open system
4. None of the above

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6. A control system with excessive noise, is likely to suffer from

1. saturation in amplifying stages
2. loss of gain
3. vibrations
4. oscillations

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7. A control system working under unknown random actions is called

1. computer control system
2. digital data system
3. stochastic control system
4. adaptive control system

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8. A controller, essentially, is a

1. sensor
2. clipper
3. comparator
4. amplifier

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9. A differentiator is usually not a part of a control system because it

1. reduces damping
2. reduces the gain margin
3. increases input noise
4. increases error

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10. A good control system has all the following features except

1. good stability
2. slow response
3. good accuracy
4. sufficient power handling capacity

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