1. In a control system the output of the controller is given to
a) Final control element
b) Amplifier
c) Comparator
d) Sensor
Explanation: In control system the output of the controller is given to the final control element it may be the plant or any other controller which-ever is used in the control circuit.
2. A controller, essentially, is a
a) Sensor
b) Clipper
c) Comparator
d) Amplifier
Explanation: A controller is essentially the comparator which compares the given input with the reference input and generates the error signal.
3. Which of the following is the input to a controller?
a) Servo signal
b) Desired variable value
c) Error signal
d) Sensed signal
Explanation: Error signal is the input to the controller and it causes the output to be the desired output.
4. The on-off controller is a _____ system.
a) Digital
b) Linear
c) Non-linear
d) Discontinuous
Explanation: The on-off controller is discontinuous at the point when the system changes its state from on to off.
5. The capacitance, in force-current analogy, is analogous to
a) Momentum
b) Velocity
c) Displacement
d) Mass
Explanation: The capacitance in the force current is analogous to the mass and this analogy is also called parallel analogy as mostly all the elements are parallel.
6. The temperature, under thermal and electrical system analogy, is considered analogous to
a) Voltage
b) Current
c) Capacitance
d) Charge
Explanation: The temperature under thermal and electrical system analogy is considered analogous to the voltage and is similar to the Force voltage analogy.
7. In electrical-pneumatic system analogy the current is considered analogous to
a) Velocity
b) Pressure
c) Air flow
d) Air flow rate
Explanation: In electrical-pneumatic system analogy the current is analogous to the air-flow rate.
8. The major components of a controller are:
a) Control element
b) Error detector and control element
c) Feedback element
d) Error detector and feedback element
Explanation: Controller is the extra block used in the system to get the desired characteristics and consists of two major components as the error detector and control element in the forward path.
9. Practically all the elements are:
a) Linear
b) Non-linear
c) Exponential
d) None of the mentioned
Explanation: It is not practically possible to achieve linear elements as there is some error present so practically all the elements present are non-linear but can be made linear only to some extent.
10. The need of assuming non-linear element as linear:
a) Simplicity of analysis and accuracy of results
b) Ease of calculations
c) Less time consuming
d) Mathematical tool available
Explanation: All the mathematical tools are available as per ideal cases so it is necessary to make assumptions for non-ideal to be nearly ideal and hence do the necessary calculations as needed.