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WorksheetsSample_ACD
Total questions: 30
Worksheet time: 15mins
1.What is a system in the context of automation?
A collection of random elements
A subset of interconnected elements
An indivisible unit
A set of independent processes
A controller for technological processes
2.Which energy type is NOT used in automation systems?
a) Electric
b) Pneumatic
c) Hydraulic
d) Magnetic
e) Direct Action
3.What type of signal represents discrete changes over time?
a) Analog signal
b) Discrete signal
c) Digital signal
d) Random signal
e) Stationary signal
4.Automatic Control Systems (ACS) are primarily used to:
a) Modify input parameters
b) Collect signals
c) Monitor the state of objects
d) Act on the controlled object
e) Predict output values
5.What distinguishes an Automatic Regulation System (ARS) from an Automated Control System (ACS)?
a) ACS has no feedback
b) ARS functions without human intervention
c) ARS only works in analog systems
d) ACS does not collect signals
e) ARS requires human input
6.Which component is NOT typically part of a basic automatic control system?
a) Tank
b) Sensor
c) Amplifier
d) Regulator
e) Disturbance
7.In an automatic control system for a tank, what is typically the input parameter?
a) Temperature
b) Pressure
c) Flow rate
d) Voltage
e) Sensor movement
8.Which factor can influence the dynamic characteristics of an automatic regulation system?
a) Feedback configuration
b) The color of the control device
c) The material of the sensor
d) The length of the pipeline
e) External temperature
9.What is the role of an amplifier in an Automatic Regulation System?
a) To detect disturbances
b) To magnify the signal
c) To regulate system accuracy
d) To act as the final control element
e) To compare input and output signals
10.The transient process in a dynamic system refers to:
a) Constant regulation
b) System behavior over time after a disturbance
c) Feedback control
d) The measurement of static characteristics
e) The behavior of the system at equilibrium
11.What is statism in an automatic regulation system?
a) A function of static signals
b) The difference between initial and final states
c) The coefficient determining the system's response to disturbances
d) The feedback loop that stabilizes the system
e) A method for monitoring analog signals
12.What happens in an unstable regulation system?
a) The system stabilizes quickly
b) Small disturbances lead to continuous oscillations
c) Feedback is disabled
d) A constant value is maintained
e) The system stops responding
13.A positive statism coefficient means
a) The controlled variable decreases as the disturbance increases
b) The system becomes unstable
c) The feedback loop is broken
d) The system requires manual intervention
e) There is no response to disturbances
14.Which of the following characteristics describes a dynamic regulation system?
a) It operates without external influences
b) It adjusts only during steady-state operation
c) It responds to changes in the controlled variable over time
d) It is insensitive to feedback configurations
e) It does not experience oscillations
15.Which of the following systems uses feedback for control?
a) Open-loop system
b) Analog signal system
c) Closed-loop system
d) Digital signal system
e) All of the above
16.Design an automatic regulation system (ARS) for controlling the temperature of a chemical reactor. The system should maintain the temperature at 80°C despite external disturbances, such as fluctuations in the inlet liquid's temperature. What key components would you use in this system, and how would they interact to maintain the set temperature?
a) Tank, sensor, secondary transducer, regulator
b) Sensor, actuator, comparison unit, heater
c) Amplifier, sensor, actuator, disturbance filter
d) Sensor, tank, controller, secondary measuring transducer
e) None of the above
17.In a DC motor used in a positioning system, you notice that the rotor's angular speed is oscillating around the desired position without stabilizing. What could be the primary reason for this behavior, and how would you modify the feedback system to resolve it?
a) Increase gain in the amplifier
b) Decrease the statism coefficient
c) Introduce negative feedback to reduce oscillations
d) Switch to a brushless motor for more stable control
e) Increase the input power to the motor
18.You are tasked with designing a relay-based control system to switch on a motor when the input current exceeds 5A. Given the mechanical nature of relays, what additional element should be included to protect the circuit from back e.m.f., and why?
a) Diode, to short the back e.m.f.
b) Amplifier, to increase the signal strength
c) Capacitor, to store excess energy
d) Inductor, to smooth out the current fluctuations
e) Resistor, to limit the current
19.Consider a system that uses a solenoid valve to control fluid flow in an automated process. Describe how you would modify the system to reduce the response time of the solenoid valve without compromising accuracy
a) Use a larger solenoid to increase magnetic field strength
b) Decrease the current through the solenoid
c) Use a faster amplifier to control the input current
d) Add a feedback loop to fine-tune the solenoid's response
e) Increase the resistance in the control circuit
20.A temperature control system has been exhibiting slow response times when adjusting to disturbances. To improve the response speed, you decide to redesign the system. What type of regulation (dynamic/static) would you target, and how would you configure the feedback?
a) Dynamic regulation with fast positive feedback
b) Dynamic regulation with carefully tuned negative feedback
c) Static regulation with high feedback gain
d) Static regulation with a low-gain feedback loop
e) Astatic regulation with no feedback loops
21.In a fuel level control system, the sensor responsible for measuring the level in the tank produces a noisy signal. What technique would you employ to ensure that the control system remains accurate and stable despite the noise?
a) Use a low-pass filter to eliminate high-frequency noise
b) Increase the sampling rate of the sensor
c) Implement a digital-to-analog converter
d) Reduce the gain in the sensor
e) Increase the power supply to the sensor
22.You are analyzing an electromechanical relay system where the armature is not closing as expected when the coil is energized. The current through the solenoid is adequate, but the relay fails intermittently. What could be a plausible explanation, and how would you solve it?
a) The relay is oversized; reduce its size
b) There is mechanical friction; lubricate the relay components
c) The coil voltage is too high; reduce it to safe levels
d) The relay’s contacts are dirty; clean or replace them
e) The feedback loop is broken; repair it
23.A brushed DC motor in an automation system requires frequent maintenance due to wear on the brushes and commutator. What is an alternative motor design that would reduce maintenance while maintaining similar performance?
a) Brushless DC motor
b) Stepper motor
c) Induction motor
d) Series-wound motor
e) Shunt-wound motor
24.In a static regulation system controlling pressure in a pipeline, you observe that as external disturbances increase, the controlled variable (pressure) consistently drops. How can you adjust the system to counteract the effect of disturbances?
a) Increase the statism coefficient
b) Decrease the feedback loop delay
c) Add a proportional-integral controlle
d) Switch to a static characteristic with no feedback
e) Increase system disturbance filtering
25.An electromechanical switch controls an industrial heating element. The system works well but often experiences surges when the element is turned on. How would you redesign the system to protect against these surges?
a) Introduce a solid-state relay to handle high-power transitions smoothly
b) Use a larger mechanical switch
c) Add a heat sink to the existing switch
d) Increase the system's voltage to compensate
e) Switch to a pneumatic control system
26.A pressure sensor is used in an industrial application, and its resistance is given by the equation R(T)=R0 (1+αT+βT2), where R0 =100Ω, α=0.00385°C−1, and β=0.0001°C−2. The temperature is to be measured from 0°C to 300°C. Calculate the sensor’s resistance at 100°C.
a) 110.50 Ω
b) 138.50 Ω
c) 140.00 Ω
d) 145.50 Ω
e) 150.83 Ω
27.A pressure sensor is used in an industrial application, and its resistance is given by the equation R(T)=R0 (1+αT+βT2), where R0 =100Ω, α=0.00385°C−1, and β=0.0001°C−2. The temperature is to be measured from 0°C to 300°C. Calculate the resistance at 300°C.
a) 165.00 Ω
b) 175.83 Ω
c) 178.00 Ω
d) 180.50 Ω
e) 190.00 Ω
28.A strain gauge has an initial resistance of 120Ω and a gauge factor of 2.2. The strain gauge is bonded to a steel bar experiencing a tensile strain of 5×10−3. Calculate the change in resistance ΔR for the strain gauge. What is the change in resistance ΔR?
a) 0.55 Ω
b) 0.88 Ω
c) 1.32 Ω
d) 1.5 Ω
e) 1.76 Ω
29.A thermistor with constants K=0.05Ω and β=3400K is used to measure temperatures ranging from -20°C to 150°C. a) Calculate the resistance of the thermistor at 0°C.О
a) 5.00 Ω
b) 5.50 Ω
c) 6.18 Ω
d) 6.50 Ω
e) 7.00 Ω
30.A thermistor with constants K=0.05Ω and β=3400K is used to measure temperatures ranging from -20°C to 150°C. b) Calculate the resistance of the thermistor at 100°C.
a) 0.55 Ω
b) 0.78 Ω
c) 0.92 Ω
d) 1.00 Ω
e) 1.20 Ω
