This set of CIM Multiple Choice Questions & Answers (MCQs) focuses on “Basic Elements of Automated System”.
1. Which is not an element of an automated system?
a) Control system
b) Ignition system
c) Power
d) Program
View Answer
Explanation: An automated system has three key elements. They are power, a program of instructions, and a control system. Every system consists of these three elements in one form or another to carry out automation function.
2. The function of a _______ is to actuate the program instructions.
a) Electrical system
b) Power
c) Control system
d) Program
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Explanation: An automated system consists of a control system to actuate the instructions. Power is used to operate the system (actuators, digital computers, etc.) and program of instructions to direct the process.
3. Which of the following is a category of work cycle program?
a) Set-point control
b) Division-point control
c) Integrate-point control
d) Force-point control
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Explanation: Work cycle programs are set-point control, logic control, sequence control, interactive program, and intelligent program. In set-point control, the process parameter value is constant during the work cycle.
4. In which of the following work cycle program, the value of process parameter changes as a function of time?
a) Interactive program
b) Intelligent program
c) Logic control
d) Sequence control
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Explanation: In sequence control, the value of process parameter changes as a time function. Interaction occurs between a human operator and a control system in an interactive work cycle program.
5. A program to maintain furnace temperature at a particular value, comes under which category of work cycle program?
a) Set-point control
b) Logical control
c) Intelligent program
d) Sequence control
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Explanation: The set-point is the required value of the controlled variable (here temperature) in the process. In case of maintaining furnace temperature, programming involves setting temperature dial on the furnace.
6. Manufacturing operation performed on a work unit is known as _______ in production.
a) Handling
b) Process
c) Product
d) Finishing
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Explanation: In production, a process is a manufacturing operation performed on a work unit. Casting, forging, heat treatment, sheet metal punching, machining, welding, etc. are some examples of the process.
7. Power is used to perform which of the following functions for automation?
a) Actuating control signals
b) Loading and unloading work units
c) Material transport
d) Quality control
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Explanation: Power for automation is required for running controller unit, actuating control signals, and data acquisition and information processing. Industrial controllers require electric power to read the program, perform calculations and execute commands.
8. What is the primary source of power in an automated system?
a) Sunlight
b) Electricity
c) Atomic energy
d) Water
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Explanation: It is easy to convert electric power into alternate energy forms. It is used to transmit signals, information processing, data storage, communication, etc. Electricity is used to carry out manufacturing operations also.
9. What are the two types of control systems?
a) Closed and open loop
b) Feedback and closed loop
c) Serial and line loop
d) Fine and coarse loop
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Explanation: There are two types of control in an automated system – closed loop and open loop. In an open-loop control system, there is a risk that the actuator may not have the desired effect on the process.
10. Which is not a part of an open-loop control system?
a) Output variable
b) Input parameter
c) Feedback sensor
d) Process
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Explanation: There are five elements in an open-loop control system. These are – input parameter, process, controller, actuator, and output variable. A feedback sensor is an element of a closed-loop control system.
11. A closed-loop control system is also known as a feedback control system.
a) True
b) False
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Explanation: A closed-loop control system consists of feedback sensors and is also known as a feedback control system. In the closed-loop control system, the output variable is compared with the input parameter to drive the output in agreement with the input.
12. What are the advantages of an open-loop control system?
a) Less expensive
b) Complex structure
c) No need of calibration
d) Capacity of encountering large external disturbances
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Explanation: An open-loop control system consists of lesser components than a closed-loop control system. Thus, it is less expensive and simple in structure than a closed-loop control system. An open-loop control system needs a very reliable actuation.
13. Which of the following functions comes under advanced automation functions?
a) Welding
b) Material handling
c) Assembly
d) Error detection and recovery
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Explanation: Safety monitoring, maintenance & repair diagnostics, error detection & recovery are examples of advanced automation functions. The purpose of these functions is to enhance the safety and performance of equipment.
14. A system that protects the workers from hazardous work environment comes under which category of advanced automation functions?
a) Error detection and recovery
b) Assembly system
c) Safety monitoring
d) Maintenance and repair diagnostics
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Explanation: Safety monitoring in an automated system is carried out by the use of sensors. Sensors track the system’s operation and identify unsafe conditions. The purpose of the safety monitoring system is to ensure human safety and equipment safety.
15. Status monitoring is related to which of the following advanced automation functions?
a) Error detection
b) Safety monitoring
c) Error recovery
d) Maintenance and repair diagnostics
View Answer
Explanation: The diagnostics subsystem records and monitors the status of system sensors and the parameters in status monitoring mode. It displays these recorded values and current system status as and when requested.
Sanfoundry Global Education & Learning Series – CIM.
To practice all areas of CIM, here is complete set of Multiple Choice Questions and Answers.
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