This set of Flexible Manufacturing System Multiple Choice Questions & Answers (MCQs) focuses on “DNC System”.
1. What is meant by DNC?
a) Device Numerical Control
b) Direct Numerical Control
c) Data Numerical Control
d) Direct Number Control
View Answer
Explanation: DNC means Direct Numeric Control. It is an advanced form of manufacturing technique with an ability to integrate factory. It is sometimes termed as Distributed Numeric Control.
2. Which of the following is not a component of DNC?
a) Gripper
b) Mainframe Computer
c) Bulk Memory
d) Telecommunication Line
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Explanation: Gripper is not a component of DNC. Mainframe Computer, Bulk Memory and Telecommunication Line are the components of Direct Numeric Control System.
3. Communications, Part program storage and ancillary functions are the three typical functions of DNC computer.
a) True
b) False
View Answer
Explanation: Communications, Part program storage and ancillary functions are the three typical functions served by the DNC computer. Each function is performed with the help of separate component of DNC.
4. Which stores the NC part programs?
a) Telecommunication Line
b) Machine Tool
c) Mainframe Computer
d) Bulk Memory
View Answer
Explanation: Bulk Memory stores the NC part Programs. The instructions to machine part are sent through Part programs in the form of G-Codes and M-Codes. The system understands the part programs and machines accordingly.
5. Which unit of CNC machine tool is under direct communication with the DNC computer?
a) Operation Unit
b) Testing Unit
c) Machine Control Unit
d) Processing Unit
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Explanation: Machine Control Unit of each Computer Numeric Control machine tool will be under direct communication with Direct Numeric Control Computer. Individual machine tool of CNC is controlled by its Machine Control Unit.
6. Which of the following can be defined as a manufacturing system in which a number of machines are controlled by a computer through direct connection in real time?
a) DMD
b) DNC
c) VMC
d) CFC
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Explanation: DNC or Direct Numerical Control is a manufacturing system in which a number of machines are controlled by a computer through direct connection in real time. It has large storage capacity thereby storing large size part programs.
7. Which will convert the instruction into particular coding system as per the particular machine tool?
a) Post Processor
b) Pre Processor
c) Assembler
d) Adaptor
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Explanation: In order to convert the instruction into particular coding system as per the particular machine tool, post processors are used. It is an important component of the entire Direct Numerical Control System.
8. Which component of DNC system are usually cables which connect the machine tool with central computer?
a) Machine Tool
b) Mainframe Computer
c) Bulk Memory
d) Telecommunication Line
View Answer
Explanation: The component of DNC which enables the communication between the central computer and all the machine tool is the Telecommunication Line. They are usually cables that connect the machine tool with the central computer.
9. Drip Feeding is done in case of large size part programs.
a) False
b) True
View Answer
Explanation: Drip Feeding is usually done when the size of part programs are huge. They may be held in large disk space of DNC system and sent in small chunks depending upon the availability of memory in the machine control unit.
10. Which component of DNC system contains NC milling, lathes and machining centers?
a) Telecommunication Line
b) Mainframe Computers
c) Machine Tools
d) Bulk Memory
View Answer
Explanation: The component of DNC which contains NC Milling, lathes and machining centers is Machine Tool. Telecommunication Line, Mainframe computers and Bulk Memory are the other components of DNC system and do not contain machining centers.
11. How is Simulation model classified?
a) Probable and Improbable
b) Continuous and Discrete
c) Standalone and Functional
d) Stable and Unstable
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Explanation: Simulation Model can be either continuous or discrete. A computerized model of FMS is parameterized on the simulation computer. It is allowed to run for a certain time in order to determine the performance of FMS.
12. What is the process of sending part programs to the CNC machine tool unit?
a) Part Program Derailing
b) Part Program Downloading
c) Part Program Uploading
d) Part Program Loading
View Answer
Explanation: The process of sending part programs to the CNC machine tool unit is known as Part Program Downloading. This is done in a sequential manner as and when required by the CNC machine tool unit.
13. What is meant by DPU?
a) Data Processing Unit
b) Driver Packed Unit
c) Data Packed Unit
d) Driver Processing Unit
View Answer
Explanation: DPU literally means Data Processing Unit. It contains DPU software and Control System Software. Its main function is to perform calculation and interpolation of algorithm to achieve smooth cutting action.
14. What is meant by CLU?
a) Control Logical Unit
b) Control Loops Unit
c) Central Logical Unit
d) Central Loops Unit
View Answer
Explanation: CLU means Control Loops Unit. It is one of the two main units of Machine Control Unit. It sends signals and receives feedbacks from the system. Control Logical Unit, Central Logical Unit and Central Loops Unit are not the literal abbreviations of CLU in DNC system.
15. Which of the following processes the data from the part program and provides it to CLU?
a) DPU
b) CPU
c) UPV
d) UDP
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Explanation: The data from the part program is processed and provided to the Control Loops Unit by DPU. This enables the drives attached to the system to process according to the set of instructions given by the part program.
16. What is the process of receiving the part programs from the CNC machine tool unit?
a) Part Program Uploading
b) Part Program Downloading
c) Part Program Loading
d) Part Program Derailing
View Answer
Explanation: The process of receiving the part programs from the CNC machine tool unit after it has been edited or prepared on the machine control unit is known as Part Program Uploading. Changes if required are made to part programs and sent for downloading process.
Sanfoundry Global Education & Learning Series – Flexible Manufacturing System.
To practice all areas of Flexible Manufacturing System, here is complete set of 1000+ Multiple Choice Questions and Answers.
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