COMPUTERIZED NUMERICAL CONTROL (CNC)MACHINESMULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS
COMPUTERIZED NUMERICAL CONTROL
(CNC)MACHINES MULTIPLE CHOICE
QUESTIONS (MCQ) WITH ANSWERS
(a) Introduction Computerized Numerical
Control Machines
Computerized numerical control machines
are CNC Machines. MCQ on CNC machines
make understanding deep. These machines
are fully automated. These use computer to
generate computer commands in G and M codes.
These produce large quantity of produced
goods with high precision and quality standards.
There are 12 types of computerized numerical
control machines. Computerized numerical
control routers are used for cutting different
materials. These routers produce highly
decorated components. These use open and
close loop systems.
(b)Main parts of a computerized
numerical control machine
-
Central processing unit (CPU)
-
Input devices
-
Machine control unit (MCU)
-
Programmable logic computer (PLC)
-
Servo-control unit
-
Output unit
(c) Function & its utility
Each component carries out its function
speedily with high degree of accuracy.
Computerized numerical control machines
reduce rejections, reduces cost of
manufacture and improves look and
quality of the product. Today CNC
machines are used in all manufacturing
industries.
(d) MCQ
-
The CNC machine stands for
-
Firstly Computerized National Company
-
Secondly Computerized Numerical Company
-
Thirdly Computerized Numerical Control
-
None
ANS: (c)
-
CNC Machine started working in the year
-
1900
-
1940
-
1980
-
None
ANS: (c)
-
Computerized numerical control machines use
-
Digital data & a computer
-
A computer and a CAM program
-
A computer, a CAM program & a digital data
-
None
ANS: (c)
-
A CNC Machine uses
-
Open loop system
-
Closed loop system
-
Both (a) & (b)
-
None
ANS: (c)
-
Open loop system controls the
-
Input
-
Output
-
Both (a) & (b)
-
None
ANS: (a)
-
Closed loop system controls the
-
Input
-
Output
-
Both (a) & (b)
-
None
ANS: (b)
-
Open loop system is
-
Feedback system
-
Non feedback system
-
Both (a) & (b)
-
None
ANS: (b)
-
Closed loop system is
-
Feedback system
-
Non feedback system
-
Both (a) & (b)
-
None
ANS: (a)
-
An open loop system does
-
Correct machining
-
Incorrect machining
-
Both (a) & (b)
-
None
ANS: (b)
-
A closed loop system does
-
Correct machining
-
Incorrect machining
-
Both (a) & (b)
-
None
ANS: (a)
-
Computerized numerical control machines instructions are in
-
Part program commands
-
Full program commands
-
Both (a) & (b)
-
None
ANS: (a)
-
In a part program commands
-
One command is interpreted at a time & executed
-
Two commands are interpreted at a time and executed
-
Both (a) & (b)
-
None
ANS: (a)
-
In a CNC machine, a command
-
Starts with a numerical value and ends with a alphabet
-
Start with a numerical value and ends with two alphabets
-
Starts with a alphabet and ends with a numerical value
-
None
ANS: (c)
-
G-codes in computerized numerical control machines is a
-
Preparatory codes-instructions
-
Final codes-instructions
-
Both (a) & (b)
-
None
ANS: (a)
-
A CNC Machine controls the movements of the machine to
-
Automate
-
Monitor
-
Both (a) & (b)
-
None
ANS: (c)
-
Number of main components of a CNC machine is
-
5
-
7
-
9
-
None
ANS: (a)
-
The RS232 in a computerized numerical control machine is a
-
Serial port
-
Serial cable
-
Both (a) & (b)
-
None
ANS: (a)
-
The maximum length of a cable for a RS 232 serial port is
-
25 m
-
15 m
-
5 m
-
None
ANS: (b)
-
The Rs232 serial port is
-
Main working component
-
Used for trouble shooting
-
Used for improving the quality of the final product
-
None
ANS: (b)
-
The difference between RS232 and RS232c is
-
Former is a revised version
-
Later is a revised version
-
Both are same
-
None
ANS: (b)
-
The input devices of a computerized numerical control machines are
-
Amplifier circuit, Drive motors & Ball lead screws
-
Punch tape recorder, Magnetic tape recorder & Computer via RS232-C communication
-
Both (a) & (b)
-
None
ANS: (b)
-
The Machine Control Unit (MCU) is
-
Brain of the machine
-
Heart of the machine
-
Both (a) & (b)
-
None
ANS: (b)
-
The machine control unit (MCU) has
-
Data processing unit
-
Control loop unit
-
Both (a) & (b)
-
None
ANS: (c)
-
The MCU is a micro-computer and
-
Stores the program
-
Executes the commands into action using a machine tool
-
Both (a) & (b)
-
None
ANS: ©
-
A CNC machine tool is
-
Lathe/milling machine
-
MCU
-
Software & hardware
-
None
ANS: (a)
-
The CNC machine tool has
-
A sliding table and a spindle to control the speed and position
-
The machine is controlled in x and z direction and spindle is controlled in y direction
-
Both (a) & (b)
-
None
ANS: (d)
-
The CNC machine tool has
-
A sliding table and a spindle to control the speed and position
-
The machine is controlled in x and y direction and spindle is controlled in z direction
-
Both (a) & (b)
-
None
ANS: (c)
-
Types of CNC machines are
-
12
-
8
-
4
-
None
ANS: (a)
-
A larger industrial CNC machine has its computer
-
Inbuilt inside
-
Separate external
-
Both (a) & (b)
-
None
ANS: (a)
-
A hobbyist CNC machine has its computer
-
Inbuilt inside
-
Separate external
-
Both (a) & 9b)
-
None
ANS: (b)
-
The industrial CNC machine for monitoring and adjusting its cutter speed and position has a
-
Feedback system
-
No feedback system
-
Can’t say
-
None
ANS: (a)
-
NC (Numerical control)-code in a CNC machine is a
-
Simple computer language
-
Complex computer language
-
Complex ant computer language
-
None
ANS: (a)
-
The most common code of a CNC machine is
-
C-code
-
G-code
-
M-code
-
None
ANS: (b)
-
G-code activates
-
A CNC machine
-
Machine’s programmable logic computer
-
Both (a) & (b)
-
None
ANS: (a)
-
M-code activates
-
A CNC machine
-
Machine’s programmable logic computer
-
Both (a) & (b)
-
None
ANS: (b)
-
G-code in a CNC machines activates
-
Outside functions
-
Inside functions
-
Both inside and outside functions
-
None
ANS: (b)
-
M-code in a CNC machines activates
-
Outside functions
-
Inside functions
-
Both inside and outside functions
-
None
ANS: (a)
-
A CNC router in CNC machine handles
-
Cutting of multi-materials
-
Carving of multi-designs
-
Both (a) & (b)
-
None
ANS: (c)
-
CNC machines
-
Increases production
-
Improves quality
-
Both (a) & (b)
-
None
ANS: (c)
-
CNC machines are
-
Manual operated
-
Semi-automatic
-
Fully automatic
-
None
ANS: (c)
-
Initial cost of CNC machines vs conventional machines is
-
Less
-
Equal
-
More
-
None
ANS: (c)
-
Manufacturing cost per job using CNC machines vs conventional machines is
-
Less
-
Equal
-
More
-
None
ANS: (a)
-
The minimum number of axis of a CNC machine is
-
3
-
4
-
5
-
None
ANS: (a)
-
The maximum number of axis a CNC machine is
-
3
-
4
-
5
-
None
ANS: (c)
-
The x-axis of a CNC machine is
-
Horizontal
-
Inclined
-
Vertical
-
None
ANS: (c)
-
The y-axis of the CNC machine is
-
Horizontal
-
Inclined
-
Vertical
-
None
ANS: (a)
-
The z-axis of a CNC machine is
-
Width
-
Length
-
Depth
-
None
ANS: (c)
-
The fourth axis of a CNC machine refers to rotation about
-
x-axis
-
y-axis
-
z-axis
-
None
ANS: (a)
-
The fifth axis of a CNC machine refers to rotation about
-
x-axis
-
y-axis
-
z-axis
-
None
ANS: (b)
-
The sixth axis of a CNC machine refers to rotation about
-
x-axis
-
y-axis
-
z-axis
-
None
ANS: (c)
-
A 3-axis CNC machine is used for
-
Drilling holes & milling slots
-
Milling slots and cutting sharp edges
-
Both (a) & (b)
-
None
ANS: (c)
-
A 4 axis (A-axis) computerized numerical control machine is used for
-
Engraving curved surfaces
-
Intermittent and continuous cuttings
-
Both (a) & (b)
-
None
ANS: (c)
-
A 5-axis (B-axis) CNC machine is used for
-
Cutting intricate details & Machining complex shaped objects
-
Improved quality and increased production
-
Both (a) & (b)
-
None
ANS: (c)
-
A 6-axis (c-axis) CNC machine is used for
-
Cutting intricate details & Machining complex shaped objects
-
Improved quality and increased production
-
Both (a) & (b)
-
None
ANS: (c)
-
The motion of x-axis is
-
Up & down
-
Left to right
-
Front & back
-
None
ANS: (b)
-
The motion of y-axis is
-
Up & down
-
Left to right
-
Front & back
-
None
ANS: (c)
-
The motion of z-axis is
-
Up & down
-
Left to right
-
Front & back
-
None
ANS: (a)
-
The rotation of A-axis (4th axis) is
-
900Rotation about x-axis
-
1800 rotation about x-axis
-
3600 rotation about x-axis
-
None
ANS: (b)
-
The rotation of B-axis (5th axis) is
-
900Rotation about x-axis
-
1800 rotation about x-axis
-
3600 rotation about x-axis
-
None
ANS: (b)
-
The rotation of C-axis (6th axis) is
-
900Rotation about x-axis
-
1800 rotation about x-axis
-
3600 rotation about x-axis
-
None
ANS: (b)
-
Working of computerized numerical control machines need
-
Highly skilled operator
-
Skilled operator
-
Low skilled operator
-
None
ANS: (c)
-
Repairing of a CNC machine needs
-
Highly skilled technician
-
Skilled technician
-
Unskilled technician
-
None
ANS: (a)
-
Computerized numerical control machines use
-
CAD
-
CAM
-
Both (a) & (b)
-
None
ANS: (c)
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