• Home »
  • CNC Machines »
  • COMPUTERIZED NUMERICAL CONTROL (CNC)MACHINESMULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS

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 

  1. Central processing unit (CPU)

  2. Input devices

  3. Machine control unit (MCU)

  4. Programmable logic computer (PLC)

  5. Servo-control unit

  6. 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

  1. The CNC machine stands for

  1. Firstly  Computerized National Company

  2. Secondly  Computerized Numerical Company

  3. Thirdly    Computerized Numerical Control

  4. None

ANS: (c)

  1. CNC Machine started working in the year

  1. 1900

  2. 1940

  3. 1980

  4. None

ANS: (c)

  1.  Computerized numerical control machines use

  1. Digital data & a computer

  2. A computer and a CAM program

  3. A computer, a CAM program & a digital data

  4. None

ANS: (c)

  1. A CNC Machine uses

  1. Open loop system

  2. Closed loop system

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. Open loop system controls the

  1. Input

  2. Output

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. Closed loop system controls the

  1. Input

  2. Output

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. Open loop system is

  1. Feedback system

  2. Non feedback system

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. Closed loop system is

  1. Feedback system

  2. Non feedback system

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. An open loop system does

  1. Correct machining

  2. Incorrect machining

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. A closed loop system does

  1. Correct machining

  2. Incorrect machining

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. Computerized numerical control machines instructions are in

  1. Part program commands

  2. Full program commands

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. In a part program commands

  1. One command is interpreted at a time & executed

  2. Two commands are interpreted at a time and executed

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. In a CNC machine, a command

  1. Starts with a numerical value and ends with a alphabet

  2. Start with a numerical value and ends with two alphabets

  3. Starts with a alphabet and ends with a numerical value

  4. None

ANS: (c)

  1. G-codes in computerized numerical control machines is a

  1. Preparatory codes-instructions

  2. Final codes-instructions

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. A CNC Machine controls the movements of the machine to

  1. Automate

  2. Monitor

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. Number of main components of a CNC machine is

  1. 5

  2. 7

  3. 9

  4. None

ANS: (a)

  1. The RS232 in a computerized numerical control machine is a

  1. Serial port

  2. Serial cable

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. The maximum length of a cable for a RS 232 serial port is

  1. 25 m

  2. 15 m

  3. 5 m

  4. None

ANS: (b)

  1. The Rs232 serial port is

  1. Main working component

  2. Used for trouble shooting

  3. Used for improving the quality of the final product

  4. None

ANS: (b)

  1. The difference between RS232 and RS232c is

  1. Former is a revised version

  2. Later is a revised version

  3. Both are same

  4. None

ANS: (b)

  1. The input devices of a computerized numerical control machines are

  1. Amplifier circuit, Drive motors & Ball lead screws

  2. Punch tape recorder, Magnetic tape recorder & Computer via RS232-C communication

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. The Machine Control Unit (MCU) is

  1. Brain of the machine

  2. Heart of the machine

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. The machine control unit (MCU) has

  1. Data processing unit

  2. Control loop unit

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. The MCU is a micro-computer and

  1. Stores the program

  2. Executes the commands into action using a machine tool

  3. Both (a) & (b)

  4. None

ANS: ©

  1. A CNC machine tool is

  1. Lathe/milling machine

  2. MCU

  3. Software & hardware

  4. None

ANS: (a)

  1. The CNC machine tool has

  1. A sliding table and a spindle to control the speed and position

  2. The machine is controlled in x and z direction and spindle is controlled in y direction

  3. Both (a) & (b)

  4. None

ANS: (d)

  1. The CNC machine tool has

  1. A sliding table and a spindle to control the speed and position

  2. The machine is controlled in x and y direction and spindle is controlled in z direction

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. Types of CNC machines are

  1. 12

  2. 8

  3. 4

  4. None

ANS: (a)

  1. A larger industrial CNC machine has its computer

  1. Inbuilt inside

  2. Separate external

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. A hobbyist CNC machine has its computer

  1. Inbuilt inside

  2. Separate external

  3. Both (a) & 9b)

  4. None

ANS: (b)

  1. The industrial CNC machine for monitoring and adjusting its cutter speed and position has a

  1. Feedback system

  2. No feedback system

  3. Can’t say

  4. None

ANS: (a)

  1. NC (Numerical control)-code in a CNC machine is a

  1. Simple computer language

  2. Complex computer language

  3. Complex ant computer language

  4. None

ANS: (a)

  1. The most common code of a CNC machine is

  1. C-code

  2. G-code

  3. M-code

  4. None

ANS: (b)

  1. G-code activates

  1. A CNC machine

  2. Machine’s programmable logic computer

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. M-code activates

  1. A CNC machine

  2. Machine’s programmable logic computer

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. G-code in a CNC machines activates

  1. Outside functions

  2. Inside functions

  3. Both inside and outside functions

  4. None

ANS: (b)

  1. M-code in a CNC machines activates

  1. Outside functions

  2. Inside functions

  3. Both inside and outside functions

  4. None

ANS: (a)

  1. A CNC router in CNC machine handles

  1. Cutting of multi-materials

  2. Carving of multi-designs

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. CNC machines

  1. Increases production

  2. Improves quality

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. CNC machines are

  1. Manual operated

  2. Semi-automatic

  3. Fully automatic

  4. None

ANS: (c)

  1. Initial cost of CNC machines vs conventional machines is

  1. Less

  2. Equal

  3. More

  4. None

ANS: (c)

  1. Manufacturing cost per job using CNC machines vs conventional machines is

  1. Less

  2. Equal

  3. More

  4. None

ANS: (a)

  1. The minimum number of axis of a CNC machine is

  1. 3

  2. 4

  3. 5

  4. None

ANS: (a)

  1. The maximum number of axis a CNC machine is

  1. 3

  2. 4

  3. 5

  4. None

ANS: (c)

  1. The x-axis of a CNC machine is

  1. Horizontal

  2. Inclined

  3. Vertical

  4. None

ANS: (c)

  1. The y-axis of the CNC machine is

  1. Horizontal

  2. Inclined

  3. Vertical

  4. None

ANS: (a)

  1. The z-axis of a CNC machine is

  1. Width

  2. Length

  3. Depth

  4. None

ANS: (c)

  1. The fourth axis of a CNC machine refers to rotation about

  1. x-axis

  2. y-axis

  3. z-axis

  4. None

ANS: (a)

  1. The fifth axis of a CNC machine refers to rotation about

  1. x-axis

  2. y-axis

  3. z-axis

  4. None

ANS: (b)

  1. The sixth axis of a CNC machine refers to rotation about

  1. x-axis

  2. y-axis

  3. z-axis

  4. None

ANS: (c)

  1. A 3-axis CNC machine is used for

  1. Drilling holes & milling slots

  2. Milling slots and cutting sharp edges

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. A 4 axis (A-axis) computerized numerical control  machine is used for

  1. Engraving curved surfaces

  2. Intermittent and continuous cuttings

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. A 5-axis (B-axis) CNC machine is used for

  1. Cutting intricate details & Machining complex shaped objects

  1. Improved quality and increased production

  2. Both (a) & (b)

  3. None

ANS: (c)

  1. A 6-axis (c-axis) CNC machine is used for

  1. Cutting intricate details & Machining complex shaped objects

  1. Improved quality and increased production

  2. Both (a) & (b)

  3. None

ANS: (c)

  1. The motion of x-axis is

  1. Up & down

  2. Left to right

  3. Front & back

  4. None

ANS: (b)

  1. The motion of y-axis is

  1. Up & down

  2. Left to right

  3. Front & back

  4. None

ANS: (c)

  1. The motion of z-axis is

  1. Up & down

  2. Left to right

  3. Front & back

  4. None

ANS: (a)

  1. The rotation of A-axis (4th axis) is

  1. 900Rotation about x-axis

  2. 1800 rotation about x-axis

  3. 3600 rotation about x-axis

  4. None

ANS: (b)

  1. The rotation of B-axis (5th axis) is

  1. 900Rotation about x-axis

  2. 1800 rotation about x-axis

  3. 3600 rotation about x-axis

  4. None

ANS: (b)

  1. The rotation of C-axis (6th axis) is

  1. 900Rotation about x-axis

  2. 1800 rotation about x-axis

  3. 3600 rotation about x-axis

  4. None

ANS: (b)

  1. Working of computerized numerical control  machines need

  1. Highly skilled operator

  2. Skilled operator

  3. Low skilled operator

  4. None

ANS: (c)

  1. Repairing of a CNC machine needs

  1. Highly skilled technician

  2. Skilled technician

  3. Unskilled technician

  4. None

ANS: (a)

  1. Computerized numerical control machines use

  1. CAD

  2. CAM

  3. Both (a) & (b)

  4. None

ANS: (c)

https://www.mesubjects.net/wp-admin/post.php?post=3952&action=edit         manufacturing methods

https://mesubjects.net/wp-admin/post.php?post=14451&action=edit       MCQ DEGREES OF FREEDOM