Deck 4: Computer-Aided Design (CAD)

Question 1

CAD/CAM is the relationship between

A)science and engineering
B)manufacturing and marketing
C)design and manufacturing
D)design and marketing

Answer 1

design and manufacturing

Question 2

Which two disciplines are tied by a common database?

A)documentation and geometric modeling
B)CAD and CAM
C)drafting and documentation
D)none of the mentioned

Answer 2

CAD and CAM

Question 3

The term that is used for geometric modelling like solid modelling, wire frame modelling and drafting is known as

A)software package
B)operating system
C)application software
D)none of the mentioned

Answer 3

software package

Question 4

The software that is used to control the computer's work flow, organize its data and perform housekeeping functions is known as

A)operating software
B)graphics software
C)application software
D)programming software

Question 5

During the execution of a CNC part program block NO20 GO2 X45.0 Y25.0 R5.0 the type of tool motion will be

A)circular Interpolation - clockwise
B)circular Interpolation - counter clockwise
C)linear Interpolation
D)rapid feed

Question 6

In an NC machining operation, the tool has to be moved from point (5, 4) to point (7, 2) along a circular path with centre at (5, 2). Before starting the operation, the tool is at (5, 4). The G and N codes for this motion are

A)N010 GO3 X7.0 Y2.0 I5.0 J2.0
B)N010 GO2 X7.0 Y2.0 I5.0 J2.0
C)N010 GO1 X7.0 Y2.0 I5.0 J2.0
D)N010 GOO X7.0 Y2.0 I5.0 J2.0

Question 7

The tool of an NC machine has to move along a circular arc from (5, 5) to (10, 10) while performing an operation. The centre of the arc is at (10, 5). Which one of the following NC tool path command performs the above mentioned operation?

A)N010 GO2 X10 Y10 X5 Y5 R5
B)N010 GO3 X10 Y10 X5 Y5 R5
C)N010 GO1 X5 Y5 X10 Y10 R5
D)N010 GO2 X5 Y5 X10 Y10 R5

Question 8

Match the following: NC code Definition P. M05 1. Absolute coordinate system Q. G01 2. Dwell R. G04 3. Spindle stop S. G09 4. Linear interpolation

A)P-2, Q-3, R-4, S-1
B)P-3, Q-4, R-1, S-2
C)P-3, Q-4, R-2, S-1
D)P-4, Q-3, R-2, S-1

Question 9

In a CNC program block, N02 GO2 G91 X40 Z40……, GO2 and G91 refer to

A)circular interpolation in counter clockwise direction and incremental dimension
B)circular interpolation in counter clockwise direction and absolute dimension
C)circular interpolation in clockwise direction and incremental dimension
D)circular interpolation in clockwise direction and absolute dimension

Question 10

Numerical control

A)applies only to milling machines
B)is a method for producing exact number of parts per hour
C)is a method for controlling by means of set of instructions
D)None of the mentioned

Question 11

Computer will perform the data processing functions in

A)NC
B)CNC
C)DNC
D)None of the mentioned

Question 12

Control loop unit of M.C.U is always

A)a hardware unit
B)a software unit
C)a control unit
D)none of the mentioned

Question 13

The repeatability of NC machine depends on

A)control loop errors
B)mechanical errors
C)electrical errors
D)none of the mentioned

Question 14

Rotation about Z-axis is called………….

A)a-axis
B)b-axis
C)c-axis
D)none of the mentioned

Question 15

Rotation of spindle is designated by one of the following axis:

A)a-axis
B)b-axis
C)c-axis
D)none of the mentioned

Question 16

he linking of computer with a communication system is called………..

A)networking
B)pairing
C)interlocking
D)assembling

Question 17

The process of putting data into a storage location is called

A)reading
B)writing
C)controlling
D)hand shaking

Question 18

The process of copying data from a memory location is called

A)reading
B)writing
C)controlling
D)hand shaking

Question 19

CNC machining centres do not include operations like

A)milling
B)boring
C)welding
D)tapping

Question 20

Feed is measured in units of

A)length/revolution
B)degree/revolution
C)length
D)velocity

Question 21

he depth that the tool is plunged into the surface is called as

A)feed
B)depth of cut
C)depth of tool
D)working depth

Question 22

In CNC systems multiple microprocessors and programmable logic controllers work

A)in parallel
B)in series
C)one after the other
D)for 80% of the total machining time

Question 23

Which of the following is not the advantage of CNC machines?

A)Higher flexibility
B)Improved quality
C)Reduced scrap rate
D)Improved strength of the components

Question 24

In how many ways CNC machine tool systems can be classified?

A)2
B)3
C)4
D)5

Question 25

Point-to-point systems are used for

A)reaming
B)parting
C)grooving
D)facing

Question 26

In part programming, interpolation is used for obtaining trajectory.

A)helicoidal
B)pentagonal
C)triangular
D)zig-zag

Question 27

For CNC machining skilled part programmers are needed.

Question 28

An absolute NC system is one in which all position coordinates are referred to one fixed origin called the zero point.

Question 29

In , the coordinates are mentioned in the program with respect to one reference point

A)Incremental System
B)Absolute System
C)Datum System
D)Screen Coordinates System

Question 30

...........is a group of words or coded instruction for the NC/CNC system to execute a particular movement.

A)Sequence
B)Address
C)Code
D)Block

Question 31

Each coded instruction in a set of instructions is called as……

A)Words
B)Alphabet
C)Numbers
D)Format

Question 32

In , the coordinates are mentioned in the program with respect to one Previous point.

A)Incremental System
B)Absolute System
C)Datum System
D)Screen Coordinates System

Question 33

G00 Preparatory code is used for

A)Rapid Travel Execution
B)Rapid Travel Positioning
C)Rapid Travel sequencing
D)Rapid clockwise interpolation

Question 34

In a CNC program block, N05 GO1 G91 G33 X20 Z-40……, G33 refer to

A)Peck Drilling
B)Counter Boring
C)Thread Cutting
D)Grooving

Question 35

In CNC Program M03 is refer to……

A)Spindle ON in Clockwise rotation
B)Spindle ON in Counter Clockwise rotation
C)Spindle OFF in Clockwise rotation
D)Spindle OFF in Counter Clockwise rotation

Question 36

In CNC Program M98 is refer to……

A)CANCEL Subroutine
B)Call Sub-Program
C)Call Subroutine
D)CANCEL Sub-Program

Question 37

In a CNC program block, N05 GO1 G91 G33 X20 Z-40 K5……, K refer to

A)Depth of cut
B)Pitch
C)Multiple Threading Cycle
D)Feed

Question 38

A CNC Lathe is usually a machine tool with Z axes is…..

A)Line Joining origin and vertical movement
B)Line perpendicular to Y axis
C)Both A & B
D)Line Joining Chuck centre & tail stock centre

Question 39

B rotational axis is rotation about Axis.

A)X
B)Y
C)Z
D)C

Question 40

Secondary Linear Axes U,V & W are ……… to X,Y & Z-axis.

A)Perpendicular
B)Parallel
C)Rotational
D)All of the above

Question 41

.......... are also called as parametric subroutines

A)Micro
B)Macro
C)Sub Macro
D)Sub Micro

Question 42

In the lathe it is the peripheral speed of the work piece cutting speed of tool is expressed in m/min, V is

A)= ?DN/1000
B)= ?D/1000
C)= DN/1000
D)=?DN/10

Question 43

Incremental dimension in circular interpolation in X-axis is denoted by

A)J
B)I
C)K
D)None of the above

Question 44

Repetitive CNC machine operations conveniently performing and execute with one command instead of programming of series of individual move called …..

A)Common Cycle
B)Incremental Programming
C)Canned Cycle
D)None of the above

Question 45

In CNC programming …….. is commonly used canned cycle for Stock removal cycle

A)G71
B)G72
C)G73
D)G74

Question 46

……… is the origin of the coordinate system which is defined by manufacturer they cannot be changed

A)Blocking Point
B)machine Zero Point
C)Start Point
D)Program Zero point

Question 47

To indicate the position of the workpiece ly & easily machine zero pint should be displaced to another point on the workpiece called…

A)Workpiece zero Point
B)machine Zero Point
C)Start Point
D)Program Zero point

Question 48

XY Plane Selection in CNC machining is done by…..

A)G16
B)G17
C)G18
D)G19

Question 49

The distance of a given tool tip from the surface of workpiece is known as…..

A)Tool length
B)Tool length offset H
C)Cutter radius
D)Compensation

Question 50

In CNC machining tool radius compensation turning the left mode ON programming contour done by

A)G40
B)G41
C)G42
D)G43

Question 51

Maximum spindle speed limitation code in CNC Machine

A)G90
B)G91
C)G92
D)G93

Question 52

Which of the following code is used to return to a reference point?

A)G23
B)G28
C)G14
D)G19

Question 53

The following code will produce dwell for a specified time…

A)G18
B)G65
C)G45
D)G04

Question 54

Which of the following code will give point to point movement?

A)G00
B)G01
C)G56
D)G94

Question 55

Which rule implement for axes Nomenclature?

A)Left-hand rule
B)Right-Hand Rule
C)Thumb Rule
D)None of the above

Question 56

Automatic tool change in CNC Machine code

A)M05
B)M06
C)M07
D)M09

Question 57

Full form of MCU is…………

A)Machine computer unit
B)Machine control universal
C)Machine control unit
D)None of the above

Question 58

The machine tool, in which calculation and setting of the operating conditions like depth of cut, feed, speed are done during the machining by the control system itself, is called

A)Computer Numerical Control System
B)Direct Numerical Control System
C)Machining Center System
D)Adaptive Control System

Question 59

In which machine we get feedback?

A)Lathe machine
B)NC machine
C)CNC machine
D)Milling machine

Question 60

Which machine's spindle is used to horizontal work?

A)UMC
B)VMC
C)HMC
D)DNC

Question 61

What is the full form of ATC?

A)Automatic tool changer
B)Arranged tool changer
C)Automatic tool controller
D)Arranged tool controller

Question 62

In which system we get feedback?

A)Open-loop system
B)Machine control system
C)Closed-loop system
D)None of the above

Question 63

How many maximum tools can ATC hold?

A)60
B)80
C)90
D)100

Question 64

In the CNC machine which device used to hold the workpiece?

A)Automatic pallet changer
B)Automatic work part positioner
C)A & B both
D)None of the above

Question 65

In a CAD package, mirror image of a 2D point P (5, 10) is to be obtained about a line which passes through the origin and makes an angle of 45° counterclockwise with the X-axis. The coordinates of the transformed point will be

A)(7.5, 5)
B)(10, 5)
C)(7.5, -5)
D)(10, -5)

Question 66

NC contouring is an example of

A)Continuous path positioning
B)Point-to-point positioning
C)Absolute positioning
D)Incremental positioning

Question 67

With reference to NC machines, which of the following statements is wrong

A)Both closed-loop and open-loop control systems are used
B)Paper tapes, floppy tapes and cassettes are used for data storage
C)Digitizers may be used as interactive input devices
D)Post processor is an item of hardware

Question 68

In finish machining of an island on a casting with CNC milling machine, an end mill with 10 mm diameter is employed. The corner points of the island are represented by (0, 0), (0, 30), (50, 30) and (50, 0). By applying cutter radius right compensation, the trajectory of the cutter will be

A)(-5, 0), (-5, 35), (55, 35), (55,-5), (-5,-5)
B)(0,-5), (55,-5), (55, 35), (-5, 35), (-5,-5)
C)(5, 5), (5, 25), (45, 25), (45, 5), (5, 5)
D)(5, 5), (45, 5), (45, 25), (5, 25), (5, 5)

Question 69

The lost motion in CNC machine tool is on account of

A)Backlash in gearing
B)Wind-up of drive shafts
C)Deflection of machine tool members
D)All the above