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CNC Machine Tools Quiz

Total questions: 78

Worksheet time: 42mins

Name
Class
Date
1.

HSS retain their hardness upto ____ temperature

a)

1800°C

b)

1400°C

c)

200°C

d)

900°C

2.

The basic ingredient of most carbide tools is _____

a)

Chromium

b)

Tungsten Carbide

c)

Venadium

d)

Molybdenum

3.

Cermets means ____

a)

Ceramic materials

b)

Cermaics + Metals

c)

Ceramics

d)

All the above

4.

To reduce the job setting time _______ feature is used

a)

APC

b)

Encoder

c)

ATC

d)

None

5.

Tantalum carbide + Nickel is called as _____

a)

Stellite

b)

Cermets

c)

Coated Carbides

d)

None

6.

For very low cutting speed _______ can be used as a cutting tool material

a)

HSS

b)

Stellite

c)

Cermaics

d)

Carbon Steels

7.

Select the Cutting tool material of very high cutting speed ______

a)

HSS

b)

Diamond

c)

Cermets

d)

Stellite

8.

In C Shape inserts, the included angle is _____.

a)

35°

b)

45°

c)

55°

d)

80°

9.

In CNMG indexable type inserts, the letter N stands for _________.

a)

Insert shape

b)

Clearance angle

c)

Tolerance

d)

Insert type

10.

In TNMG 22 04 08, 08 indicate ______.

a)

Insert type

b)

Insert shape

c)

Insert thickness

d)

Nose radius.

11.

HSM stands for___________

a)

Heavy speed machines

b)

High stability machines

c)

High speed machining

d)

None

12.

The measuring unit of CNC machine tools is ___________

a)

MCU

b)

ATC

c)

APC

d)

Touch trigger probes

13.

In General _______ rpm is considered for the start point of rotational speed of spindle in HSM

a)

2000

b)

20000

c)

8000

d)

None

14.

Dry run is used to______

a)

Check CNC programme

b)

Reduce machining time

c)

Programme communication

d)

None of the above

15.

MDI in CNC stands for ______

a)

Mechanical Data Input

b)

Manual Data Integration

c)

Manual Degree Input

d)

Manual Data Input

16.

To Drive the Axis as per part programme _________ is used in CNC machine tools

a)

Feed back devices

b)

Gear Drive

c)

Feed drives

d)

None

17.

Which one of the following is related to Feed drive of CNC machine tools

a)

DC Servo Motor

b)

ATC

c)

APC

d)

ATC and APC

18.

Select the Friction reducing element in CNC machine tools

a)

Spindle drive with rollers

b)

Recirculating ball and Nut

c)

LM rail with ball retainer

d)

All the above

19.

________ mode will be used when the memory space availability is less in CNC controller

a)

Auto

b)

MDI

c)

Jog

d)

Drip Feed

20.

To enter and modify the programme in CNC controller manually _____ mode is used

a)

Jog

b)

Edit

c)

MDI

d)

None

21.

To send all the Axis of the CNC machine to home position ______ mode is used

a)

Reference

b)

Edit

c)

Jog

d)

Teaching

22.

To execute the machining _____ mode is used in CNC machine tools

a)

Edit

b)

Auto

c)

Jog

d)

None

23.

______ is the controller used in CNC machine tools

a)

Siemens

b)

Fanuc

c)

Haas

d)

All the above

24.

MCU Stands for _______

a)

Modular Control Unit

b)

Modular control system

c)

Machine control uses

d)

Machine control Unit

25.

The grid plate in a CNC machine tools is ________

a)

Tool Holding

b)

Work Holding

c)

Feedback device

d)

None

26.

The Primary drawback of Open loop system is _____

a)

No DNC

b)

No feedback

c)

No ATC

d)

None

27.

Point to Point controls system is used in CNC ___________

a)

Drilling

b)

Boring

c)

Reaming

d)

All the above

28.

Straight Line control system is used in CNC __________

a)

Face Milling

b)

Pocket Milling

c)

Step Turning

d)

All the above

29.

The function of machine control unit is _________.

a)

Performs operation on machine on machine tool

b)

Prepares the part programme

c)

Reads the program & Converts into machine language & sends to Machine tool

d)

None of the above

30.

What is the use of single block switch ON/OFF in control panel?

a)

Part programming is executed automatically & continuously

b)

Part program is executed Block – wise

c)

To skip the blocks

d)

None

31.

MPG stands for ________.

a)

Manual Power Generator

b)

Manual Pulse Generator

c)

Machine Pulse Generator

d)

Manual Program Generator

32.

VMC Stands for ______.

a)

Vertical Manufacturing Centre

b)

Vertical Machining Co ordinate

c)

Vertical Machining centre

d)

none

33.

HMC Stands for ______.

a)

Horizontal Manufacturing Centre

b)

Horizontal Machining Co ordinate

c)

Horizontal Machining centre

d)

none

34.

The code G90 stands for __________

a)

Tool Change

b)

optional stop

c)

Programme end

d)

Absolute Co-oridnate system

35.

The code G91 Stands for ___________

a)

Coolant off

b)

Coolant ON

c)

Incremental Coordinate system

d)

Thread Cutting Cycle

36.

The symbol for skip function is ___________

a)

( )

b)

%

c)

#

d)

/

37.

The code G40 in milling stands for _________

a)

CRC left

b)

CRC Right

c)

CRC cancel

d)

Feed

38.

The combination of address code and data is called ________of a programme

a)

block

b)

line

c)

word

d)

skip

39.

__________ code is used to specify the function subprogramme call

a)

G98

b)

F98

c)

M98

d)

M99

40.

___________ code is used to specify the tool change function

a)

M09

b)

M06

c)

M60

d)

G28

41.

For Dwell command the preparatory function is _________

a)

G05

b)

G02

c)

G03

d)

G04

42.

Dry run is used to _____________

4 lines
43.

the tool change function

a)

M09

b)

M06

c)

M60

d)

G28

44.

For Dwell command the preparatory function is _________

a)

G05

b)

G02

c)

G03

d)

G04

45.

Dry run is used to _____________

a)

Check CNC Programme

b)

Reduce machining time

c)

Programme communication

d)

None

46.

In which of the following function feed is not required to specify

a)

G01

b)

G02

c)

G03

d)

G00

47.

The reference will change continuously in ________ co-ordinate system

a)

Absolute

b)

Polar

c)

Incremental

d)

None

48.

To stop the spindle of CNC machine tools ________ Miscellaneous function is used

a)

M96

b)

M90

c)

G05

d)

M05

49.

Tool length offset value is stored in letter ___

a)

G

b)

Z

c)

H

d)

U

50.

The “G” code used for CRC right is ___________

a)

G40

b)

G41

c)

G42

d)

G43

51.

The “G” code used for CRC left is ____________

a)

G40

b)

G41

c)

G42

d)

G43

52.

“N10 G01 X100 Y100” In this part programming line N10 stands for_____

a)

Feed

b)

Sequence No

c)

Programme No

d)

Tool No

53.

G00 is used for _________

a)

Linear interpolation

b)

Rapid positioning

c)

Zero return

d)

Circular interpolation

54.

G20 preparatory function used for ________

a)

Inch input

b)

Metric input

c)

MKS input

d)

None of the above

55.

G21 preparatory function used for ________

a)

Inch input

b)

Metric input

c)

MKS input

d)

None of the above

56.

G98 preparatory function used for

a)

Feed per minute

b)

Feed per revolution

c)

Feed in mm

d)

None of the above

57.

M00 miscellaneous function used for ______

a)

Temporary program stop

b)

Optional stop

c)

Program end

d)

Spindle stop

58.

In Which type of the following motors mechanical commutation is avoided_________

a)

DC Servo Motor

b)

Stepper Motor

c)

Brushless DC Servo Motor

d)

Micro Stepper Motor

59.

_________ Miscellaneous function is used chuck unclamp.

a)

M10

b)

M11

c)

M16

d)

M18

60.

In the programming letter I is used for ________

a)

Incremental dimension in X axis during circular interpolation

b)

Incremental dimension Y axis during circular interpolation

c)

Incremental dimension in Z axis during circular interpolation

d)

None of the above

61.

In the programming letter “O” is used for _______

a)

Program number

b)

Feed function

c)

Speed function

d)

Tool function

62.

In the program letter “T” used for_____

a)

Program number

b)

Feed function

c)

Speed function

d)

Tool function

63.

In the program letter “F” is used for_______

a)

Program number

b)

Feed function

c)

Speed function

d)

Tool function

64.

S1000 M03 in this block M03 is used for

a)

Spindle clockwise rotation

b)

Spindle counter clockwise rotation

c)

Spindle orientation

d)

None of the above

65.

In part programming address I,J,K are uses as

a)

additional axes motion commands

b)

Co-ordinate axis motion commands

c)

Co-ordinate values of arc centre

d)

Motion code

66.

Length Offset are specified by

a)

D

b)

H

c)

M

d)

P

67.

Sequence number is specified

a)

In the beginning of a block

b)

At the end of a block

c)

In the middle of a block

d)

To show the end of program

68.

In the ___________ system co-ordinates of point are always referred with reference to same datum.

a)

Absolute co-ordinate system

b)

Incremental co-ordinate system

c)

World co-ordinate system

d)

None of the above

69.

In the ________ system co-ordinates of any points are calculated with reference to previous point.

a)

Absolute co-ordinate system

b)

Incremental co-ordinate system

c)

User co-ordinate system

d)

None of the above

70.

In the programming letter J is used for ________

a)

Incremental dimension Y axis during circular interpolation

b)

Incremental dimension in Z axis during circular interpolation

c)

Incremental dimension in X axis during circular interpolation

d)

None of the above

71.

In the programming letter K is used for ________

a)

Incremental dimension Y axis during circular interpolation

b)

Incremental dimension in Z axis during circular interpolation

c)

Incremental dimension in X axis during circular interpolation

d)

None of the above

72.

G letter used for to specify ______

a)

Preparatory function

b)

Sequence number

c)

Feed

d)

None of the above

73.

G00 X 70 Z-10 In this block, which is called DATA.

a)

00 70 -10

b)

G X Z

c)

G00 X 70 Z-10

d)

None of the above

74.

In the CNC program Letter “S” is used to specify _______

a)

Speed function

b)

Tool function

c)

Feed function

d)

chamfering amount.

75.

In the CNC program letter “ R” is used to specify ______

a)

Radius of arc, Retraction amount.

b)

Speed function

c)

Feed function

d)

Incremental dimension

76.

A set of Operations which is repeated regularly in the same sequence _________

a)

Cycle

b)

Contour

c)

Offset

d)

dwell

77.

Which one of the following codes fall into motion group commands

a)

G18

b)

G17

c)

G01

d)

G70

78.

_________ Preparatory function is used for the selection of XZ plane in a 3 Axis VMC

a)

G17

b)

G18

c)

G21

d)

None

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