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WorksheetsMachinist 3rd Sem Module 6 CNC turning center, Elements, Program
Total questions: 47
Worksheet time: 24mins
Name
Class
Date
1.
Which is general safety in CNC turning?
a)
Do not use non standard tools / holders
b)
Check the voltage and current
c)
Check the chuck function
d)
Check the programme control levels
2.
What is the safety check on the CNC machine after start?
a)
Check the chuck function
b)
Check the voltage and current
c)
Check the hydraulic tank oil level
d)
Check the clamping stock
3.
What is the name of machine system?
a)
Convention
b)
Auto tool changers
c)
Numerical control
d)
Computer numerical control
4.
What is the first step to stop CNC machine of an accident happen while working?
a)
Switch off regulator
b)
Press emergency switch
c)
Reset machine
d)
Reset regulator
5.
Which motor control the axes of CNC machine?
a)
Air motor
b)
DC series motor
c)
Servo motor
d)
Hydraulic motor
6.
Which mechanism reduces the back lash of CNC lathe?
a)
Stopper
b)
Clutch
c)
Recirculating ball screw with nut
d)
Break
7.
What is G04?
a)
Linear interpolation
b)
CW circular interpolation
c)
CCW Circular Interpolation
d)
Dwell time
8.
Which type of chuck is used in a CNC lathe?
a)
Two jaw chuck
b)
Three jaw chuck
c)
Hydraulic chuck
d)
Four Jaw chuck
9.
What is the maximum machining length in a CNC lathe?
a)
320 mm
b)
245 mm
c)
200 mm
d)
340 mm
10.
What is the spindle speed range in CNC machine?
a)
40-500 RAM
b)
40-4000 RAM
c)
10-600 RAM
d)
30-1000 RAM
11.
What is the name part marked as ‘X’ in block diagram of CNC machine tool?
a)
X- axis position transducer
b)
Y- axis position transducer
c)
X- axis servomotor
d)
Y- axis servomotor
12.
What types of taper is in the CNC machine spindle?
a)
ISO 40
b)
Morse taper
c)
Jarno taper
d)
Pin taper
13.
What R denotes as per ISO designation of boring bar S32USKKR12 of CNC lathe?
a)
Shank type
b)
Clearence angle
c)
Tool length
d)
Cutting direction
14.
Which describing machine tool movement in CNC?
a)
G-code
b)
M-code
c)
T-word
d)
S-word
15.
What ‘N’ of ISO insert tool specifies?
a)
Shape
b)
Grade
c)
Material
d)
Relief angle
16.
What is M8 represent in programs of CPU tapping?
a)
Coolant off
b)
Coolant on
c)
Specific direction
d)
Tapping RH threads
17.
Which code represents in more flexible and suitable for threading longitudinal transverse and tapered thread?
a)
G 76
b)
G 92
c)
G 32
d)
G 34
18.
Which preparatory code should be selected for taper threading cycle?
a)
G 32
b)
G 92
c)
G 76
d)
G 33
19.
Which G-code is used for tapping left hand thread with thread M4 in CNC program?
a)
G 74
b)
G 84
c)
G 28
d)
G 9
20.
What is the composition of stellite tool material?
a)
Cobalt, Chromium and Tungsten
b)
Cobalt, Nikel and Tungsten
c)
Cobalt, Chromium and Nikel
d)
Cobalt, Carbon and Tungsten
21.
Which is the tool selection word is specified?
a)
G-Allowed by 5 digit numbers
b)
F-Allowed by 5 digit numbers
c)
S-Allowed by 5 digit numbers
d)
T-Allowed by 5 digit numbers
22.
What is the expansion of CAD?
a)
Computer Aided Development
b)
Computer Aided Design
c)
Computer Automatic Development
d)
Computer Automatic Design
23.
Which is the disadvantage of NC system?
a)
Accuracy cannot be a change
b)
Increase compound rejection
c)
Skilled operator involves
d)
If tape is spoiled, entire program is affected
24.
Which guide way separate the surface contact between the sliding parts by a thin layer of fluid?
a)
Flat guide way
b)
Vee guide way
c)
Hydrostatic guide way
d)
Dovetail guide way
25.
When the machine moves 25.49 mm for the commond X = 25.50 mm, what must be the positional accuracy?
a)
0.001 mm
b)
0.01 mm
c)
◌্ যােভল
d)
1 mm
26.
What should be the safety precaution for holding the work piece to the lathe chuck?
a)
Cleaned
b)
Measured
c)
Clamped securly
d)
Polished
27.
Which part provides linear travel to the tool in CNC lathe?
a)
Lead screw
b)
Ball Screw
c)
Warm wheel
d)
Rack and Pinion
28.
Which axis the fore finger indicates in right hand thumb rule?
a)
Y axis
b)
X axis
c)
Z Axis
d)
A axis
29.
What is the control system of the CNC machine?
a)
Straight cut control
b)
2-D Contouring control
c)
3-D Contouring control
d)
2½ D Contouring control
30.
Which quadrant in cartesian co-ordinate will have positive value both in X and Y?
a)
Fourth
b)
Second
c)
Third
d)
First
31.
Which G-code description maximum spindle speed setting?
a)
G50
b)
G71
c)
G72
d)
G42
32.
What is the function of M02 code in part programming?
a)
Programme stop
b)
Optional stop
c)
End of programme execution
d)
Coolant ON
33.
Which code is used for peck drilling in FANUC controller system?
a)
G 80
b)
G 76
c)
G 72
d)
G 74
34.
Which G code describe machine tool movement of grooving cycle?
a)
G 73
b)
G 75
c)
G 92
d)
G 98
35.
What is the function of G 32 code?
a)
Rapid traverse
b)
Liner inter potation
c)
Thread cutting
d)
Circulation inter polation
36.
What is the role of G-wards in part programming function?
a)
Preparatory function
b)
Sequence of operation by the tool
c)
Indicate position of tool motion
d)
Specify the cutting speed process
37.
Which is the programme for depth of cut of 2.5 mm is given?
a)
N003 M0 8 G 01 X - 2.5
b)
N004 G 01 Z -2.5
c)
N004 G 01 Z -2.5
d)
N007 G 00 X + 5
38.
Which is the part programme to limit the RPM to 3000?
a)
G 92 S 3000
b)
G 96 N 3000
c)
G 00 T 3000
d)
G 01 S 250
39.
Which common word address used to miscellaneous function in CNC lathe?
a)
N
b)
G
c)
S
d)
M
40.
Which M-code is defined and implement to spindles stop?
a)
M05
b)
M08
c)
M11
d)
M14
41.
What is the code M11 defined by the machine tool?
a)
Coolant OFF
b)
Coolant ON
c)
Chuck close
d)
Door close
42.
Which code describe the auxiliary function of CNC machine?
a)
N- words
b)
M- words
c)
G- words
d)
T- words
43.
Which is the programme for simple turning operation for the length of -30 mm?
a)
N 008 G 01 Y -2.5
b)
N 011 G 00 X 020
c)
N 009 G 01 Z -30
d)
N 010 G 01 X 5 Z -30
44.
Which is the method in avoidance of collisions due to programme?
a)
Full cycle simulation
b)
Reduce motor speed
c)
Give less feed
d)
Reduce cutter speed
45.
What is the feed of CNC machine XYZ axis?
a)
1 to 2 mm/min
b)
5 to 50 mm/min
c)
1 to 1000 mm/min
d)
1 to 100 mm/min
46.
How many times the cutting speed of ceramic tool is greater than H.S.S?
a)
20 times
b)
15 times
c)
4 times
d)
42 times
47.
Which device enables crash prevention on different types of CNC machines?
a)
Encoder - dish position sensors
b)
Servo motor
c)
Control computer
d)
Comparator
Reset
