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WorksheetsMachinist Grinder 4th Sem Module 7 : CNC Safety and M/c Element
Total questions: 26
Worksheet time: 13mins
Name
Class
Date
1.
What is marked as 'x'?
a)
Machine control unit
b)
Program
c)
Machine tool
d)
Servo motor
2.
What is the advantage of CNC?
a)
Higher initial cost
b)
Higher repeatability and Accuracy
c)
Higher inspection rate
d)
Highly skilled operator
3.
Which classification is based on feedback control system?
a)
Absolute positioning system
b)
Closed loop system
c)
Positional system
d)
Incremental positioning system
4.
What is the advantage of ball screw for feed drive?
a)
Motor drive only
b)
More cost
c)
Higher accuracy
d)
High power requirement
5.
Which type control system is gives axis position value on monitor?
a)
Position control
b)
Closed loop control
c)
Pulse frequency
d)
Open loop control
6.
What is the function of G00?
a)
Linear motion with feed rate
b)
Rapid motion
c)
Clockwise direction
d)
Counter clock wise direction
7.
Which is the CNC language?
a)
Binary code
b)
Assembly language
c)
G-code and M-code
d)
Machine language
8.
What is the principle of CNC?
a)
Control by auto mechanism
b)
Control by program
c)
Control by operator
d)
Control by cam’s
9.
Which is the disadvantage of CNC?
a)
Reduce inspection time
b)
Rejection almost nil
c)
High initial cost
d)
High accuracy
10.
How CNC is classified for circuit technology?
a)
Electric system
b)
Analog and Digital system
c)
Hydraulic system
d)
Positional system
11.
Which feed drive is used to start and stop CNC quickly and accurately?
a)
AC servo motors
b)
DC servo motors
c)
Stepped motors
d)
Brushless DC servo motors
12.
Which control system is operated in 3-axis?
a)
Contouring control
b)
Point to print control
c)
Straight cut control
d)
2D-control
13.
Which address code is denoted tool height offset?
a)
M
b)
F
c)
T
d)
H
14.
Which switch is used to stop the machine suddenly?
a)
Cycle stop
b)
Emergency stop
c)
Toggle switch
d)
Spindle stop
15.
Which part is used to prevent access into CNC milling?
a)
Door
b)
Control panel
c)
Machine table
d)
Machine spindle
16.
Which machine is operated with less labour?
a)
Conventional machine
b)
NC machine
c)
CNC machine
d)
DNC machine
17.
Which is the advantage of CNC machine over conventional machines?
a)
High cutting speed
b)
Feed back control
c)
High feed
d)
Mass production
18.
Which is a measure of a systems consistency to achieve identical results?
a)
Accuracy
b)
Tolerance
c)
Repeatability
d)
Allowance
19.
What is termed as the difference between the theoretical coordinate to actual movement?
a)
Position accuracy
b)
Repeatability
c)
Machine accuracy
d)
Machine tolerance
20.
What is the function of ball lead screw mechanism in CNC machine?
a)
To reduce set up time
b)
For higher surface finish
c)
To perform up milling
d)
To remove backlash
21.
What is marked as 'x'?
a)
Screw shaft
b)
Balls
c)
Ball screw nut
d)
Seal
22.
Expand the abbreviation of 'LM' guide ways?
a)
Local motion
b)
Line motion
c)
Linear motion
d)
Lean motion
23.
Which guide ways eliminate the stick-slip action?
a)
Linear motion guide ways
b)
Hydrostatic guide ways
c)
Aerostatic guide ways
d)
Antifriction guide ways
24.
Which is the back devices used in indirect measuring system?
a)
Encoders
b)
Sensors
c)
Measuring system
d)
Inductosyns
25.
Which converts data from one form to another form?
a)
Encoders
b)
Sensor
c)
Transistor
d)
Oscillator
26.
How many types of encoders are available?
a)
2
b)
3
c)
4
d)
5
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