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Free download in PDF CNC Machine Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
In machining of a workpiece, the material is removed by_____
[A]
shearing acting
[B]
using brittleness of the material
[C]
drilling action
[D]
melting action
(2)
The depth that the tool is plunged into the surface is called as ______
[A]
depth of cut
[B]
working depth
[C]
depth of tool
[D]
feed
(3)
Feed is measured in units of _____
[A]
velocity
[B]
length
[C]
length/revolution
[D]
degree/revolution
Answer: length/revolution
(4)
CNC machining centres do not include operations like ______
[A]
welding
[B]
tapping
[C]
milling
[D]
boring
(5)
In CNC systems multiple microprocessors and programmable logic controllers work ______
[A]
in series
[B]
in parallel
[C]
for 80% of the total machining time
[D]
one after the other
(6)
Which of the following is not the advantage of CNC machines?
[A]
Reduced scrap rate
[B]
Improved strength of the components
[C]
Higher flexibility
[D]
Improved quality
Answer: Improved strength of the components
(7)
In how many ways CNC machine tool systems can be classified?
(8)
Which machine tools are basically handled and controlled by Computer Numerical Control (CNC) machine especially at the manufacturing sector?
[A]
Mills & Grinders
[B]
Routers
[C]
Lathes
[D]
All of the above
(9)
Which kind of switches examine or detect the presence of an item or object without making contact with them?
[A]
Proximity Switches
[B]
Reed Switches
[C]
Photo-electric Switches
[D]
Mechanical Switches
Answer: Proximity Switches
(10)
Which bus forms an intermediate communication path between input/output ports and input/output units?
[A]
Address Bus
[B]
System Bus
[C]
Data Bus
[D]
Control Bus
(11)
Which unit of PIC undergo the process of converting mains ac voltage to low dc voltage required for the circuits and the input-output interfacing modules ?
[A]
Power Supply Unit
[B]
Input/Output Unit
[C]
Memory Unit
[D]
Processing Unit
Answer: Power Supply Unit
(12)
Which machine tool reduces the number of set-ups in machining operation, time spent in setting machine tools and transportation between sections of machines?
[A]
Machining centre
[B]
Adaptive Control Systems
[C]
Direct Numerical Control machine tool
[D]
Computer Numerical Control machine tool
(13)
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]
Adaptive Control System
[B]
Machining Centre System
[C]
Computer Numerical Control System
[D]
Direct Numerical Control System
Answer: Adaptive Control System
(14)
Part-programming mistakes can be avoided in
[A]
CNC (Computer Numerical Control) machine tool
[B]
NC (Numerical Control) machine tool
[C]
Both a. and b.
[D]
None of the above
Answer: CNC (Computer Numerical Control) machine tool
(15)
Several machine tools can be controlled by a central computer in
[A]
DNC (Direct Numerical Control) machine tool
[B]
CCNC (Central-Computer Numerical Control) machine tool
[C]
NC (Numerical Control) machine tool
[D]
CNC (Computer Numerical Control) machine tool
Answer: DNC (Direct Numerical Control) machine tool
(16)
In CNC machine tool, the part program entered into the computer memory
[A]
can be used only once
[B]
can be used again but it has to be modified every time
[C]
cannot say
[D]
can be used again and again
Answer: can be used again and again
(17)
Which of the following options is correct for the control unit and panel of NC (Numerical Control) and CNC (Computer Numerical Control) machine tools?
[A]
The control unit of NC machine tool works in ON-line mode and the control unit of CNC machine tool works in batch processing mode
[B]
The control unit of NC machine tool works in batch processing mode and the control unit of CNC machine tool works in ON-line mode
[C]
The control units of both NC and CNC machines work in ON-line mode
[D]
The control units of both NC and CNC machines work in batch processing mode
Answer: The control unit of NC machine tool works in batch processing mode and the control unit of CNC machine tool works in ON-line mode
(18)
In NC (Numerical Control) machine tool, the position feedback package is connected between
[A]
control unit and programmer
[B]
programmer and machine tool
[C]
control unit and machine tool
[D]
None of the above
Answer: control unit and machine tool
(19)
The device, fed to the control unit of NC machine tool which sends the position command signals to sideway transmission elements of the machine, is called as
[A]
tape
[B]
controller
[C]
feedback unit
[D]
none of the above
(20)
In part programming, interpolation is used for obtaining _______ trajectory.
[A]
helicoidal
[B]
zig-zag
[C]
pentagonal
[D]
triangular
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