Certificate in CNC Operator /30 0 Your Examination is Complete !You will get your result in your email id within 10 days.kindly also email your 10th Marskheet and Aadhar Card copy at iisdtindia@gmail.com. Certificate in CNC Operator 1 / 30Which one of the following is not the advantage of the CNC machine? Reduce inspection time Reduces tooling time Higher rate of production Higher initial cost 2 / 30Which of the following software interprets an NC part program? Application software Machine interface software Operating system Machine sequencing system 3 / 30Feed is measured in units of __________. length/revolution degree/revolution length degree 4 / 30To monitor the position of the slides, which types of transducers are used? Linear transducers Rotary transducers Linear transducers and rotary transducers None of the mentioned 5 / 30The machine control unit in CNC machines consists of which of the followingcomponents? I/O Interface Scanners Plotters Processing equipment 6 / 30______ allows the user to input and edit part programs Control program Executive program Machine interface program Editor 7 / 30Which machine tool reduces the number of set-ups in machining operation, time spent in setting machine tools and transportation between sections of machines? Computer Numerical Control machine tool Direct Numerical Control machine tool Adaptive Control Systems Machining centre 8 / 30In which one of the following machining’s, only manual part programming is done? CNC NC DNC FMS machining 9 / 30In a CNC program block, N002 GO2 G91 X40 Z40……, GO2 and G91 refer to. circular interpolation in a counterclockwise direction and incremental dimension circular interpolation in a counterclockwise direction and absolute dimension circular interpolation in a clockwise direction and incremental dimension circular interpolation in clockwise direction and absolute dimension 10 / 30CNC machine has the following main advantage over conventional machining practice. Ability to employ higher cutting speeds, feeds and depth of cut Feedback control Flexibility None of the mentioned 11 / 30The 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 Computer Numerical Control System Direct Numerical Control System Machining Centre System Adaptive Control System 12 / 30During the execution of a CNC part program block NO20 GO2 X45.0 Y25.0 R5.0 the type of tool motion will be circular Interpolation – clockwise circular Interpolation – counterclockwise linear Interpolation rapid feed 13 / 30Which of the following is not a CNC software? Machine sequencing software Operating system Machine interface software Application software 14 / 30The central processing unit in CNC consists of which of the following parts? Read Only Memory Arithmetic Logic Unit Secondary memory Operating System Unit 15 / 30G-codes are also known as preparatory codes spindle speed codes tool selection codes miscellaneous codes 16 / 30With reference to NC machines, which of the following statements is wrong? Both closed-loop and open-loop control systems are used Paper tapes, floppy disks, and magnetic tapes are used for data storage Digitizers may be used as interactive input devices Post processor is an item of hardware 17 / 30The depth that the tool is plunged into the surface is called as ___________. feed depth of cut depth of tool working depth 18 / 30Part-programming mistakes can be avoided in NC (Numerical Control) machine tool CNC (Computer Numerical Control) machine tool Both a. and b. None of the above 19 / 30Operating System is stored in which memory? Secondary memory Random Access Memory Immediate Access Memory Read Only Memory 20 / 30In NC (Numerical Control) machine tool, the position feedback package is connectedbetween control unit and programmer programmer and machine tool control unit and machine tool programmer and process planning 21 / 30________ operates the communication link between CPU and processing equipment. Machine interface software Operating system Control program Application software 22 / 30Several machine tools can be controlled by a central computer in NC (Numerical Control) machine tool CNC (Computer Numerical Control) machine tool DNC (Direct Numerical Control) machine tool CCNC (Central-Computer Numerical Control) machine tool 23 / 30CNC machining centres do not include operations like ______. milling boring welding tapping 24 / 30The machine control unit in modern CNC comprises which of the following types ofcomputers? Minicomputer Supercomputer Microcomputer Mainframe computer 25 / 30Point-to-point systems are used for _____. reaming parting grooving facing 26 / 30In machining of a workpiece, the material is removed by________. drilling action melting action shearing acting using brittleness of the material 27 / 30The 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 commands performs the above-mentioned operation? N010 GO2 X10 Y10 X5 Y5 R5 N010 GO3 X10 Y10 X5 Y5 R5 N010 GO1 X5 Y5 X10 Y10 R5 N010 GO2 X5 Y5 X10 Y10 R5 28 / 30The highest level of automation is found in CNC machine tools automatic transfer machines DNC machining system machine tools with electrohydraulic positioning and control 29 / 30In CNC machine tool, the part program entered into the computer memory can be used only once can be used again and again can be used again but it has to be modified every time cannot say 30 / 30The 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 controller tape feedback unit none of the above Exit
