McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 1. |
CAD/CAM is the relationship between |
| A. | science and engineering |
| B. | manufacturing and marketing |
| C. | design and manufacturing |
| D. | design and marketing |
| Answer» C. design and manufacturing | |
| 2. |
Which two disciplines are tied by a common database? |
| A. | documentation and geometric modeling |
| B. | CAD and CAM |
| C. | drafting and documentation |
| D. | none of the mentioned |
| Answer» B. CAD and CAM | |
| 3. |
The term that is used for geometric modelling like solid modelling, wire frame modelling and drafting is known as |
| A. | software package |
| B. | operating system |
| C. | application software |
| D. | none of the mentioned |
| Answer» A. software package | |
| 4. |
The software that is used to control the computer’s work flow, organize its data and perform housekeeping functions is known as |
| A. | operating software |
| B. | graphics software |
| C. | application software |
| D. | programming software |
| Answer» A. operating software | |
| 5. |
During the execution of a CNC part program block NO20 GO2 X45.0 Y25.0 R5.0 the type of tool motion will be |
| A. | circular Interpolation – clockwise |
| B. | circular Interpolation – counter clockwise |
| C. | linear Interpolation |
| D. | rapid feed |
| Answer» A. circular Interpolation – clockwise | |
| 6. |
n an NC machining operation, the tool has to be moved from point (5, 4) to point (7, 2) along a circular path with centre at (5, 2). Before starting the operation, the tool is at (5, 4). The G and N codes for this motion are |
| A. | N010 GO3 X7.0 Y2.0 I5.0 J2.0 |
| B. | N010 GO2 X7.0 Y2.0 I5.0 J2.0 |
| C. | N010 GO1 X7.0 Y2.0 I5.0 J2.0 |
| D. | N010 GOO X7.0 Y2.0 I5.0 J2.0 |
| Answer» B. N010 GO2 X7.0 Y2.0 I5.0 J2.0 | |
| 7. |
The 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 command performs the above mentioned operation? |
| A. | N010 GO2 X10 Y10 X5 Y5 R5 |
| B. | N010 GO3 X10 Y10 X5 Y5 R5 |
| C. | N010 GO1 X5 Y5 X10 Y10 R5 |
| D. | N010 GO2 X5 Y5 X10 Y10 R5 |
| Answer» A. N010 GO2 X10 Y10 X5 Y5 R5 | |
| 8. |
Match the following: NC code Definition P. M05 1. Absolute coordinate system Q. G01 2. Dwell R. G04 3. Spindle stop S. G09 4. Linear interpolation |
| A. | P-2, Q-3, R-4, S-1 |
| B. | P-3, Q-4, R-1, S-2 |
| C. | P-3, Q-4, R-2, S-1 |
| D. | P-4, Q-3, R-2, S-1 |
| Answer» C. P-3, Q-4, R-2, S-1 | |
| 9. |
In a CNC program block, N02 GO2 G91 X40 Z40……, GO2 and G91 refer to |
| A. | circular interpolation in counter clockwise direction and incremental dimension |
| B. | circular interpolation in counter clockwise direction and absolute dimension |
| C. | circular interpolation in clockwise direction and incremental dimension |
| D. | circular interpolation in clockwise direction and absolute dimension |
| Answer» C. circular interpolation in clockwise direction and incremental dimension | |
| 10. |
Numerical control |
| A. | applies only to milling machines |
| B. | is a method for producing exact number of parts per hour |
| C. | is a method for controlling by means of set of instructions |
| D. | None of the mentioned |
| Answer» C. is a method for controlling by means of set of instructions | |
| 11. |
Computer will perform the data processing functions in |
| A. | NC |
| B. | CNC |
| C. | DNC |
| D. | None of the mentioned |
| Answer» B. CNC | |
| 12. |
Control loop unit of M.C.U is always |
| A. | a hardware unit |
| B. | a software unit |
| C. | a control unit |
| D. | none of the mentioned |
| Answer» A. a hardware unit | |
| 13. |
The repeatability of NC machine depends on |
| A. | control loop errors |
| B. | mechanical errors |
| C. | electrical errors |
| D. | none of the mentioned |
| Answer» B. mechanical errors | |
| 14. |
Rotation about Z-axis is called…………. |
| A. | a-axis |
| B. | b-axis |
| C. | c-axis |
| D. | none of the mentioned |
| Answer» C. c-axis | |
| 15. |
Rotation of spindle is designated by one of the following axis: |
| A. | a-axis |
| B. | b-axis |
| C. | c-axis |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 16. |
he linking of computer with a communication system is called……….. |
| A. | networking |
| B. | pairing |
| C. | interlocking |
| D. | assembling |
| Answer» A. networking | |
| 17. |
The process of putting data into a storage location is called |
| A. | reading |
| B. | writing |
| C. | controlling |
| D. | hand shaking |
| Answer» B. writing | |
| 18. |
The process of copying data from a memory location is called |
| A. | reading |
| B. | writing |
| C. | controlling |
| D. | hand shaking |
| Answer» A. reading | |
| 19. |
CNC machining centres do not include operations like |
| A. | milling |
| B. | boring |
| C. | welding |
| D. | tapping |
| Answer» C. welding | |
| 20. |
Feed is measured in units of |
| A. | length/revolution |
| B. | degree/revolution |
| C. | length |
| D. | velocity |
| Answer» A. length/revolution | |
| 21. |
he depth that the tool is plunged into the surface is called as |
| A. | feed |
| B. | depth of cut |
| C. | depth of tool |
| D. | working depth |
| Answer» B. depth of cut | |
| 22. |
In CNC systems multiple microprocessors and programmable logic controllers work |
| A. | in parallel |
| B. | in series |
| C. | one after the other |
| D. | for 80% of the total machining time |
| Answer» A. in parallel | |
| 23. |
Which of the following is not the advantage of CNC machines? |
| A. | Higher flexibility |
| B. | Improved quality |
| C. | Reduced scrap rate |
| D. | Improved strength of the components |
| Answer» D. Improved strength of the components | |
| 24. |
In how many ways CNC machine tool systems can be classified? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 25. |
Point-to-point systems are used for |
| A. | reaming |
| B. | parting |
| C. | grooving |
| D. | facing |
| Answer» A. reaming | |
| 26. |
In part programming, interpolation is used for obtaining trajectory. |
| A. | helicoidal |
| B. | pentagonal |
| C. | triangular |
| D. | zig-zag |
| Answer» A. helicoidal | |
| 27. |
For CNC machining skilled part programmers are needed. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 28. |
An absolute NC system is one in which all position coordinates are referred to one fixed origin called the zero point. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 29. |
In , the coordinates are mentioned in the program with respect to one reference point |
| A. | Incremental System |
| B. | Absolute System |
| C. | Datum System |
| D. | Screen Coordinates System |
| Answer» B. Absolute System | |
| 30. |
……… is a group of words or coded instruction for the NC/CNC system to execute a particular movement. |
| A. | Sequence |
| B. | Address |
| C. | Code |
| D. | Block |
| Answer» D. Block | |
| 31. |
Each coded instruction in a set of instructions is called as…… |
| A. | Words |
| B. | Alphabet |
| C. | Numbers |
| D. | Format |
| Answer» A. Words | |
| 32. |
In , the coordinates are mentioned in the program with respect to one Previous point. |
| A. | Incremental System |
| B. | Absolute System |
| C. | Datum System |
| D. | Screen Coordinates System |
| Answer» A. Incremental System | |
| 33. |
G00 Preparatory code is used for |
| A. | Rapid Travel Execution |
| B. | Rapid Travel Positioning |
| C. | Rapid Travel sequencing |
| D. | Rapid clockwise interpolation |
| Answer» B. Rapid Travel Positioning | |
| 34. |
In a CNC program block, N05 GO1 G91 G33 X20 Z-40……, G33 refer to |
| A. | Peck Drilling |
| B. | Counter Boring |
| C. | Thread Cutting |
| D. | Grooving |
| Answer» C. Thread Cutting | |
| 35. |
In CNC Program M03 is refer to…… |
| A. | Spindle ON in Clockwise rotation |
| B. | Spindle ON in Counter Clockwise rotation |
| C. | Spindle OFF in Clockwise rotation |
| D. | Spindle OFF in Counter Clockwise rotation |
| Answer» A. Spindle ON in Clockwise rotation | |
| 36. |
In CNC Program M98 is refer to…… |
| A. | CANCEL Subroutine |
| B. | Call Sub-Program |
| C. | Call Subroutine |
| D. | CANCEL Sub-Program |
| Answer» B. Call Sub-Program | |
| 37. |
In a CNC program block, N05 GO1 G91 G33 X20 Z-40 K5……, K refer to |
| A. | Depth of cut |
| B. | Pitch |
| C. | Multiple Threading Cycle |
| D. | Feed |
| Answer» B. Pitch | |
| 38. |
A CNC Lathe is usually a machine tool with Z axes is….. |
| A. | Line Joining origin and vertical movement |
| B. | Line perpendicular to Y axis |
| C. | Both A & B |
| D. | Line Joining Chuck centre & tail stock centre |
| Answer» D. Line Joining Chuck centre & tail stock centre | |
| 39. |
B rotational axis is rotation about Axis. |
| A. | X |
| B. | Y |
| C. | Z |
| D. | C |
| Answer» A. X | |
| 40. |
Secondary Linear Axes U,V & W are ……… to X,Y & Z-axis. |
| A. | Perpendicular |
| B. | Parallel |
| C. | Rotational |
| D. | All of the above |
| Answer» B. Parallel | |
| 41. |
……… are also called as parametric subroutines |
| A. | Micro |
| B. | Macro |
| C. | Sub Macro |
| D. | Sub Micro |
| Answer» B. Macro | |
| 42. |
In the lathe it is the peripheral speed of the work piece cutting speed of tool is expressed in m/min, V is |
| A. | = 𝜋𝐷𝑁/1000 |
| B. | = 𝜋𝐷/1000 |
| C. | = 𝐷𝑁/1000 |
| D. | =𝜋𝐷𝑁/10 |
| Answer» A. = 𝜋𝐷𝑁/1000 | |
| 43. |
Incremental dimension in circular interpolation in X-axis is denoted by |
| A. | J |
| B. | I |
| C. | K |
| D. | None of the above |
| Answer» B. I | |
| 44. |
Repetitive CNC machine operations conveniently performing and execute with one command instead of programming of series of individual move called ….. |
| A. | Common Cycle |
| B. | Incremental Programming |
| C. | Canned Cycle |
| D. | None of the above |
| Answer» C. Canned Cycle | |
| 45. |
In CNC programming …….. is commonly used canned cycle for Stock removal cycle |
| A. | G71 |
| B. | G72 |
| C. | G73 |
| D. | G74 |
| Answer» D. G74 | |
| 46. |
……… is the origin of the coordinate system which is defined by manufacturer they cannot be changed |
| A. | Blocking Point |
| B. | machine Zero Point |
| C. | Start Point |
| D. | Program Zero point |
| Answer» B. machine Zero Point | |
| 47. |
To indicate the position of the workpiece ly & easily machine zero pint should be displaced to another point on the workpiece called… |
| A. | Workpiece zero Point |
| B. | machine Zero Point |
| C. | Start Point |
| D. | Program Zero point |
| Answer» A. Workpiece zero Point | |
| 48. |
XY Plane Selection in CNC machining is done by….. |
| A. | G16 |
| B. | G17 |
| C. | G18 |
| D. | G19 |
| Answer» B. G17 | |
| 49. |
The distance of a given tool tip from the surface of workpiece is known as….. |
| A. | Tool length |
| B. | Tool length offset H |
| C. | Cutter radius |
| D. | Compensation |
| Answer» B. Tool length offset H | |
| 50. |
In CNC machining tool radius compensation turning the left mode ON programming contour done by |
| A. | G40 |
| B. | G41 |
| C. | G42 |
| D. | G43 |
| Answer» B. G41 | |
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