Engineering Questions with Answers - Multiple Choice Questions
Manufacturing Engineering – Computer Integrated Manufacturing
1 - Question
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 – counterclockwise
c) linear Interpolation
d) rapid feed
View Answer
Explanation: Given:-NO20 GO2 X45.0 Y25.0 R5.0 Here term X45.0 Y25.0 R5.0 will produce circular motion because radius is consider in this term and GO2 will produce clockwise motion of the tool.
2 - Question
In 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 correct G and N codes for this motion are
a) N010GO3X7.0Y2.0I5.0J2.0
b) N010GO2X7.0Y2.0I5.0J2.0
c) N010GO1X7.0Y2.0I5.0J2.0
d) N010GOOX7.0Y2.0I5.0J2.0
View Answer
Explanation: Given : Initial point (5, 4), Final point (7, 2), Centre (5, 4) So, the G, N codes for this motion are N010GO2X7.0Y2.0 15.0J2.0 where, GO2 ” Clockwise circular interpolation X7.0Y2.0 ” Final point I5.0J2.0 ” Centre point.
3 - Question
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
View Answer
Explanation: N010 “represent start the operation GO2 “represent circular (clock wise) interpolation X10Y10 “represent final coordinates X5Y5 “represent starting coordinate R5 “represent radius of the arc So, NC tool path command is, N010 GO2 X10 Y10 X5 Y5 R5.
4 - Question
NC contouring is an example of
a) continuous path positioning
b) point-to-point positioning
c) absolute positioning
d) incremental positioning
View Answer
Explanation: NC contouring is a continuous path positioning system. Its function is to synchronize the axes of motion to generate a predetermined path, generally a line or a circular arc.
5 - Question
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
View Answer
Explanation: NC code Definition P. M05 3. Spindle stop Q. G01 4. Linear interpolation R. G04 2. Dwell S. G09 1. Absolute coordinate system So, correct pairs are, P-3, Q-4, R-2, S-1.
6 - Question
In a CNC program block, N002 GO2 G91 X40 Z40……,GO2 and G91 refer to
a) circular interpolation in counterclockwise direction and incremental dimension
b) circular interpolation in counterclockwise direction and absolute dimension
c) circular interpolation in clockwise direction and incremental dimension
d) circular interpolation in clockwise direction and absolute dimension
View Answer
Explanation: GO2 represent circular interpolation in clockwise direction. G91 represent incremental dimension.
7 - Question
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
View Answer
Explanation: NC is a method for controlling by means of set of instructions. CNC performs the data processing functions.
8 - Question
Computer will perform the data processing functions in
a) NC
b) CNC
c) DNC
d) None of the mentioned
View Answer
Explanation: NC is a method for controlling by means of set of instructions. CNC performs the data processing functions.
9 - Question
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
View Answer
Explanation: None.
10 - Question
The repeatability of NC machine depends on
a) control loop errors
b) mechanical errors
c) electrical errors
d) none of the mentioned
View Answer
Explanation: None.
11 - Question
Rotation about Z-axis is called
a) a-axis
b) b-axis
c) c-axis
d) none of the mentioned
View Answer
Explanation: Rotation about X-axis is called a-axis. Rotation about Y-axis is called b-axis. Rotation about Z-axis is called c-axis.
12 - Question
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
View Answer
Explanation: None.
13 - Question
The linking of computer with a communication system is called
a) networking
b) pairing
c) interlocking
d) assembling
View Answer
Explanation: Networking is the practice of linking two or more computing devices together for the purpose of sharing data. Pairing is the linking of computer with a communication system. Interlocking is to fit into each other, as parts of machinery, so that all action is synchronized.
14 - Question
The process of putting data into a storage location is called
a) reading
b) writing
c) controlling
d) hand shaking
View Answer
Explanation: Reading is the process of copying data from a memory location. Writing is the process of putting data into a storage location.
15 - Question
The process of copying data from a memory location is called
a) reading
b) writing
c) controlling
d) hand shaking
View Answer
Explanation: Reading is the process of copying data from a memory location. Writing is the process of putting data into a storage location.