Machine Dynamics Questions and Answers – Computer Aided Analysis for Four Bar Mechanism

This set of Basic Machine Dynamics Questions and Answers focuses on “Computer Aided Analysis for Four Bar Mechanism”.

1. In a CAD package, mirror image of a 2D point P (5, 10) is to be obtained about a line which passes through the origin and makes an angle of 45° counterclockwise with the X-axis. The coordinates of the transformed point will be
a) (7.5, 5)
b) (10, 5)
c) (7.5, -5)
d) (10, -5)
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2. In a CNC program block, N002 G02 G91 X40 Z40…, G02 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
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3. For generating Coons patch we require
a) A set of grid points on surface
b) A set of control points
c) Four bounding curves defining surface
d) Two bounding curves and a set of grid control points
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4. NC contouring is an example of
a) Continuous path positioning
b) Point-to-point positioning
c) Absolute positioning
d) Incremental positioning
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5. The tool of an NC machine has to move along a circular arc from (5, 5) to (10, 10) while performing an operation. The center of the arc is at (10, 5). Which one of the following NC tool path commands performs the above mentioned operation?
a) N010 G02 X10 Y10 X5 Y5 R5
b) N010 G03 X10 Y10 X5 Y5 R5
c) N010 G01 X5 Y5 X10 Y10 R5
d) N010 G02 X5 Y5 X10 Y10 R5
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6. 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
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7. In a 2-D CAD package, clockwise circular arc of radius, 5, specified from P1 (15,10) to P2 (10,15)will have its center at
a) (10, 10)
b) (15, 10)
c) (15, 15)
d) (10, 15)
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8. In an NC machining operation, the tool has to be moved from point (5,4) to point (7,2) along a circular path with center at (5,2). Before starting the operation, the tool is at (5, 4). The correct G and M code for this motion is
a) N010 G03 X7.0 Y2.0 I5.0 J2.0
b) N010 G02 X7.0 Y2.0 I5.0 J2.0
c) N010 G01 X7.0 Y2.0 I5.0 J2.0
d) N010 G00 X7.0 Y2.0 I5.0 J2.0
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9. In computer aided drafting practice, an arc is defined by
a) Two end points only
b) Center and radius
c) Radius and one end point
d) Two end points and center
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10. In finish machining of an island on a casting with CNC milling machine, an end mill with 10 mm diameter is employed. The corner points of the island are represented by (0, 0), (0, 30), (50, 30) and (50, 0). By applying cutter radius right compensation, the trajectory of the cutter will be
a) (-5, 0), (-5, 35), (55, 35), (55,-5), (-5,-5)
b) (0,-5), (55,-5), (55, 35), (-5, 35), (-5,-5)
c) (5, 5), (5, 25), (45, 25), (45, 5), (5, 5)
d) (5, 5), (45, 5), (45, 25), (5, 25), (5, 5)
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