Computer Aided Manufacturing (2171903) MCQs

MCQs of NC/CNC Machine Tools

Showing 71 to 70 out of 80 Questions
5 6 7 8
71.

Which of the following code is used to specify coolant on?

(a)

M05
(b)

M08
(c)

M09
(d)

M02
Answer:

Option (b)

72.

Which of the following code is used to specify coolant off?

(a)

M05
(b)

M08
(c)

M09
(d)

M02
Answer:

Option (c)

73.

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:

Option (c)

74.

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
Answer:

Option (a)

75.

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 code for this motion is

(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:

Option (b)

76.

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 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:

Option (a)

77.

In a CNC program block, N002 GO2 G91 X40 Z40……, GO2 and G91 refer to

(a)

circular interpolation in a counterclockwise direction and incremental dimension
(b)

circular interpolation in a counterclockwise direction and absolute dimension
(c)

circular interpolation in a clockwise direction and incremental dimension
(d)

circular interpolation in clockwise direction and absolute dimension
Answer:

Option (c)

78.

In which one of the following machinings, only manual part programming is done?

(a)

CNC
(b)

NC
(c)

DNC
(d)

FMS machining
Answer:

Option (b)

79.

The highest level of automation is found in

(a)

CNC machine tools
(b)

automatic transfer machines
(c)

DNC machining system
(d)

machine tools with electrohydraulic positioning and control
Answer:

Option (b)

80.

Which of the following code will change specified input values in inches?

(a)

G00
(b)

G01
(c)

G20
(d)

G21
Answer:

Option (c)

Showing 71 to 70 out of 80 Questions
5 6 7 8