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MCQ - Mechanical TNPSC JTO
JTO - 534 - Advanced Computer Numerical Control - 534 - Unit X 4th Axis on VMC

51)   

In VMCs with a 4th axis rotary table, which method is used to lock the axis during alignment?

A.
B.
C.
D.
Answer: C
52)   

The rotary axis alignment should always be verified:

A.
B.
C.
D.
Answer: D
53)   

When setting a fixture on the 4th axis, the axis should be:

A.
B.
C.
D.
Answer: C
54)   

To find true centerline of rotation of 4th axis, you use:

A.
B.
C.
D.
Answer: B
55)   

When aligning the 4th axis, which value is critical for precision rotary motion?

A.
B.
C.
D.
Answer: C
56)   

What is the primary reason for zero-point calibration of the 4th axis?

A.
B.
C.
D.
Answer: B
57)   

If the rotary axis (A-axis) is not locked during cutting, what could happen?

A.
B.
C.
D.
Answer: C
58)   

Which tool is used to check flatness of the rotary table while aligning?

A.
B.
C.
D.
Answer: B
59)   

How is angular referencing typically performed in CNC rotary tables?

A.
B.
C.
D.
Answer: B
60)   

What is the standard referencing position of the rotary A-axis?

A.
B.
C.
D.
Answer: C
61)   

In most CNC systems, which function is used to send all axes including the 4th axis to home/reference position?

A.
B.
C.
D.
Answer: C
62)   

A rotary axis offset error can result in

A.
B.
C.
D.
Answer: B
63)   

During alignment, a test bar is used to:

A.
B.
C.
D.
Answer: B
64)   

In CNC 4th axis machines, referencing is stored in:

A.
B.
C.
D.
Answer: B
65)   

Which axis moves when rotary indexing is done about the A-axis?

A.
B.
C.
D.
Answer: B
66)   

In 4-axis machining, the part is typically rotated using the:

A.
B.
C.
D.
Answer: C
67)   

A servo-controlled 4th axis allows:

A.
B.
C.
D.
Answer: C
68)   

The main difference between indexing and continuous 4-axis machining is:

A.
B.
C.
D.
Answer: C
69)   

Which of the following workpieces would benefit most from continuous 4-axis machining?

A.
B.
C.
D.
Answer: C
70)   

In 4-axis programming, continuous movement requires

A.
B.
C.
D.
Answer: B
71)   

 What limitation does a basic manual indexer have compared to a CNC-controlled 4th axis?

A.
B.
C.
D.
Answer: C
72)   

Which feature distinguishes simultaneous 4-axis machining from standard 3+1 axis?

A.
B.
C.
D.
Answer: B
73)   

To avoid tool marks on cylindrical parts during 4-axis continuous machining, what is critical?

A.
B.
C.
D.
Answer: C
74)   

A job requires drilling holes at 45° intervals around a circular face. Which type of 4-axis motion is ideal?

A.
B.
C.
D.
Answer: B
75)   

Which of the following G-codes is commonly used for synchronized 4-axis machining with A-axis?

A.
B.
C.
D.
Answer: C