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MCQ - Mechanical TNPSC JTO
JTO - 534 - Advanced Computer Numerical Control - 534 - Unit IV Introduction CNC Machines

51)   

Which G-code must follow a G41 or G42 before actual cutting begins?

A.
B.
C.
D.
Answer: C
52)   

Tool nose radius compensation is most useful when machining:

A.
B.
C.
D.
Answer: C
53)   

What does G40 do in CNC turning?

A.
B.
C.
D.
Answer: B
54)   

Which G-code sequence is correct for tool nose radius compensation to the left of contour?

A.
B.
C.
D.
Answer: B
55)   

In G76 P020060, the 60 at the end stands for:

A.
B.
C.
D.
Answer: C
56)   

In G76 threading, Q200 refers to:

A.
B.
C.
D.
Answer: B
57)   

The parameter P in the second G76 line represents:

A.
B.
C.
D.
Answer: C
58)   

In threading, approach and overrun are required to:

A.
B.
C.
D.
Answer: B
59)   

Which unit is used in G76 for depth and feed parameters like P, Q?

A.
B.
C.
D.
Answer: D
60)   

To machine a thread M30 × 3.5, the final minor diameter is approx.:


A.
B.
C.
D.
Answer: A
61)   

To perform an internal groove, which type of tool is required?

A.
B.
C.
D.
Answer: B
62)   

Which CNC code is used for threading and should not be confused with grooving cycles?

A.
B.
C.
D.
Answer: B
63)   

In G75 U and W parameters are used for:

A.
B.
C.
D.
Answer: C
64)   

The advantage of using G73 over G71 in turning operations is:

A.
B.
C.
D.
Answer: C
65)   

Which of the following is not essential in a G71 cycle block?

A.
B.
C.
D.
Answer: C
66)   

In pattern repeat cycles, the main benefit is:

A.
B.
C.
D.
Answer: A
67)   

G70 cycle is used after roughing to:

A.
B.
C.
D.
Answer: B
68)   

Which axis is primarily used for defining contour in internal profile turning?

A.
B.
C.
D.
Answer: C
69)   

The primary benefit of using a pattern repeat cycle is:

A.
B.
C.
D.
Answer: C
70)   

Which thread system is typically used in fluid-tight pipe fittings in plumbing?

A.
B.
C.
D.
Answer: C
71)   

Which of the following is not true about multi-start threads?

A.
B.
C.
D.
Answer: D
72)   

In taper threading on a CNC lathe, constant taper angle is achieved by:

A.
B.
C.
D.
Answer: C
73)   

If tool overhang is too much during grooving:

A.
B.
C.
D.
Answer: C
74)   

The minor diameter of a thread is measured:

A.
B.
C.
D.
Answer: B
75)   

Threads are produced on CNC machines by:

A.
B.
C.
D.
Answer: C