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MCQ - Mechanical TNPSC JTO
JTO - 534 - Advanced Computer Numerical Control - 534 - Unit VIII VMC G Code

1)   

Which axis is typically vertical in a VMC machine?

A.
B.
C.
D.
Answer: C
2)   

The main advantage of VMC over conventional milling machine is:

A.
B.
C.
D.
Answer: C
3)   

What is the function of the ATC (Automatic Tool Changer) in VMC?

A.
B.
C.
D.
Answer: C
4)   

Which axis in a VMC represents the front-to-back movement of the table?

A.
B.
C.
D.
Answer: C
5)   

The direction of the Z-axis in VMC is defined as:

A.
B.
C.
D.
Answer: B
6)   

What does the G17 command represent in CNC programming for VMC?

A.
B.
C.
D.
Answer: A
7)   

The unit of feed rate in CNC machining is generally:

A.
B.
C.
D.
Answer: B
8)   

Depth of cut refers to:

A.
B.
C.
D.
Answer: B
9)   

If the spindle speed (N) increases and tool diameter remains constant, what happens to the cutting speed (V)?

A.
B.
C.
D.
Answer: C
10)   

Tool wear can be detected by observing

A.
B.
C.
D.
Answer: C
11)   

Which type of wear occurs at the tool tip due to rubbing action with the workpiece?

A.
B.
C.
D.
Answer: B
12)   

Which code is used to call a specific tool in CNC programming?

A.
B.
C.
D.
Answer: B
13)   

The tool change is initiated in CNC using which M-code?

A.
B.
C.
D.
Answer: A
14)   

Tool wear affects which of the following most?

A.
B.
C.
D.
Answer: C
15)   

Tool offset in CNC refers to:

A.
B.
C.
D.
Answer: C
16)   

Which offset is used to compensate tool length variation in VMC?

A.
B.
C.
D.
Answer: C
17)   

What is meant by “over travel” in a CNC or VMC machine?

A.
B.
C.
D.
Answer: B
18)   

Over travel protection in VMC is provided by:

A.
B.
C.
D.
Answer: B
19)   

What happens when a machine hits an over travel limit?

A.
B.
C.
D.
Answer: C
20)   

The emergency stop is classified under which category of safety device?

A.
B.
C.
D.
Answer: C
21)   

When the emergency stop button is pressed, the machine:

A.
B.
C.
D.
Answer: C
22)   

What happens to the CNC program after pressing the emergency stop button?

A.
B.
C.
D.
Answer: C
23)   

Where is the Emergency Stop button typically located on a VMC?

A.
B.
C.
D.
Answer: C
24)   

What is the function of MDI (Manual Data Input) mode in a VMC?

A.
B.
C.
D.
Answer: B
25)   

The AUTO mode is used to:

A.
B.
C.
D.
Answer: B