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

51)   

Rotation of a part program about a point is used to:

A.
B.
C.
D.
Answer: C
52)   

Which CNC function allows repeating a shape at multiple angular positions (like on rotary table)?

A.
B.
C.
D.
Answer: C
53)   

When you scale a shape by 0.5 using G51, the resulting part will be:

A.
B.
C.
D.
Answer: B
54)   

What is the usual file format used for CNC/VMC programs when exported?

A.
B.
C.
D.
Answer: B
55)   

What is DNC (Direct Numerical Control) in CNC programming?

A.
B.
C.
D.
Answer: C
56)   

Which of the following is a commonly used medium for importing/exporting CNC programs?

A.
B.
C.
D.
Answer: D
57)   

Before exporting a program from CNC machine to PC, you must:

A.
B.
C.
D.
Answer: B
58)   

While milling a hexagon using polar coordinates, how many angle steps are needed?

A.
B.
C.
D.
Answer: B
59)   

A tool moves radially outward at 60°, then returns and rotates 60° further — this sequence is repeated for:

A.
B.
C.
D.
Answer: C
60)   

Which CNC code is typically required before using G16 (polar mode)?

A.
B.
C.
D.
Answer: C
61)   

To mill a hexagon using G16, what must be programmed?

A.
B.
C.
D.
Answer: A
62)   

Setup time is included in cycle time calculation when

A.
B.
C.
D.
Answer: C
63)   

Which component does NOT directly affect cycle time?

A.
B.
C.
D.
Answer: B
64)   

In CNC machining, reducing feed rate will

A.
B.
C.
D.
Answer: B
65)   

What is the total cycle time for a part if:

  • Roughing time = 2.5 min
  • Finishing time = 1.0 min
  • Loading/unloading time = 0.5 min
A.
B.
C.
D.
Answer: B
66)   

The dry run helps in:

A.
B.
C.
D.
Answer: C
67)   

Which of the following should be disabled during dry run?

A.
B.
C.
D.
Answer: A
68)   

Which machine control button is usually pressed to activate dry run?

A.
B.
C.
D.
Answer: C
69)   

Which parameter compensates for variation in tool height?

A.
B.
C.
D.
Answer: C
70)   

In circular interpolation, which of the following defines center point using vector values?

A.
B.
C.
D.
Answer: C
71)   

For clockwise arc movement on the XY plane using I and J, the syntax is typically:

A.
B.
C.
D.
Answer: B
72)   

Which G-code is used to cancel circular interpolation mode?

A.
B.
C.
D.
Answer: D
73)   

In Incremental Programming (G91), the coordinates are measured from:

A.
B.
C.
D.
Answer: B
74)   

Which of the following represents a proper sequence in a simple G00/G01 part program?

A.
B.
C.
D.
Answer: B
75)   

How can an operator verify that G01 movement occurred correctly?

A.
B.
C.
D.
Answer: B