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MCQ - Mechanical TNPSC JTO
JTO - 534 - Advanced Computer Numerical Control - 534 - Unit VII Routine Maintenance

51)   

Excessive vibration during CNC lathe operation can be due to:

A.
B.
C.
D.
Answer: C
52)   

What does a regularly blinking spindle drive alarm indicate in a CNC lathe?

A.
B.
C.
D.
Answer: C
53)   

What is the function of the machine’s automatic lubrication system?

A.
B.
C.
D.
Answer: C
54)   

What is the common cause for inaccurate part dimension after multiple cuts?

A.
B.
C.
D.
Answer: C
55)   

Why is the air blast system important in CNC VMC spindle nose?

A.
B.
C.
D.
Answer: B
56)   

Which of the following must be checked while inspecting ATC in a VMC?

A.
B.
C.
D.
Answer: C
57)   

In CNC VMC, excessive Z-axis backlash will cause

A.
B.
C.
D.
Answer: C
58)   

What does a CNC machine alarm for “Emergency Stop” typically indicate?

A.
B.
C.
D.
Answer: D
59)   

Which of the following is NOT part of a CNC VMC’s preventive maintenance schedule?

A.
B.
C.
D.
Answer: C
60)   

OEM-specified spindle warm-up programs are most important during:

A.
B.
C.
D.
Answer: B
61)   

OEM suggests tool change cycle testing to identify:

A.
B.
C.
D.
Answer: C
62)   

OEM battery backup ensures:

A.
B.
C.
D.
Answer: C
63)   

Which of the following is not part of OEM routine maintenance for VMC?

A.
B.
C.
D.
Answer: D
64)   

OEM recommends using an earth leakage circuit breaker (ELCB) for:

A.
B.
C.
D.
Answer: C
65)   

OEM provides exact replacement intervals for:

A.
B.
C.
D.
Answer: B
66)   

One reason OEM insists on proper cable dressing and protection is to avoid:

A.
B.
C.
D.
Answer: B
67)   

OEM maintenance logbooks are helpful for:

A.
B.
C.
D.
Answer: B
68)   

As per OEM, scheduled downtime for maintenance is

A.
B.
C.
D.
Answer: B
69)   

Why should OEM-trained technicians be used for critical maintenance?

A.
B.
C.
D.
Answer: C
70)   

The turret indexing on a CNC lathe is not happening. What should be checked first?

A.
B.
C.
D.
Answer: C
71)   

The life of a CNC machine is increased by:

A.
B.
C.
D.
Answer: C
72)   

Improper chip removal from a CNC lathe bed can cause:

A.
B.
C.
D.
Answer: B
73)   

In CNC lathe machines, the tailstock needs maintenance mainly to:

A.
B.
C.
D.
Answer: C
74)   

What does a low-level alarm in lubrication system indicate?

A.
B.
C.
D.
Answer: B
75)   

The VMC tool magazine fails to rotate. Which system should be checked first?

A.
B.
C.
D.
Answer: B