27 real CNC & Machining Practice questions from the Production & Plant bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What is G00 versus G01?
Junior
A.three locators on the primary face, two on the secondary and one on the tertiary restrain nine of twelve directional degrees of freedom before clamping
B.rapid traverse to a position at maximum speed versus straight-line cutting at the programmed feed rate
C.average flank wear land of 0.3 mm taken as end of tool life under ISO 3685, after which finish and dimensions drift
D.stored coordinate systems that place part zero relative to machine home, so one program runs on different fixtures
A.G00 versus G01 — three locators on the primary face, two on the secondary and one on the tertiary restrain nine of twelve directional degrees of freedom before clamping
B.G00 versus G01 — rapid traverse to a position at maximum speed versus straight-line cutting at the programmed feed rate
C.G00 versus G01 — M03 spindle clockwise, M05 spindle stop, M06 tool change, M08 coolant on and M30 program end with rewind
D.G00 versus G01 — circular interpolation clockwise and counter-clockwise, defined with an I, J, K centre offset or an R radius
A.G02 and G03 — stored coordinate systems that place part zero relative to machine home, so one program runs on different fixtures
B.G02 and G03 — three locators on the primary face, two on the secondary and one on the tertiary restrain nine of twelve directional degrees of freedom before clamping
C.G02 and G03 — circular interpolation clockwise and counter-clockwise, defined with an I, J, K centre offset or an R radius
D.G02 and G03 — average flank wear land of 0.3 mm taken as end of tool life under ISO 3685, after which finish and dimensions drift
A.rapid traverse to a position at maximum speed versus straight-line cutting at the programmed feed rate
B.three locators on the primary face, two on the secondary and one on the tertiary restrain nine of twelve directional degrees of freedom before clamping
C.plane-line-point sequence that establishes the part coordinate system on a probed component before any feature is measured
D.M03 spindle clockwise, M05 spindle stop, M06 tool change, M08 coolant on and M30 program end with rewind
A.three locators on the primary face, two on the secondary and one on the tertiary restrain nine of twelve directional degrees of freedom before clamping
B.circular interpolation clockwise and counter-clockwise, defined with an I, J, K centre offset or an R radius
C.stored coordinate systems that place part zero relative to machine home, so one program runs on different fixtures
D.self-excited vibration between tool and work that leaves a wavy surface, cured by changing spindle speed per the stability lobe diagram or reducing overhang
A.Work offsets G54–G59 — stored coordinate systems that place part zero relative to machine home, so one program runs on different fixtures
B.Work offsets G54–G59 — plane-line-point sequence that establishes the part coordinate system on a probed component before any feature is measured
C.Work offsets G54–G59 — M03 spindle clockwise, M05 spindle stop, M06 tool change, M08 coolant on and M30 program end with rewind
D.Work offsets G54–G59 — self-excited vibration between tool and work that leaves a wavy surface, cured by changing spindle speed per the stability lobe diagram or reducing overhang
A.G41 left or G42 right offset that lets the program follow the part profile while tool wear is corrected in the offset table
B.circular interpolation clockwise and counter-clockwise, defined with an I, J, K centre offset or an R radius
C.stored coordinate systems that place part zero relative to machine home, so one program runs on different fixtures
D.three locators on the primary face, two on the secondary and one on the tertiary restrain nine of twelve directional degrees of freedom before clamping
A.Cutter radius compensation — M03 spindle clockwise, M05 spindle stop, M06 tool change, M08 coolant on and M30 program end with rewind
B.Cutter radius compensation — plane-line-point sequence that establishes the part coordinate system on a probed component before any feature is measured
C.Cutter radius compensation — circular interpolation clockwise and counter-clockwise, defined with an I, J, K centre offset or an R radius
D.Cutter radius compensation — G41 left or G42 right offset that lets the program follow the part profile while tool wear is corrected in the offset table
A.stored coordinate systems that place part zero relative to machine home, so one program runs on different fixtures
B.three locators on the primary face, two on the secondary and one on the tertiary restrain nine of twelve directional degrees of freedom before clamping
C.G41 left or G42 right offset that lets the program follow the part profile while tool wear is corrected in the offset table
D.plane-line-point sequence that establishes the part coordinate system on a probed component before any feature is measured
20. Which term means: "three locators on the primary face, two on the secondary and one on the tertiary restrain nine of twelve directional degrees of freedom before clamping"?
A.3-2-1 locating principle — M03 spindle clockwise, M05 spindle stop, M06 tool change, M08 coolant on and M30 program end with rewind
B.3-2-1 locating principle — three locators on the primary face, two on the secondary and one on the tertiary restrain nine of twelve directional degrees of freedom before clamping
C.3-2-1 locating principle — G41 left or G42 right offset that lets the program follow the part profile while tool wear is corrected in the offset table
D.3-2-1 locating principle — circular interpolation clockwise and counter-clockwise, defined with an I, J, K centre offset or an R radius
A.average flank wear land of 0.3 mm taken as end of tool life under ISO 3685, after which finish and dimensions drift
B.plane-line-point sequence that establishes the part coordinate system on a probed component before any feature is measured
C.G41 left or G42 right offset that lets the program follow the part profile while tool wear is corrected in the offset table
D.self-excited vibration between tool and work that leaves a wavy surface, cured by changing spindle speed per the stability lobe diagram or reducing overhang
A.CMM datum alignment — plane-line-point sequence that establishes the part coordinate system on a probed component before any feature is measured
B.CMM datum alignment — self-excited vibration between tool and work that leaves a wavy surface, cured by changing spindle speed per the stability lobe diagram or reducing overhang
C.CMM datum alignment — rapid traverse to a position at maximum speed versus straight-line cutting at the programmed feed rate
D.CMM datum alignment — three locators on the primary face, two on the secondary and one on the tertiary restrain nine of twelve directional degrees of freedom before clamping
A.self-excited vibration between tool and work that leaves a wavy surface, cured by changing spindle speed per the stability lobe diagram or reducing overhang
B.M03 spindle clockwise, M05 spindle stop, M06 tool change, M08 coolant on and M30 program end with rewind
C.plane-line-point sequence that establishes the part coordinate system on a probed component before any feature is measured
D.stored coordinate systems that place part zero relative to machine home, so one program runs on different fixtures
26. Which term means: "self-excited vibration between tool and work that leaves a wavy surface, cured by changing spindle speed per the stability lobe diagram or reducing overhang"?
A.Chatter — plane-line-point sequence that establishes the part coordinate system on a probed component before any feature is measured
B.Chatter — rapid traverse to a position at maximum speed versus straight-line cutting at the programmed feed rate
C.Chatter — G41 left or G42 right offset that lets the program follow the part profile while tool wear is corrected in the offset table
D.Chatter — self-excited vibration between tool and work that leaves a wavy surface, cured by changing spindle speed per the stability lobe diagram or reducing overhang
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