1
GATE ME 2010
MCQ (Single Correct Answer)
+2
-0.6
In a $$CNC$$ program block, $$N002\,\,\,\,G02\,\,\,\,G91\,\,\,\,X40\,\,\,\,Z40....,\,\,\,\,G02\,\,\,\,\& \,\,\,\,G91$$ refer to
A
Circular interpolation in counterclockwise direction and incremental dimension
B
Circular interpolation in counterclockwise direction and absolute dimension
C
Circular interpolation in clockwise direction and incremental dimension
D
Circular interpolation in clockwise direction and absolute dimension
2
GATE ME 2009
MCQ (Single Correct Answer)
+2
-0.6
Match the following
A
$$P - 2,\,\,Q - 3,\,\,R - 4,\,\,S - 1$$
B
$$P - 3,\,\,Q - 4,\,\,R - 1,\,\,S - 2$$
C
$$P - 3,\,\,Q - 4,\,\,R - 2,\,\,S - 1$$
D
$$P - 4,\,\,Q - 3,\,\,R - 2,\,\,S - 1$$
3
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
In the feed drive of a point to point open loop $$CNC$$ drive, a stepper motor rotating at $$200steps/rev$$ drives a table through a gear box and lead screw-nut mechanism (pitch $$=4mm,$$ number of starts $$=1$$). The gear ratio $$=$$ Output speed / input speed is given by $$U=1/4.$$ The stepper motor (driven by voltage pulses from a pulse generator) executes $$1$$ step / pulse from a pulse generator) executes $$1$$ step / pulse of the generator. The frequency of the pulse train from the pulse generator is $$f=10000$$ pulses per minute.

The basic length unit $$(BLU)$$, i.e. the table movement corresponding to $$1$$ pulse of the pulse generator

A
$$0.5$$ microns
B
$$5$$ Microns
C
$$50$$ Microns
D
$$500$$ Microns
4
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
In the feed drive of a point to point open loop $$CNC$$ drive, a stepper motor rotating at $$200steps/rev$$ drives a table through a gear box and lead screw-nut mechanism (pitch $$=4mm,$$ number of starts $$=1$$). The gear ratio $$=$$ Output speed / input speed is given by $$U=1/4.$$ The stepper motor (driven by voltage pulses from a pulse generator) executes $$1$$ step / pulse from a pulse generator) executes $$1$$ step / pulse of the generator. The frequency of the pulse train from the pulse generator is $$f=10000$$ pulses per minute.

A customer insists on a modification to change the $$BLU$$ of the $$CNC$$ drive to $$10$$ Microns without changing the table speed. The modification can be accomplished by

A
Changing $$U$$ to $${\raise0.5ex\hbox{\scriptstyle 1} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{\scriptstyle 2}}$$ and reducing $$f$$ to $$f/2$$
B
Changing $$U$$ to $$1/8$$ and increasing $$f$$ to $$2f$$
C
Changing $$U$$ to $${\raise0.5ex\hbox{\scriptstyle 1} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{\scriptstyle 2}}$$ and keeping $$f$$ unchanged
D
Keeping $$U$$ unchanged and increasing $$f$$ to $$2f$$
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