1
GATE ME 2008
+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
2
GATE ME 2008
+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 $$2f$$
3
GATE ME 2005
+2
-0.6
The tool of an $$NC$$ machine has to move along a circular arc from $$(5,5)$$ to $$(10,10)$$ while performing an operation. The center of the arc is at $$(10,5).$$ Which one of the following $$NC$$ tool path commands performs the above mentioned operation?
A
$$N010\,\,\,\,G02\,\,\,\,X10\,\,\,\,Y10\,\,\,\,X5\,\,\,\,Y5\,\,\,\,R5$$
B
$$N010\,\,\,\,G03\,\,\,\,X10\,\,\,\,Y10\,\,\,\,X5\,\,\,\,Y5\,\,\,\,R5$$
C
$$N010\,\,\,\,G01\,\,\,\,X5\,\,\,\,Y5\,\,\,\,X10\,\,\,\,Y10\,\,\,\,R5$$
D
$$N010\,\,\,\,G02\,\,\,\,X5\,\,\,\,Y5\,\,\,\,X10\,\,\,\,Y10\,\,\,\,R5$$
4
GATE ME 2005
+2
-0.6
Which among the $$NC$$ operations given below are continuous path operations? Arc Welding $$(A$$ $$W)$$, Milling $$(M),$$ Drilling $$(D),$$ Punching in Sheet Metal $$(P)$$ Laser Cutting of Sheet Metal $$(LC),$$ Spot Welding $$(SW).$$
A
$$AW,LC$$ and $$M$$
B
$$AW,D,LC$$ and $$M$$
C
$$D,LC, P$$ and $$SW$$
D
$$D, LC,$$ and $$SW$$
GATE ME Subjects
EXAM MAP
Medical
NEET