1
GATE PI 2014
+1
-0.3
In an open loop, point-to-point controlled $$CN$$ drilling machine, a stepper motor, producing $$200$$ angular steps per revolution drives the table of a drilling machine by one angular step per each pulse generated by a pulse generator (shown in figure). Each angular step moves the table by one Basic Length Unit $$(BLU)$$ along $$X$$ axis with a lead screw having a pitch of $$4mm.$$ If the frequency of pulse generator is doubled, the $$BLU$$ will
A
become double of previous value
B
become half of previous value
C
remain the same
D
became zero
2
GATE PI 2014
+2
-0.6
Each axis of $$NC$$ machine is driven by a stepper motor drive with a lead screw. The pitch of lead screw is $$p$$ $$mm.$$ The step angle of stepper motor per pulse input is $$\alpha$$ degrees/pulse. The ratio of gear drive in stepper motor drive is $$g$$(number of turns of the motor for each single turn of the lead screw). The number of pulses required to achieve a linear movement of $$x$$ $$mm$$ is
A
$${{\alpha g} \over {360p}}x$$
B
$${{360g} \over p}x$$
C
$${g \over {360p}}x$$
D
$${{360g} \over {p\alpha }}x$$
3
GATE PI 2014
Numerical
+2
-0
A $$CNC$$ instruction $$G91\,\,\,G01\,\,\,X30\,\,\,Y40\,\,\,F100$$ commands the movement of tool along the path at a feed rate of $$100mm/min$$ $$(G91$$-incremental format and $$G01$$-linear interpolation). The feed rate of the tool (in $$mm/min)$$ along the $$X$$ axis will be _______________
4
GATE PI 2014
+1
-0.3
A moving mandrel is used in
A
wire drawing
B
forging
C
tube drawing
D
bending
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