1
GATE PI 2014
MCQ (Single Correct Answer)
+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
$${{360g} \over {p\alpha }}x$$
2
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 _______________
Your input ____
3
GATE PI 2014
MCQ (Single Correct Answer)
+1
-0.3
A moving mandrel is used in
A
wire drawing
B
forging
C
tube drawing
D
bending
4
GATE PI 2014
MCQ (Single Correct Answer)
+1
-0.3
In an open die forging, a circular disc is gradually compressed between two flat plates. The exponential decay of normal stress on the flat face of the disc, from the center of the disc towards its periphery, indicates that
A
there is no sticking friction anywhere on the flat face of the disc.
B
sticking friction and sliding friction and sliding friction co-exist on the flat face of the disc
C
the flat face of the disc is friction-less
D
there is only sticking friction on the flat face of the disc.
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