1
GATE PI 2008
+2
-0.6
In a $$CNC$$ feed drive, a stepper motor with step angle of $$1.8deg$$ drives a lead screw with pitch of $$2mm.$$ The basic length unit $$(BLU)$$ for this drive is
A
$$10$$ microns
B
$$20$$ microns
C
$$40$$ microns
D
$$100$$ microns
2
GATE PI 2008
+2
-0.6
By application of tensile force, the cross sectional area of bar $$' P '$$ is first reduced by $$30\%$$ and then by an additional $$20\%$$. Another bar $$'Q'$$ of the same material is reduced in cross sectional area by $$50\%$$ in a single step by applying tensile force. After deformation, the true strain in bar $$'P'$$ and bar $$'Q'$$ will, respectively, be
A
$$0.5$$ and $$0.5$$
B
$$0.58$$ and $$0.69$$
C
$$0.69$$ and $$0.69$$
D
$$0.78$$ and $$1.00$$
3
GATE PI 2008
+2
-0.6
A $$10mm$$ diameter annealed steel wire is drawn through a die at a speed of $$0.5/sec$$ to reduce the diameter by $$20\%$$. The yield stress of the material is $$800MPa.$$

The power required for the drawing process (in $$kW$$ ) is

A
$$8.97$$
B
$$14.0$$
C
$$17.95$$
D
$$28.0$$
4
GATE PI 2008
+2
-0.6
In a rolling process, thickness of a strip is reduced from $$4mm$$ to $$3mm$$ using $$300mm$$ diameter rolls rotating at $$100rpm.$$ The velocity of the strip (in $$m/sec$$) at the neutral point is
A
$$1.57$$
B
$$3.14$$
C
$$47.10$$
D
$$94.20$$
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