1
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
A displacement sensor (a dial indicator) measures the lateral displacement of a mandrel on the taper hole inside a drill spindle. The mandrel axis is an extension of the drill spindle taper hole axis and the protruding portion of the mandrel surface is perfectly cylindrical. Measurement are recorded as $${R_x} = $$ maximum deflection minus minimum deflection, corresponding to sensor position at $$X$$, over one rotation. GATE ME 2008 Production Engineering - Metrology and Inspection Question 13 English

If $${R_p} = {R_Q} > 0,$$ which one of the following would be consistent with the observation?

A
The drill spindle rotational axis is coincident with the drill spindle taper hole axis
B
The drill spindle rotational axis intersects the drill spindle taper hole axis at point $$P$$
C
The drill spindle rotational axis is parallel to the drill spindle taper hole axis
D
The drill spindle rotational axis intersects the drill spindle taper hole axis at point $$Q$$
2
GATE ME 2008
MCQ (Single Correct Answer)
+1
-0.3
For generating coon's surface we require
A
a set of grid points on the surface
B
a set of grid control points
C
four bounding curves defining the surface
D
two bounding curves and a set of grid control points
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. GATE ME 2008 Production Engineering - Advance Machine Tools Question 9 English

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. GATE ME 2008 Production Engineering - Advance Machine Tools Question 8 English

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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