1
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
2
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 $$2f$$
3
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
A two dimensional fluid element rotates like a rigid body. At a point within the element, the pressure is $$1$$ unit. Radius of the Mohr's circle, characterizing the state at that point, is
A
0.5 unit
B
0 unit
C
1 unit
D
2 unit
4
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
A solid circular shaft of diameter 100 mm is subjected to an axial stress of 50 MPa. It further subjected to a torque of 10 KN-m. The maximum principal stress experienced on the shaft is closest to
A
41 MPa
B
82 MPa
C
164 MPa
D
204 MPa
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