1
GATE PI 2012
MCQ (Single Correct Answer)
+2
-0.6
In a shaping process, the number of double strokes per minute is $$30$$ and the quick return ratio is $$0.6,$$ If the length of the stroke is $$250mm,$$ the average cutting velocity in $$m/min$$ is
A
$$3.0$$
B
$$4.5$$
C
$$7.5$$
D
$$12.0$$
2
GATE PI 2012
MCQ (Single Correct Answer)
+2
-0.6
In a single pass drilling operation, a through hole of $$15$$ $$mm$$ diameter is to be drilled in a steel plate of $$50mm$$ thickness. Drill spindle speed is $$500epm,$$ feed is $$0.2mm/rev$$ and drill point angle is $${118^ \circ }.$$ Assuming $$2mm$$ clearance at approach and exit, the total drill time (in seconds) is
A
$$35.1$$
B
$$32.4$$
C
$$31.2$$
D
$$30.1$$
3
GATE PI 2011
MCQ (Single Correct Answer)
+2
-0.6
The number of defective produced by a six sigma process (in Parts per million) is
A
$$5.2$$
B
$$4.2$$
C
$$3.2$$
D
$$2.2$$
4
GATE PI 2011
MCQ (Single Correct Answer)
+2
-0.6
During orthogonal machining of a mild steel specimen with a cutting tool of zero rake angle, the following data is obtained:
Uncut chip thickness $$=0.25$$ $$mm$$
Chip thickness $$=0.75$$ $$mm$$
Width of cut $$=2.5$$ $$mm$$
Normal force $$=950$$ $$N$$
Thrust force $$=475$$ $$N$$

The shear angle and shear force, respectively, are

A
$${71.565^ \circ },\,\,150.12N$$
B
$${9.218^ \circ },\,\,861.64N$$
C
$${18.435^ \circ },\,\,751.04N$$
D
$${23.157^ \circ },\,\,686.66N$$
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