1
GATE PI 2007
+2
-0.6
Blind hole $$10mm$$ diameter, $$50mm$$ deep are being drilled in steel block, drilling spindle speed is $$600rpm$$, feed $$0.2$$$$mm/rev,$$ point angle of drill is $$120.$$

Machining time (in min) per hole will be

A
$$0.08$$
B
$$0.31$$
C
$$0.44$$
D
$$0.86$$
2
GATE PI 2007
+2
-0.6
Blind hole $$10mm$$ diameter, $$50mm$$ deep are being drilled in steel block, drilling spindle speed is $$600rpm$$, feed $$0.2$$$$mm/rev,$$ point angle of drill is $$120.$$

During the above operation, the drill wears out after producing $$200$$ holes. Taylor's tool life equation is of the form $$V{T^{0.3}} = C,$$ where $$V=$$ cutting speed in $$m/min$$ and $$T=$$ tool life in $$min.$$ Taylor's constant $$C$$ will be

A
$$15$$
B
$$72$$
C
$$93$$
D
$$490$$
3
GATE PI 2005
+2
-0.6
One brand of milling machine has the following two index plates supplied along with the indexing head:
Plate 1: $$15, 16, 17, 18, 19, 20$$ hole circles.
Plate 2: $$21, 23, 27, 29, 31, 33$$ hole circles.

It is proposed to mill a spur gear of $$28$$ teeth using simple indexing method. Which one of the following combinations of index plate and number of revolutions is correct?

A
Plate $$1:1$$ revolution and $$9$$ holes in $$18$$ hole circles
B
Plate $$2:1$$ revolution and $$9$$ holes in $$21$$ hole circles
C
Plate $$2:1$$ revolution and $$9$$ holes in $$33$$ hole circles
D
Plate $$1:1$$ revolution and $$9$$ holes in $$15$$ hole circles
4
GATE PI 2005
+2
-0.6
Match List - $${\rm I}$$ (Milling problem) with List - $${\rm I}$$$${\rm I}$$ (Probable causes) and select the correct answer using the codes given below the lists:
A
$$A - 2,\,\,B - 1,\,\,C - 5,\,\,D - 3$$
B
$$A - 2,\,\,B - 1,\,\,C - 3,\,\,D - 5$$
C
$$A - 4,\,\,B - 5,\,\,C - 2,\,\,D - 3$$
D
$$A - 4,\,\,B - 2,\,\,C - 3,\,\,D - 5$$
GATE PI Subjects
Fluid Mechanics
Metrology
Theory of Machines
Machine Tools and Machining
Industrial Engineering
Engineering Mechanics
Thermodynamics
Machine Design
Casting
Joining of Materials
Metal Forming
EXAM MAP
Medical
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