1
GATE PI 2008
+2
-0.6
The quick return mechanism used in shaper has rocker arm drive of length $$200mm.$$ If the crank radius is $$50mm$$ and the offset between crank center and rocker arm pivot is $$20mm,$$ length of the stroke (in meters) is
A
$$0.5$$
B
$$1.0$$
C
$$1.5$$
D
$$2.0$$
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 $$120.$$

Machining time (in min) per hole will be

A
$$0.08$$
B
$$0.31$$
C
$$0.44$$
D
$$0.86$$
3
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
$$490$$
4
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
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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