1
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
A spur gate has a module of $$3mm,$$ number of teeth $$16,$$ a face width of $$36mm$$ and a pressure angle of $${20^ \circ }$$. It is transmitting a power of $$3KW$$ at $$20rev/s.$$ Taking a velocity factor of $$1.5$$ and a form factor of $$0.3,$$ the stress in the gear tooth is about
A
$$32MPa$$
B
$$46MPa$$
C
$$58MPa$$
D
$$70MPa$$
2
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
Match the type of gears with their most appropriate description

Type of gear
(P)$$\,\,\,\,\,$$ Helical
(Q)$$\,\,\,\,\,$$ Spiral Bevel
(R)$$\,\,\,\,\,$$ Hypoid
(S)$$\,\,\,\,\,$$ Rack and pinion

Description
1.$$\,\,\,\,\,$$ Axes non parallel a and non intersecting
2$$\,\,\,\,\,$$. Axes parallel and teeth are inclined to the axis
3.$$\,\,\,\,\,$$ Axes parallel and teeth are parallel to the axis
4.$$\,\,\,\,\,$$ Axes are perpendicular and intersecting and teeth are inclined to the axis
5.$$\,\,\,\,\,$$ Axes are perpendicular and used for large speed reduction
6.$$\,\,\,\,\,$$ Axes parallel and one of the gears has infinite radius

A
$$P - 2,\,Q - 4,\,R - 1,\,S - 6$$
B
$$P - 1,\,Q - 4,\,R - 5,\,S - 6$$
C
$$P - 2,\,Q - 6,\,R - 4,\,S - 2$$
D
$$P - 6,\,Q - 3,\,R - 1,\,S - 5$$
3
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
A journal bearing has a shaft diameter of $$40mm$$ and a length of $$40mm.$$ The shaft is rotating at $$20$$ $$rad/s$$ and viscocity of the lubricant is $$20mPa.s.$$ The clearance is $$0.020mm.$$ The loss of the torque due to viscocity of the lubricant is approximately
A
$$0.040$$ $$Nm$$
B
$$0.252$$ $$Nm$$
C
$$0.400$$ $$Nm$$
D
$$0.652$$ $$Nm$$
4
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
One tooth of gear having $$4$$ module and $$32$$ teeth is shown in the figure. Assume that the gear tooth and the corresponding tooth space make equal intercepts on the pitch circumference. GATE ME 2008 Machine Design - Design of Spur Gears Question 1 English

The dimensions $$' a '$$ and $$' b '$$ respectively, are closest to

A
$$6.08$$ $$mm,$$ $$4$$ $$mm$$
B
$$6.48$$ $$mm,$$ $$4.2$$ $$mm$$
C
$$6.28$$ $$mm,$$ $$4.3$$ $$mm$$
D
$$6.28$$ $$mm,$$ $$4.1$$ $$mm$$
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