1
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
A ball bearing operating at a load $$F$$ has $$8000$$hours of life. The life of the bearing, in hours, when the load is doubled to $$2F$$ is
A
$$8000$$
B
$$6000$$
C
$$4000$$
D
$$1000$$
2
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
A natural feed journal bearing of diameter $$50mm$$ and length $$50mm$$ operating at $$20$$ revolutions/sec carries a load of $$2kN$$. The lubricant used has a viscosity of $$20mPa$$-$$s$$. The radial clearance is $$50\mu m.$$ The Sommerfeld number for the bearings is
A
$$0.062$$
B
$$0.125$$
C
$$0.250$$
D
$$0.785$$
3
GATE ME 2000
MCQ (Single Correct Answer)
+2
-0.6
The life of a ball bearing at a load of $$10$$ $$kN$$ is $$8000$$ hours. Its life in hours, if the load is increased to $$20$$ $$kN,$$ keeping all other conditions same, is
A
$$4000$$
B
$$2000$$
C
$$1000$$
D
$$500$$
4
GATE ME 1997
Subjective
+2
-0
Match the following
List - $${\rm I}$$
(a)$$\,\,\,\,\,$$ Automobile wheel mounting on axle
(b)$$\,\,\,\,\,$$ High speed grinding spindle
(c)$$\,\,\,\,\,$$ $${\rm IC}$$ - Engine connecting rod
(d)$$\,\,\,\,\,$$ Leaf spring eye mounting

List - $${\rm II}$$
1.$$\,\,\,\,\,$$ Magneto bearing
2.$$\,\,\,\,\,$$ Angular contact bearing
3.$$\,\,\,\,\,$$ Taper roller bearing
4.$$\,\,\,\,\,$$ Hydrodynamic journal bearing
5.$$\,\,\,\,\,$$ Sintered metal bearing
6.$$\,\,\,\,\,$$ Teflon/Nylon bush

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Turbo Machinery
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