1
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
$$0.785$$
2
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
$$500$$
3
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

4
GATE ME 1997
MCQ (Single Correct Answer)
+2
-0.6
The dynamic load capacity of $$6306$$ bearing is $$22KN.$$ The maximum radial load it can sustain to operate at $$600$$ $$rev/min,$$ for $$2000$$ hours is
A
$$4.16$$ $$kN$$
B
$$3.60$$ $$kN$$
C
$$6.25$$ $$kN$$
D
$$5.29$$ $$kN$$
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Turbo Machinery
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