1
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
A gear set has a pinion with $$20$$ teeth and a gear with $$40$$ teeth. The pinion runs at $$30rev/s$$ and transmits a power of $$20KW$$. The teeth are on the $${20^ \circ }$$ full-depth system and have a module of $$5mm.$$ The length of the line of action is $$19mm.$$

The resultant force on the contacting gear tooth is $$N$$ is

A
$$77.23$$
B
$$212.20$$
C
$$2258.1$$
D
$$289.43$$
2
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
A gear set has a pinion with $$20$$ teeth and a gear with $$40$$ teeth. The pinion runs at $$30rev/s$$ and transmits a power of $$20KW$$. The teeth are on the $${20^ \circ }$$ full-depth system and have a module of $$5mm.$$ The length of the line of action is $$19mm.$$

The contact ratio of the contacting tooth is

A
$$1.21$$
B
$$1.25$$
C
$$1.29$$
D
$$1.33$$
3
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
$$1000$$
4
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
$$0.785$$
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