Machine Design
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

10 times
5 times
15 times
20 times

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Machine Design
The designation M 33 × 2 of a bolt means

Metric threads of 33 mm outside diameter and 2 mm pitch
Bolt of 33 mm nominal diameter having 2 threads per cm
Metric threads of 33 numbers in 2 cm
Metric threads with cross-section of 33 mm

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

New and old belts will cause vibrations
The new belt will carry more than its share and result in short life
Only one belt cannot be fitted with other used belts
Belts are available in sets

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Machine Design
Which is correct statement? Stress concentration in static loading is

Very serious in ductile materials and less serious in brittle materials
Seriousness would depend on other factors
Very serious in brittle materials and less serious in ductile materials
Equally serious in both types of materials

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