Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Shot peening
Cold working
Grinding and lapping surface
Hot working

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Machine Design
The elasticity is the property of a material which enables it to

Regains its original shape after deformation when the external forces are removed
Retain deformation produced under load permanently
Resists fracture due to high impact loads
Draw into wires by the application of a tensile force

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

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

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