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Machine Design

Machine Design
Fibrous fracture occurs in

Brittle material
Hard material
Elastic material
Ductile material

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Machine Design
A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

2136 N-m
2000 N-m
2100 N-m
2050 N-m

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Machine Design
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)

0.175 - (0.841/T)
0.124 - (0.684/T)
0.154 - (0.912/T)
None of these

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Machine Design
According to Indian standard specifications, a Grey cast iron designated by 'FG 200' means that the

Minimum tensile strength is 200 N/mm²
Maximum compressive strength is 200 N/mm²
Maximum shear strength is 200 N/mm²
Carbon content is 2%

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Machine Design
For hardening alloy steels and high speed steels, they are heated to

500 to 600°C
1100 to 1300°C
700 to 900°C
1300 to 1500°C

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Machine Design
In order to remove internal stresses produced by hardening the steel, the process usually adopted is

Normalizing
Annealing
Tempering
Spheroidizing

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