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Machine Design

Machine Design
The ratio of endurance limit in shear to the endurance limit in flexure is

0.55
0.5
0.4
0.33

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Machine Design
The included angle in unified of American National threads is

55°
29°
60°
47°

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(4WD/ πd3) × K
(WD/ πd3) × K
(2WD/ πd3) × K
(8WD/ πd3) × K

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Machine Design
A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel.

Less than
Greater than
Equal to
None of these

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Machine Design
The gears are termed as medium velocity gears, if their peripheral velocity is

15-30 m/s
1-3 m/s
30-50 m/s
3-15 m/s

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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

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

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