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Machine Design

Machine Design
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

14
18
24
12

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

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Machine Design
The included angle for the British standard whitworth thread is

55°
47.5°
60°
29°

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Machine Design
In Vickers hardness testing, the pyramid indentor apex is

136°
40°
122°
152°

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Machine Design
A connecting rod is designed as a

Strut
All of these
Long column
Short column

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Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

80 to 90%
45 to 60%
70 to 83%
63 to 70%

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