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Machine Design

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

152°
40°
136°
122°

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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)

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

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Machine Design
The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 + v).

15 m/s
20 m/s
12.5 m/s
10 m/s

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Machine Design
The yield point in static loading is __________ as compared to fatigue loading.

Lower
None of these
Higher
Same

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Machine Design
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

3/ (3 + v)
6/ (6 + v)
4.5/ (4.5 + v)
0.75/ (0.75 + √v)

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Machine Design
Which of the following statement is correct, for two shafts connected in parallel?

Angle of twist of each shaft is the same
Shear stress in each shaft is the same
Torque in each shaft is the same
Torsional stiffness of each shaft is the same

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