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Machine Design

Machine Design
The number of slots in a 25 mm castle nut is

2
6
8
4

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Machine Design
If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as

T sec²φ
T cosecφ
T/sec³φ
T sec³φ

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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

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

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Machine Design
In the assembly of pulley, key and shaft

All the three are designed for equal strength
Pulley is made the weakest
Key is made the weakest
Key is made the strongest

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Machine Design
A machine part subjected to _________ is called a strut.

An axial tensile force
An axial compressive force
A tangential force
Any one of these

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Machine Design
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

One-fourth
Double
One-half
One-eighth

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