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Machine Design

Machine Design
According to Indian standards, total numbers of tolerance grades are

8
20
18
12

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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

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

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

Less than
Equal to
None of these
Greater than

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Machine Design
The size of a cam depends upon

Pitch curve
Prime circle
Base circle
Pitch circle

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Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

12 kN/m
6 kN/m
24 kN/m
30 kN/m

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Machine Design
The form factor of a helical gear __________ with the increase in the helix angle.

Decreases
None of these
Remains constant
Increases

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