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Machine Design

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

136°
152°
122°
40°

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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
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

None of these
Equal to
Larger than
Smaller than

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Machine Design
The property of a material which enables it to resist fracture due to high impact loads is known as

Toughness
Endurance
Elasticity
Strength

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Machine Design
Gear box is used

To produce torque
For speed reduction
To obtain variable speeds
To increase efficiency of system

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Machine Design
The objective of caulking in a riveted joint is to make the joint

Stronger in tension
Free from stress
Leak-proof
Free from corrosion

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