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Machine Design

Machine Design
The helix angle for single helical gears ranges from

15° to 20°
35° to 50°
20° to 35°
10° to 15°

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Machine Design
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

Reduce vibration
Reduce slip
Ensure uniform loading
Ensure proper alignment

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Machine Design
In leaf springs, the longest leaf is known as

Upper leaf
Lower leaf
None of these
Master leaf

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Machine Design
In radial bearings, the load acts __________ to the axis of rotation.

Perpendicular
None of these
Parallel
Both A and B

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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

2000 N-m
2100 N-m
2050 N-m
2136 N-m

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Machine Design
The shear plane in case of bolts should

Be across threaded portion of shank
Never be across the threaded portion
Be parallel to axis of bolt
Be normal to threaded portion of shank

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