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Machine Design

Machine Design
A cotter joint is used to connect two __________ rods.

Parallel
Perpendicular
Co-axial
None of these

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Machine Design
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

138 d
124 d
168 d
151 d

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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

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

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Machine Design
The lower deviation is the algebraic difference between the

Actual size and the corresponding basic size
None of these
Maximum limit and the basic size
Minimum limit and the basic size

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Machine Design
If two springs are in parallel then their overall stiffness will be

Half
None of these
Same
Double

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Machine Design
The notch angle of the Izod impact test specimen is

20°
45°
10°
30°

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