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Machine Design

Machine Design
In a marine flange coupling, the pitch circle diameter of bolts is taken as

2.5 d
1.6 d
1.2 d
2 d

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

8W/9
2W/3
W/9
W/2

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

122°
136°
40°
152°

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Machine Design
In standard taper roller bearings, the angle of taper of outer raceway is

8°
15°
5°
25°

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Machine Design
A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is

2 kN-m
4 kN-m
1 kN-m
3 kN-m

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Machine Design
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

T₁ - T₂ + Tc
(T₁ - T₂ + Tc)/2
T₁ + T₂ + Tc
(T₁ + T₂ + Tc)/2

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