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Machine Design

Machine Design
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

6
8
4
10

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Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ k₂)/ (k₁ + k₂)
(k₁ - k₂)/ (k₁ k₂)
(k₁ + k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ + k₂)

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Machine Design
Which of the following statement is correct, for two shafts connected in parallel?

Torque in each shaft is the same
Angle of twist of each shaft is the same
Shear stress in each shaft is the same
Torsional stiffness of each shaft is the same

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Machine Design
In designing thick cylinders, the equation used is

Birnie's equation
Lame's equation
All of these
Clavarinos' equation

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

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Machine Design
The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be

43869
44047
43929
44045

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