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Machine Design

Machine Design
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

One-fourth
One-third
One-half
Double

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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

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

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Machine Design
The washer is generally specified by its

Thickness
Outer diameter
Hole diameter
Mean diameter

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

None of these
Half
Same
Double

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Machine Design
The shock resistance of steel is increased by adding

Chromium
Cobalt and molybdenum
Nickel and chromium
Nickel

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