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Machine Design

Machine Design
The cross-section of the arm of a bell crank lever is

Rectangular
Any one of these
Elliptical
I-section

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Machine Design
When the fulcrum is in between the load and effort, the lever is said to be of

Any one of these
Second type
Third type
First type

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Machine Design
Which process will increase the fatigue duration of parts?

Shot-peening
Finishing and polishing
De-carburisation
Electroplating

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

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Machine Design
Factor of safety for fatigue loading is the ratio of

Young's modulus to the ultimate tensile strength
Endurance limit to the working stress
Elastic limit to the yield point
Elastic limit to the working stress

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Machine Design
When the belt is transmitting maximum power, the belt speed should be (Where, m = mass of belt per meter (kg/m) and Pmax = maximum permissible tension in belt (N))

√(Pmax / 2m)
√(Pmax / m)
√(Pmax / 3m)
√(3m /Pmax)

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