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WorksheetsDesign of Machine Elements
Total questions: 15
Worksheet time: 8mins
The helix angle for double helical gears may be made up to...........
75*
60*
45*
90*
Flywheels are used in punching and shear operation.
False
True
The steel widely used for motor car crankshafts is.....
Nickel steel
High speed steel
Nickel chrome steel
Chrome steel
A column of length L is fixed at both ends. The equivalent length of the column is....
L
L/3
L/2
3L
The notch sensitivity q is expressed in terms of fatigue stress concentration factor 'Kf' and theoretical stress concentration factor 'Kt' as ...
(Kf + 1) / (Kt + 1)
(Kf - 1) / (Kt - 1)
(Kt + 1) / (Kf + 1)
(Kt - 1) / (Kf - 1)
If the centre distance of the mating gears having involute teeth is varied limits the velocity ratio...
Increases
Decreases
Remains unchanged
None of these
Guest's theory is used for....
Brittle materials
Ductile materials
Elastic materials
Plastic materials
Rankine Gordon formula for buckling is valid for...
Short and long column
Long column
Short column
very long column
In the levers of third type, the mechanical advantage is ________ one.
Equal to
More than
Less than
None of these
A screw will be self locking, if....
Friction angle is less than helix angle
Friction angle is more than helix angle
Friction angle is equal to helix angle
Efficiency of screw is 100%
Surface endurance limit of gear material is dependent upon its...
Elastic strength
Yield strength
Toughness
Brinell hardness number
The size of a gear is usually specified by...
Pressure angle
Pitch circle diameter
circular pitch
Diametral pitch
In Vickers hardness testing, the pyramid indentor apex is...
40*
122*
136*
152*
The number of slots in a 25mm castle nut is
6
8
4
2
In nitrated parts, the origins of the fatigue cracks will occur at..
Surface
Just below the surface
Within the core
None of the above
