Machine Design
The value of Lewis form factor used in design of gears is

Dependent on number of teeth of a gear
All of these
Dependent on system of teeth
Independent of size of teeth

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Machine Design
A woodruff key is

All of these
Fitted in pairs at right angles
A tapered key with head at one end
Capable of tilting in a recess milled out in the shaft

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Machine Design
The designation M 33 × 2 of a bolt means

Metric threads of 33 numbers in 2 cm
Bolt of 33 mm nominal diameter having 2 threads per cm
Metric threads with cross-section of 33 mm
Metric threads of 33 mm outside diameter and 2 mm pitch

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Machine Design
Spring stiffness is

Its ability to absorb shocks
Load required to produce unit deflection
Ratio of coil diameter to wire diameter
Its capability of storing energy

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