## Machine Design If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum shear stress theory
Maximum principal stress theory
Maximum strain energy theory
Maximum distortion energy theory

## Machine Design The resilience of a bolt may be increased by

Increasing its length
Decreasing its length
Decreasing its shank diameter
Increasing its shank diameter

## Machine Design The rolling contact bearings are known as

Plastic bearings
Thin lubricated bearings
Antifriction bearings
Thick lubricated bearings

## Machine Design A screw will be self locking, if

Friction angle is equal to helix angle
Friction angle is more than helix angle
Friction angle is less than helix angle
Efficiency of screw is 100%

Fatigue strength
Embeddability
Comformability
Bondability

## Machine Design When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent twisting moment is equal to

(1/2) × √(M² + T²)
(1/2) × [M + √(M² + T²)]
M + √(M² + T²)
√(M² + T²)