FA1 - Machine Design

2. Type of coupling designed to protect the shaft system from overloads.
4. In static loading, the ratio of actual working stress to yield stress.
6. If mean stress is 60 MPa and amplitude stress is 40 MPa, alternating stress is ____ MPa.
7. Diagram used to represent the safe and unsafe regions for fluctuating stresses.
9. Theory of failure suitable for brittle materials, also called Maximum Normal Stress Theory.
10. Failure theory used for design of ductile components under complex stress states, based on distortion energy.
12. If σmax = 120 MPa and σmin = 40 MPa, mean stress is ____ MPa.
15. If a steel shaft of 40 mm diameter transmits 25 kW at 300 rpm, torque is approximately ____ N-m.
18. Type of coupling that can tolerate slight angular and axial misalignments.
19. Graphical method to evaluate fatigue strength under combined stresses.
20. In fatigue loading, this stress is calculated as (σmax – σmin)/2.

1. For a bolt under eccentric loading, the maximum load acts on the bolt farthest from this point.
3. Endurance limit of steel is approximately ____ % of its ultimate tensile strength.
5. Design stress obtained after applying factor of safety.
8. In fatigue design, failure occurs even when stresses are below yield point due to this phenomenon.
11. For a rotating shaft under bending moment and torque, the design is based on this type of stress.
13. Power transmitted by a shaft = (2πNT)/60. In this formula, T is _____.
14. The stress at which a ductile material begins to undergo significant plastic deformation.
16. When a shaft is suddenly applied with torque, maximum shear stress is ____ times that under static torque.
17. A shaft section weakened by this slot has reduced strength.