cal 393 IFigure: Welded butt joints are under application of load il Answer Q15-

Question

cal 393 IFigure: Welded butt joints are under application of load il Answer Q15-016 1n1 15. The expression for normal (Censile stress), while ignore reinforcement.... (a) Fl.h) (b) 2F/(L.h) (c) F/ a/4 h (d) F 16. The expression for shear stress, while ignore reinforcement (a) F/L.h) (b) 2F/d.h) (e) F/4 ) (d) F/h ll tl h q nd Phe Nc 17. In gear transmissions, to transmit power, pressure angle is kept.. (a) Smaller but greater than 0 (b) Larger but slightly less than 90 (c) Equal to 0° (d) Equal to 90 As 18. The expression to calculate speed ratio for the reverted gear train is (a) N2/NS T5/12 x T3/T4 19. For the reverted gear train shown in above figure, if gear 4 is rotating clockwise, the direction of rotation of gear 2 will be (a) Clockwise (b) Counter clockwise (c) Not possible to determine with given information 20. Distortion energy theory of failure (von Mises) is applicable for following type of materials and loadings (a) Ductile materials under static loading (b) Brittle materials under static loading (c) Ductile materials under fatigue loading (d) Brittle materials under fatigue loading Page 4 of 11

Explanation / Answer

15. (a) Tensile stress = F/A = F/Lh

16. (c) Shear stress = F/(h^2/4)

17. (a) pressure angle usually 14 to 20 degree used that's why option a

18. (a) based on formula that speed ratio is inverse of train value

19. (b) External gears rotate in opposite directions

20. (a) Because used for Aluminium for example which is ductile and also under static load as for fatigue we use Gerber's , Soderberg and Goodman theories.

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