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臺灣港務股份有限公司 105 年度第 2次從業人員 
經理(主管級)、助理管理師/助理工程師、助理事務員/助理技術員甄試 
專業科目試題 
筆試科目:工程力學(含靜力、材力及流力) 
甄選類科:11 工程    可使用電子計算機 
Draw the shear force and bending  moment diagram of  the beam shown in 
Fig. 1. 
 
 
 
 
 
 
                                       Fig. 1. 
 
An element in plane stress at the surface of a large machine is subjected to 
the stresses state as shown in Fig. 2. Please using Mohr’s circle, determine 
the following  quantities: (a) the stresses acting on an element inclined at an 
angle θ = 40o, (b) the principal stresses, and the maximum shear stresses. 
Please show all results on sketches of properly oriented elements.   
 
 
 
 
 
 
                                Fig. 2.