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專業科目試題 筆試科目:工程力學

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國立高雄海洋科技大學承辦臺灣港務股份有限公司 104 年度從業人員 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(含流力)

甄選類科:05 機械 可使用電子計算機

題號 題目

1

流體於 x-y 平面上流動,其 x、y 方向之速度分量分別為 u = 2Ax+By 及 v = Bx-2Ay,A 及 B 均為常數。

(1)請證明此流體為不可壓縮流體(incompressible fluid),並推導其流線 函數(stream function)。

(2)請證明此流場為非旋性流(irrotational flow),並推導其勢流函數 (potential function)。

配分:20 分,每小題 10 分

2

圖示懸臂樑由粗細不同截面之兩階段組成,各 階段之楊氏模數均為 E,細段之截面慣性矩

(moment of inertia)為 I、長度為 L/3,粗 段之截面慣性矩為 3I、長度為 2 L /3,若於 該懸臂梁端點位置施加向下之力 F,試計算於 該端點位置之位移量。

配分:20 分

3

某直徑為d 之實心圓軸以 600rpm 傳送 30kW 功率,且不超過其 28Mpa 之容許 剪應力,請問此軸之最小直徑為何?

配分:15 分

考科編號:009

第 1 頁 共 2 頁

(2)

題號 題目

4

Strain gauges a and b are attached to the surface of a gas tank. The strain gauge a is attached in the longitudinal direction (x axis) and b is arranged at an angle of 450 with x axis, as shown in Fig.

1. The tank has an inner diameter of 1.5 m and wall thickness of 25 mm. It is made of steel having a modulus of elasticity E = 200 GPa and Poisson’s ratio ν = 1/3.

(1) When the tank is pressurized, the strain gauge a shows a reading of εa = 250×10–6. Determine the pressure p in the tank.

(2) If the tank is pressurized, the strain gauge b gives a reading of εa = 250×10–6, what is the pressure p in the tank?

Fig. 1 配分:20 分,每小題 10 分

5

Determine the damping ratio ζ of the system depicted in Fig. 2. The mass and friction of the pulleys are negligible, and the cable remains rigid at all times.

Fig. 2

配分:25 分

第 2 頁 共 2 頁

數據

Fig. 1   配分:20 分,每小題 10 分

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