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Home Question Bank Engineering Archive 2025 January 07

Engineering Questions from Jan 07,2025

Browse the Engineering Q&A Archive for Jan 07,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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30) A triplex pump uses three double-acting pistons in cylinders that drive the mud on both the forward and backward strokes. \( X \) uestion (3) Solve the following problem: (15 Marks) gas reservoir has the following properties: reservoir pressure is 3000 psia, reservoir emperature is \( 200^{\circ} \mathrm{F} \), gas apparent molecular weight \( 25.81 \mathrm{lb} / \mathrm{lb} \)-mole. Calculate: a) Gas deviation factor. b) Gas density at reservoir condition. 9 c) Gas specific volume at reservoir condition. ) , \( \frac{1}{5} \) d) Gas density at standard condition. e) Gas specific volume at standard condition. Question (4) Mention: (15 Marks) a) The principal hydrocarbon series found in petroleum. (2 Marks) b) Types of reservoir hydrocarbons according to chemists' classification. (3 Marks) c) Types of rotary drilling rigs. (7.5 Marks) d) Five of the considerations required for choosing a drilling fluid. (2.5 Marks) \[ \begin{array}{l} P V=M R T \quad Q=\frac{1.127 * 10^{-3} \mathrm{KA} \Delta P}{\mu \beta \mathrm{~L}} \\ \frac{P_{M} N T}{R T}=\frac{\mu}{V} R P^{\rho} \\ R=10,73 \\ Q=\frac{7.08 * 10^{-3} \mathrm{Kh}\left(P_{e}-P_{w f}\right)}{\mu \beta \ln \left(r_{e} / r_{w}\right)} \\ \mathrm{T}_{\mathrm{pc}}=187+330 \gamma_{\mathrm{g}}-71.5 \gamma_{\mathrm{g}}{ }^{2} \\ P_{p c}=706+51.7 \gamma_{g}-11.1 \gamma_{g}{ }^{2} \end{array} \] \( T P C=42 \) \( P_{P C}=74 \) \( \therefore p r=4 \) \( T r=1,55 \) FORM 1 HOLIDAY ASSIGNMENT 1. a) State the MAIN reason why PVC is used as a material for making instaliation cables. b) Explain the following circuit conditions using suitable diagrams. Closed eircuit Open circuit short circuit c) Define the following electrical terms: Conductance Resistance Potential difference d) State the ohms law and draw the ohms triangle. e) What is the resistance of resistors with the following colour codes Green, vellow,red, sitver Purple, yellow, green Orange, orange,orange, pold f) Give the colour codes of the resistors whose resistance values are \( \checkmark 57 \mathrm{k} \pm 5 \% \) r \( \quad 1.5 k+10 \% \) , \( 150 \mathrm{~K} \pm 20 \% \mathrm{~m} \) - \( 42 \mathrm{M} \pm 5 \% \) 2. A a) Calculate the length of copper wire with a diameter 2.5 mm and a resistance of given the resisitivity of \( 0.017 \mu \mathrm{Om} \). เครื่องยนต์ และหาปริมาตรห้องเผาไหม้ ( 6 คะแนน ) 3. เครื่องยนต์มีอัตราส่วนการอัด \( 9: 1 \) bore \( \times \) stroke \( =80 \times 81 \mathrm{~mm} \) ถ้าต้องการเพิ่มกำสังอัต โดยไสฝาสูบออก 1.4 mm อัตราส่วนการอัดใหม่จะมีค่าเท่าไร ( 4 คะแนน) 3. เครืองยนต์มีอัตราส่วนการอัด \( 9: 1 \) bore \( \times \) stroke \( =80 \times 81 \) โดยไสฝาสูบออก 1.4 mm อัตราส่วนการอัดใหม่จะมีค่าเท่าไร ( 4 คะแนน ) 4. เครื่องยนต์แบบ 4 สูบ 16 วาล์ว มีขนาดเส้นผ่านศูนย์กลางกระบอกสูบ (Bore) 82 mm . ระยษ ชัก 86 mm .และมีอัตราส่วนการอัด \( 10.5: 1 \) จงหาขนาดความสูงของห้องเผาไหม้ (3 คะแนน) 2. เครื่องยนต์แก๊สโซลีน 4 สูบ 4 จังหวะเครื่องยนต์เครื่องหนึ่งมีขนาดเส้นผ่านศูนย์กลางกระบอก สูบ (Bore) 78 mm . ระยะชัก 82.5 mm . และมีอัตราส่วนการอัด \( 10: 1 \) จงหาปริมาตรดูดของ เครื่องยนต์ และหาปริมาตรห้องเผาไหม้ ( 6 คะแนน ) Esercizio n .1 Dato il sistema ad anello aperto \( \mathrm{L}(\mathrm{s})=\mathrm{k} \frac{200(\mathrm{~s}+0.1)}{(\mathrm{s}-1)(\mathrm{s}-2)(\mathrm{s}+10)^{2}} \) A) Determinare per quali valori di k il sistema a loop chiuso \( \mathrm{F}(\mathrm{s})=\frac{\mathrm{L}(\mathrm{s})}{1+\mathrm{L}(\mathrm{s})} \) è stabile asintoticamente. B) Tracciare al variare del guadagno k il luogo delle radici relativo ai poli della \( \mathrm{F}(\mathrm{s}) \) per valori positivi di k . C) In relazione al luogo delle radici tracciato al punto B\( ) \), calcolare le radici al limite di stabilità. D) Calcolare, per \( \mathrm{k}=+4 \) e \( \mathrm{k}=+10 \), i valori del segnale di errore \( \mathrm{e}(\mathrm{t}) \) a regime quando sono presenti nel contempo un segnale di riferimento in ingresso \( \mathrm{u}(\mathrm{t})=3 \cdot \delta_{-1}(\mathrm{t}) \) ed un disturbo in uscita additivo \( \mathrm{d}(\mathrm{t})=1 . \delta_{-1}(\mathrm{t}) \). Per gli stessi valori di k calcolare l'errore a regime per il segnali di ingresso \( \mathrm{u}(\mathrm{t})=10 \mathrm{t} \cdot \delta_{-1}(\mathrm{t}) \)
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