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Home Question Bank Engineering Archive 2024 December 10

Engineering Questions from Dec 10,2024

Browse the Engineering Q&A Archive for Dec 10,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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(a) List the types of construction hazards. (b) Discuss five (5) measures that can be implemented by the management of construction companies to limit/prevent the likelihood of construction accidents. \( F _ { 1 } = \frac { 1 } { 2 \pi } [ - \frac { 180 \Omega } { 2 * 560 \mu H } + \frac { 1 } { 2 } \sqrt { ( \frac { 180 \Omega } { 560 \mu H } ) ^ { 2 } + \frac { 4 } { 560 \mu H * 220 nF } } ] \) Determine \( R_{C} \) and \( R_{B} \) for a fixed-bias configuration if \( \mathrm{V}_{\mathrm{CC}}=12 \mathrm{~V}, \beta=80 \), and \( \mathrm{I}_{\mathrm{CQ}} \) \( =2.5 \mathrm{~mA} \) with \( \mathrm{V}_{\mathrm{CE}}=6 \mathrm{~V} \). Use standard values Calculate the component values of a monostable multivibrator using silicon npn transistor, developing an output pulse of \( 120 \mu \) sec duration. Assume \( \left(h_{\mathrm{fe}}\right)_{\min }=20 \), \( \mathrm{I}_{\mathrm{C}(\mathrm{sat})}=6 \mathrm{~mA}, \mathrm{~V}_{\mathrm{CC}}=6 \mathrm{~V} \) and \( \mathrm{V}_{\mathrm{BB}}=1.5 \mathrm{~V} \). If \( \mathrm{r}_{\mathrm{bb}}=150 \Omega \), calculate the magnitude of the overshoot. PROBLEM 34: A pressure gauge at elevation 8 m at the side of a tank containing liquid reads 85 kPa . Another pressure gage at elevation 3 m reads 120 kPa . Compute the specific gravity of the liquid. \( \begin{array}{ll}\text { a. } 0.82 & \text { b. } 0.63 \\ \text { c. } 0.82 & \text { d. } 0.71\end{array} \) PROBLEM 31: A rectangular flume of most efficient proportion has a perimeter of 6 m . and carries a discharge of \( 3.0 \mathrm{~m}^{3} / \mathrm{s} \). Compute the increase in the discharge if the section is to be replaced by a most efficient trapezoidal section using the same material. \( \begin{array}{ll}\text { a. } 1.43 \mathrm{~m}^{3} / \mathrm{s} & \text { b. } 0.81 \mathrm{~m}^{3} / \mathrm{s} \\ \text { c. } 1.12 \mathrm{~m}^{3} / \mathrm{s} & 2.65 \mathrm{~m}^{3} / \mathrm{s}\end{array} \) PROBLEM 30: An old pipe is to be replaced by a new one with the same diameter and length. If the friction factor of the new is \( 2 / 3 \) of the old, compute the ratio of flow of the new to the old pipe. \( \begin{array}{ll}\text { a. } 0.85 & \text { b. } 1.41 \\ \text { c. } 1.22 & \text { d. } 0.81\end{array} \) PROBLEM 30: An old pipe is to be replaced by a new one with the same diameter and length. If the friction factor of the new is \( 2 / 3 \) of the old, compute the ratio of flow of the new to the old pipe. \( \begin{array}{ll}\text { a. } 0.85 & \text { b. } 1.41 \\ \text { e. } 1.22 & \text { d. } 0.91\end{array} \) phase, \( 400 \mathrm{~V}, 37 \mathrm{~kW} \) motor runs at a power factor of 0.87 . Determine: the apparent power drawn by the motor (Ans: 42.529 kVA ) 37 the reactive power generated by the motor. (Ans: 20.969 kVAr ) the current drawn by the motor. (Ans: 61.3849 A )
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