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Home Question Bank Engineering Archive 2024 December 09

Engineering Questions from Dec 09,2024

Browse the Engineering Q&A Archive for Dec 09,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Instrucciones: Describa el principio de la ecuación de Bernoulli para un fluicio real y explique las restricciones al usar dicha ecuación. NGEE ANN POL YTECHNIC - DEBFI Module: Building Electrical Systems \& Design (102BED) Question \( 4 \quad \) (8 marks) \( \begin{array}{ll}\text { (a) Explain what is type-tested switchboard? } \\ \text { (b) Explain what is regulated electricity tariff and what type of consumer is charged } \\ \text { under this type of tariff. } \\ \text { (c) What is the purpose of installed the voltmeter in a main switchboard? }\end{array} \) TION \( 3 \quad \) (11 marks) A distribution transformer for a polytechnic is specified as \( 22 \mathrm{kV} / 415 \mathrm{~V}, 2 \) MVA, ONAN, DYN11. (i) Explain the term DYN11. (ii) State two (2) physical differences between this transformer and an ANAF transformer. Explain whether the RCCB in Figure 2 would trip if a Live to Neutral fault occurs. Figure 2 - Single Line Diagram (a) Explain the two (2) errors that can be found in Figure 2. (6) marks (b) State the difference in operation characteristics between a Type B and Typ C MCB. 4 mark (c) Explain whether the RCCB in Figure 2 would trip if a Live to Neutral fault occurs. Calculate the bore (in inches) of a single cylinder for an engine with the following parameters: 4 cylinders, a stroke length of 0.57 feet, has an indicated mean effective pressure (IMEP) of 810 psi per cylinder, operating at 2710 rpm , and operates at 2800 horsepower. Round to 1 decimal place. Calculate the RPM for an engine with the following parameters: 4 cylinders, a stroke length of 0.66 feet, a bore of 3.1 inches, has an indicated mean effective pressure (IMEP) of 1100 psi per cylinder, and operates at 5500 horsepower. Round to 1 decimal place. Remember, \( N= \) RPM \( / 2 \) Calculate the stroke length (in feet) of an engine with the following parameters: 6 cylinders, has an indicated mean effective pressure (IMEP) of 700 psi per cylinder, a bore of 5.2 inches, operating at 3320 rpm , and operates at 2100 horsepower. Round to 2 decimal places. Calculate the Pressure (in PSI) in a single cylinder for an engine with the following parameters: 5 cylinders, a stroke length of 0.97 feet, a bore of 3.9 inches, operating at 2810 rpm , and operates at 6400 horsepower. Round to 1 decimal place. Calculate the indicated horsepower of the following engine: 5 cylinders, a stroke length of 0.77 feet, a bore of 3.8 inches, operating at 3090 rpm , and has an indicated mean effective pressure (IMEP) of 960 psi per cylinder.
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