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Hogar Banco de preguntas Ingeniería Archive 2025 February 28

Engineering Questions from Feb 28,2025

Browse the Engineering Q&A Archive for Feb 28,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Question: If the stress concentration factor for a given flaw is 2, an applied stress of 10 MPa will yield a mannified stress at the When load is added to a truck with a pneumatic suspension, in which direction should the height control valve lever move? downward upward horizontally stays stationary MEASURING INSTRUMENTS AND ELECTRONICS Power is being transferred by a three-phase four-core cable. 10.1.1 Draw a circuit diagram showing how to couple TWO wattmeters to the cable in order to calculate total power 10.1.2 Give the formula to calculate this total power. 10.1.3 State if the meters will operate effectively if the load is not balanced. UESTION 8: DC MACHINES 1 Explain how an EMF can be induced in a straight piece of copper wire (generator principle). 3 Explain the motor principle. Indicate what type of DC motor will best suit the following requirements: A hoist or lift that must accelerato from standstill 8.3 .2 A fan that runs continuously at a constant speed An application where the load varies and it is important to keep the ( ) QUESTION 7: TRANSFORMERS 7.1 A threc-phase star/delta-conneded transformer has 200 turns per phase on the primary windings and 30 tums per phase on the secondary windings. 7.1.1 Calculate the second ary line voltage if the primary is connected to a 380 V three-phase supply. 7.12 What current can this transformet deliver if it is sated at 30 KVA ? 72 Explain the operating principle of transformers. QUESTION 7: TRANSFORMERS 7.1 A three-phase staridella-connecled transformer has 200 turns per phase on the primary windings and 30 turns per phase on the secondary windings. 7.1.1 Caloulate the secondary line voltage if the primary is connectod to a 380 V three-phase supply. (5) 7.12 What current can this transformer deliver if it is rated at 30 kVA ? (2) 7.2 Explain the operaling principle of transformers (3) [10] UESTION 8: DC MACHINES Explain how an EMF can be induced in a straight piece of copper wiro (generator principle). (3) 2 Explain the motor principle. (3) Indicate what type of DC motor will best suit the following requirements: 8.3.1 A hoist or lift that must accelerate from standstill 8.3.2 A fan that runs continuously at a constant speed 8.3.3 An application where the load varies and it is important to keep the speed constant What visual evidence will immediafely tell you if a motor armature is lap wound? QUESTION 6: THREE-PHASE AC SYSTEMS 6.1 Calculate the phase voltage and phase current of a star-connected load that is drawing 15 A from a 380 V supply. 6.2 (2) Draw a circut diagram of the star-connected load and inserf your answers and the given data of QUESTION 6.1 in appropriate places on the diagram. Three-phase supplies come fromgenerators that have three separato windings on their rotors. (4) QUESTION 2 2.1 Name the correct rating for circuil breakers used in the following subcircuiks: 2.1.1 Light subcircuit 2.12 Stove subcircuit 2.1.3 Geyser subcircuit 2.2 Explain the operating principle of an immersion thermostat commonly found in geysers. 2.3 Draw the wiring diagıam of a geyset subcircuit 1.1 Explain the principle of operation of a heater that falls into the radiant categor 1.2 Name TWO other categories for space heaters, apart from the one mention in QUESTION 1.1 . 1.3 The TWO motors in a twin tub washing machine operate at different speeds Refer to the construction of the motors to indicate the speed difference. 1.4 QUESTION 1 1.1 Explain the principle of operation of a heater that falls into the radiant category. 1.2 Name TWO other categories for space heaters, apart from the one mentioned in QUESTION 1.1. 1.3 The TwO motors in a twin tub washing machine operate at different speeds. Refer to the construction of the motors to indicate the speed difference. 1.4 Name TWO electrical protection devices that are commonly used in stove wiring QUESTION 2 2.1 Name the correct rating for circuil breakers used in the following subcircuits. 211 Light subcircult 2.1.2 Slove subcircuit 2.1.3 Geyser subcircuit 22 Explain the operating principle of an immersion thermostat commonly found in geysers. 2.3 Draw the wiring diagram of a geyser subcircuit QUESTION 3 31 Use the sketch in FIGURE 1 below to explain the operation of the sodium vapour lamp 11038
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