High-frequency test points for First-Class Constructor in Mechanical and Electrical Engineering – Building Intelligence Projects & Industrial Furnaces
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This post was last edited by The one on 2026-6-30 07:12. First-Class Constructor Mechanical and Electrical – \"Building Intelligence Engineering\": 1. System installation ✅ Key points: Location of sensor installation (avoiding heat sources, vibrations, strong magnetic fields); requirements for signal cable installation (shielding, grounding, wiring techniques). 💡 Mnemonic: Sensor positions must be precise; cable shielding prevents interference.
📌 2025 First-Class Constructor Mechanical and Electrical Real Exam (Single Choice) Question: Passive infrared detectors in intrusion alarm systems ( ). A. It can be installed facing the direction of the light. B. It cannot be installed on objects that are prone to vibration. C. It can be installed facing the air conditioner outlet. D. The installation height is usually 1.5–1.8 meters
Answer: B 🔍 Explanation: Passive infrared detectors should not be installed on objects that are in motion, nor should they face heat sources or the air outlets of air conditioners. The typical installation height is 2.2 to 2.7 meters.
2. System debugging ✅ Key point: Comprehensive testing of the water supply/reused water monitoring system； 50% of the drainage samples shall be inspected, with a minimum of 5 sets ； 💡 Mnemonic: Full inspection for water supply, half for drainage.
📌 2024 First-Class Constructor Mechanical and Electrical Real Exam (Single Choice) Question: A project includes 6 water supply monitoring systems; what is the minimum number of tests that need to be conducted? A. 2 sets B. 3 sets C. 5 sets D. 6 sets
Answer: D 🔍 Explanation: The water supply and reclaimed water monitoring systems should all be inspected. 50% of the drainage monitoring systems should be sampled, with a minimum of 5 sets; if the total number is less than 5, all of them must be tested.
First-Class Constructor Mechanical and Electrical – \"Industrial Furnaces\": 1. Furnace drying curve ✅ Key topics: The contents of a furnace drying curve include the duration of drying, the rate of temperature increase, the time at which a constant temperature is maintained, the maximum temperature, the temperature at which the heating system needs to be replaced, measures taken for furnace drying, operating procedures, and emergency plans. 💡 Mnemonic: Seven elements of the furnace heating curve – timing, heating rate, and constant temperature values ； Maximum temperature system switch, procedural emergency plan.
📌 2023 First-Class Constructor Mechanical and Electrical Real Exam (Single Choice) Question: When heating industrial furnaces, what is NOT included in the heating curve that is prepared? A. Heating rate B. Holding time C. Drying time D. Material properties
Answer: D 🔍 Explanation: The furnace drying curve includes: the drying period, heating rate, time at constant temperature, maximum temperature, temperature at which the heating system needs to be replaced, drying measures, operating procedures, and emergency plans, among others. Material properties are not part of the furnace drying curve.
2. Furnace construction ✅ Key points: Before constructing an industrial furnace, it is necessary to inspect the furnace structure, mark out the dimensions, and inspect the refractory materials. 💡 Mnemonic: Check the materials for the furnace body, three things to do before construction.
📌 2025 First-Class Constructor Mechanical and Electrical Real Exam (Multiple Choice) Question: The methods that can be used for installing the blast furnace shell are ( ). A. Top normal assembly, bottom inverted assembly method B. Normal assembly method C. Off-line assembly with overall sliding method D. Inverted assembly method E. Top inverted assembly, bottom normal assembly method