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  • Ten Daily Electronic Common Sense-Section 17

    What is a mutual sensor?

    A sensor that converts the measured non-electricity change into a change in the mutual inductance of the coil and causes the output potential of the secondary coil to change accordingly is called a mutual-sensing sensor.

    What are the obvious advantages of scheduling algorithms that make WiMAX beyond Wi-Fi?

    • Wi-Fi is generally a short-range system, usually at a distance of 100 m (although it can exceed 1 km when using a directional antenna. WiMAX is a long-distance system that can cover 50 km.
    • Wi-Fi technology only supports about 10 users)And WiMAX supports about 1,000 users.
    • Maximum spectral efficiency, 5.0 bps/Hz at 802.16a and 2.7 bps/Hz at 802.1 1.
    • Wi-Fi wireless networks are designed to handle narrow inner 0.8 ̈s multipath delay spread, while WiMAX is designed to tolerate greater multipath delay spread (signal reflection) to 10.0 ̈s.i-Fi operates in the license-free 2.4 GHz band, making it more susceptible to scanning and packet attacks, while WiMAX networks operate at 2.5 GHz license frequencies. The licensed frequency and OFDM make it a more secure connection.

    What is the working principle of the hot wire air flow sensor?

    The hot-wire type air flow sensor of the mainstream measurement method mainly consists of a protective net, a sampling tube, a hot wire Resistor, a temperature compensating Resistor, and a control circuit board.The hot wire resistance and temperature compensation Resistorss are mounted in the main intake port and the control circuit board is mounted below the flow sensor.

    What kinds of oil pressure sensors are there?

    1. Oil rail fuel pressure sensor
    2. Oil tank pressure sensor
    3. Oil pressure sensor
    4. Automatic transmission oil pressure sensor

    What are the precautions for fault diagnosis of automotive in-vehicle network systems?

    1. When using a tester, its open port voltage should be 7V or lower. Do not apply 7V or higher to the measurement port.
    2. Be sure to turn off the ignition switch and disconnect the battery negative cable before checking the circuit. Do not disconnect or reconnect the powertrain interface module harness connector while the ignition is on.
    3. When welding with electric welding equipment, the harness connector must be disconnected from the power system interface module.
    4. Do not touch the power system interface module wiring harness connector terminals or the soldered components on the power system interface module circuit board to prevent damage caused by electrostatic discharge.
    5. In order to avoid damage to the wiring harness connector terminals, be sure to use the appropriate wiring harness test leads when testing the power system interface module wiring harness connector.
    6. The power system interface module is extremely sensitive to electromagnetic interference. When performing service procedures, ensure that the powertrain interface module harness is routed correctly and securely attached to the mounting clips.
    7. Due to the sensitivity of the power system interface module circuit, a special circuit repair procedure has been formulated, which must be strictly implemented.
    8. Ensure that all harness connectors are properly secured.
    9. Do not disconnect the battery from the vehicle electrical system when the engine is running.
    10. Before charging the battery, be sure to disconnect the battery from the vehicle electrical system.
    11. Never use the fast charger to start the vehicle.
    12. Make sure the battery cable terminals are firm.
    13. Before installing a new power system interface module, make sure that the type to be installed is correct, and be sure to refer to the latest spare parts information.
    14. When the connector needs to be replaced, only the approved electrical connector can be replaced to ensure correct fit and prevent excessive resistance in the line. After replacing the new control unit, the new control unit must be re-coded. The coding of the control unit can be carried out with the manufacturer’s dedicated diagnostic instrument, and the operation is carried out according to the menu prompts.

    What are the four types of films used for microelectronics?

    There are four types of films for microelectronics: thermal oxide films for electrical or thermal insulation; insulating layers for electrical insulation; polysilicon layers for making local conductance; metal films for electrical contacts or leads.

    A simple DFD graphic description consists of several basic components?


    What is the current constraint?

    • Static: The steady-state current level required for normal operation.
    • Output capacitive load: The charging current that the driver must supply for the capacitive load.
    • Cycle switching: The periodic charging current of the decoupling capacitor.

    What are the advantages of Zigbee technology?

    Close range, low power consumption, low cost, network capacity, high reliability

    What are the three types of piezoelectric accelerometer structures?

    Piezoelectric acceleration sensor structures generally have three types: longitudinal effect type, lateral effect type, and shear effect type.


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