Engineering College

technician a says that all temperature sensors are ptc devices that decrease in resistance as the temperature increases. technician b says that some vehicle manufacturers use a stepped ect circuit inside the pcm to broaden the accuracy of the sensor. which technician is correct?

Answers

Answer 1

Technician B is correct in stating that some vehicle manufacturers use a stepped ECT circuit inside the PCM to broaden the accuracy of the sensor.

Technician A says that all temperature sensors are PTC devices that decrease in resistance as the temperature increases. Technician B says that some vehicle manufacturers use a stepped ECT circuit inside the PCM to broaden the accuracy of the sensor. To determine which technician is correct, let's analyze each statement.

Technician A's statement is partially correct. PTC stands for Positive Temperature Coefficient, which means that the resistance of a PTC device increases as the temperature increases. However, not all temperature sensors are PTC devices. There are also NTC (Negative Temperature Coefficient) sensors, which decrease in resistance as the temperature increases. Therefore, Technician A's statement is incorrect.

Technician B's statement is correct. Some vehicle manufacturers use a stepped ECT (Engine Coolant Temperature) circuit inside the PCM (Powertrain Control Module) to improve the accuracy of the sensor. The stepped ECT circuit consists of different resistance values at various temperature points. By having multiple resistance values, the accuracy of the temperature measurement can be improved. This allows the PCM to better control the engine's performance and emissions based on the coolant temperature.

Technician B is correct in stating that some vehicle manufacturers use a stepped ECT circuit inside the PCM to broaden the accuracy of the sensor. However, Technician A is incorrect in claiming that all temperature sensors are PTC devices.

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Related Questions

a new integration method based on the coupling of mutistage osculating cones waverider and busemann inlet for hypersonic airbreathing vehicles

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Therefore, the phrase describes a new method of integrating multistage osculating cones, waverider, and Busemann inlet technologies to improve the performance of hypersonic airbreathing vehicles. This integration aims to enhance aerodynamic efficiency and reduce drag, ultimately leading to more efficient and faster vehicles.

The phrase "a new integration method based on the coupling of multistage osculating cones waverider and Busemann inlet for hypersonic airbreathing vehicles" refers to a method of combining different technologies to improve the performance of hypersonic airbreathing vehicles. Here is a step-by-step explanation:

1. Multistage osculating cones: These are structures that change shape at different stages of flight to optimize aerodynamic performance. They are used to reduce drag and increase efficiency.

2. Waverider: A waverider is a type of vehicle design that uses the shockwaves generated by its own supersonic flight to create lift. This design allows for increased aerodynamic efficiency at high speeds.

3. Busemann inlet: A Busemann inlet is a type of air intake design that reduces the effects of shockwaves during supersonic flight. It helps to slow down and compress the incoming air, increasing efficiency and reducing drag.

4. Integration method: The integration method mentioned in the question refers to combining the multistage osculating cones, waverider, and Busemann inlet technologies to create a more efficient and high-performing hypersonic airbreathing vehicle.

The phrase describes a new method of integrating multistage osculating cones, waverider, and Busemann inlet technologies to improve the performance of hypersonic airbreathing vehicles. This integration aims to enhance aerodynamic efficiency and reduce drag, ultimately leading to more efficient and faster vehicles.

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a single-phase 50 kva, 2400–120 v, 60 hz transformer has a leakage impedance of (0.023 1 j 0.05) per-unit and a core loss of 600 watts at rated voltage

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The leakage impedance of a single-phase 50 kVA, 2400-120 V, 60 Hz transformer is (0.023 + j0.05) per-unit.

The leakage impedance of a transformer represents the resistance and reactance of the winding that does not contribute to the power transfer. In this case, the leakage impedance is given as (0.023 + j0.05) per-unit. The real part, 0.023, represents the resistance, while the imaginary part, 0.05, represents the reactance. The per-unit value is used to normalize the impedance with respect to the rated values of the transformer.

The core loss of the transformer is given as 600 watts at rated voltage. Core loss refers to the power dissipated in the transformer core due to hysteresis and eddy current losses. It is important to consider the core loss when calculating the overall efficiency of the transformer.

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