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Technician A says modern thermostats remain closed until coo…

Technician A says modern thermostats remain closed until coolant temperature is as high as 180°F (82°C). Technician B says once the engine is completely warmed up, the thermostat has no effect on cooling system operation. Who is right?

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A late-model hybrid vehicle with a motor-driven compressor h…

A late-model hybrid vehicle with a motor-driven compressor has poor cooling. Technician A says that the best way to check system operation is with a scan tool. Technician B says that using an electronic leak detector may damage the motor insulation. Who is right? 

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Technician A says R-134a has no effect on global warming. Te…

Technician A says R-134a has no effect on global warming. Technician B says R-134a has no effect on the ozone layer. Who is right?

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All of the following is used to flush a refrigeration system…

All of the following is used to flush a refrigeration system, except:

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En la figura, se muestra un conductor formado por dos tramos…

En la figura, se muestra un conductor formado por dos tramos dentro de una región donde existe un campo magnético uniforme de magnitud , dirigido hacia dentro del plano de la página. El conductor está compuesto por un primer tramo vertical de longitud y un segundo tramo inclinado de longitud , el cual forma un ángulo de

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What two devices are never found on the same refrigeration s…

What two devices are never found on the same refrigeration system?

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Technician A says if the pressure is held constant, a substa…

Technician A says if the pressure is held constant, a substance will have different vaporizing and condensing temperatures. Technician B says higher pressures cause higher boiling points. Who is right?

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Technician A says heat always travels from a warmer object t…

Technician A says heat always travels from a warmer object to a colder one. Technician B says when all objects in an area are at the same temperature, no heat transfer will occur. Who is right?

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En la figura, se muestra un conductor recto por el cual circ…

En la figura, se muestra un conductor recto por el cual circula una corriente I que sale del plano de la página. El conductor se encuentra inmerso en un campo magnético uniforme

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Una partícula cargada es acelerada desde el reposo por una d…

Una partícula cargada es acelerada desde el reposo por una diferencia de potencial

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