Why should you be in the proper gear before starting down a hill

Air brake


Brakes cafe or fail from excessive heat caused by using them too much and not relying on the engine braking effect

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What would you suspect first, if standard medium temperature reach-in with a fixed metering device had the following conditions:

? a condensing temperature 20° above ambient, LOW ? 21° subcooling, HIGH ? evaporator temperature 50° below box temperature, LOW ? and 25° superheat? HIGH (Starving) a. dirty condenser b. dirty or iced evaporator c. low on charge d. restricted cap tube

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Toe-out on turns is:

A. adjustable turning angle on steering axle. B. turning radius. C. measured in degrees by turning one wheel a specified amount and then measuring the angle of the other wheel. D. both B and C.

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Why should an air vent never be put on a closed-type expansion tank?

A) The large amount of air in the expansion tank would overload the air vent. B) The expansion tank is usually not located in a serviceable location. C) Closed-type expansion tanks are normally installed at a low point in the system. D) A closed expansion tank requires an air head to work properly.

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Answer the following statement(s) true (T) or false (F)

1. Photodetectors have to make physical contact with the object they are sensing. 2. Photovoltaic cells cannot operate electrical equipment without external power. 3. Photoconductive devices exhibit a change of resistance due to the presence or absence of light. 4. The amount of voltage produced by a cell is determined by the material of which it is made. 5. Photodetectors that have both the transmitter and the receiver units mounted in the same housing depend on a reflector for operation.

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