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What is the purpose of an expansion tank? Remove air from the water Filter the water Allow for the introduction of make-up water Provide high and low limits on pressure Allow the water to cool - Answer- Provide high and low limits on pressure T or F A boiler room should be maintai...

a unit is operating with a lower than normal suction pressure the probable cause is - Answer- a restricted drier heat absorbed by the refrigerant in the evaporator is rejected at the - Answer- condenser the components that divide the high and low side of the mechanical refrigeration cycle are ...

An instrument that measures potential differences between 2 points in an electrical circuit is called? A. potentiometer B. thermistor C. ohmeter D. voltmeter - Answer- voltmeter This device uses a thermal sensing bulb at the outlet of the evaporator to sense temperature and control superhea...

Propane and Butane are _______ than air: - Answer- Heavier What will be the resistance in the circuit if the supply voltage is 30V and current flowing through the circuit is 5A - Answer- 6 ohms Temperature at which oil starts to produce a waxy substance that may interfere with the refrigeratio...

Matter exists in what three forms? - Answer- solid, liquid, gas What is temperature measured by? Quantity or intensity - Answer- Intensity Define British thermal unit (Btu) - Answer- Measure of heat energy - amount of energy needed to raise 1 lb of water 1 degree F How much heat is required...

Refrigeration - Answer- process of moving heat from an area where it is undesirable to an area where heat is preferred Refrigeration System - Answer- a closed system that controls the pressure and temperature of the refrigerant to regulate the absorption and rejection by refrigerants A ton of ...

volt amps - Answer- Transformers are normally rated in? true - Answer- An insulated jumper may be used to temporarily jump a component in an electrical circuit(true or false)? divided by 10 - Answer- When using a 10 wrap multiplier the reading on the meter must be? ladder diagram - Answer- ...

Cooling - Answer- What type of application is a close-on-rise thermostat usually used for? A systems switch and a fan - Answer- What two manual switches are found on most low voltage thermostats? The operating mode: Off, cooling, heating. The fan switch for on or auto. - Answer- What systems f...

According to the National Electrical Code, UF cable is permitted to be used in which of the following locations? - Answer- in wet, dry or underground locations NEC Article 340.10 & 340.12 The rating of a disconnect switch on fixed HVAC equipment must be at least _________ percent of the nameplat...