1 Watt = _____ Btu

_______ is the temperature at which oil starts to produce a waxy substance that may interfere with the refrigeration system:

_______ use two special helical rotors that introduce suction vapors then compress them:

When there is an increase in the heat load on the evaporator, the refrigerant will tend to evaporate at a _____ rate:

Which of the following shall not be used near flammable material:

The ________ of the manifold gauge set is used to charge, evacuate, add oil and recover refrigerant from a refrigeration and air conditioning system:

Higher the ambient temperatures, ____ will be the evacuation time of the refrigerants from the system:

Sight glass is present at _____ in the refrigeration cycle:

An oil separator is located in the _____:

______ is the heat that is absorbed or extracted when a substance changes its state:

Current in a closed circuit is limited by which of the following:

What will be the resistance in the circuit if the supply voltage is 30V and current flowing through the circuit is 5A:

Propane and Butane are _______ than air:

Gas valves operate at _____ voltage:

Furnaces are placed into categories based upon:

A high pressure steam boiler operates at a pressure greater than ______ :

1 kWh of electric power is equivalent to ______ Btu per hour: