Which of the following gas shall not be used to pressurize a refrigeration system:

Which of the following compressors have pulsations:

A filter drier is located in the Liquid line at the outlet of the condenser:

Suction pressure at the ________ is governed by the design of the evaporator:

Higher the suction pressure, the greater the efficiency of the _______:

When a system is circulating an excessive amount of oil, the oil indicator may become saturated. This results in the indicator to appear in _______ color

With increase in evaporator load, the liquid refrigerant evaporates at _____ rate:

Excessive pressure drop in liquid lines will result in which of the following:

The horsepower required for any fan or blower varies directly as the ______ of the speed:

______ of a fan is the total pressure diminished by the fan velocity pressure:

The purpose of an accumulator is to prevent ______ damage due to slugging of refrigerant and oil:

The refrigerant holding capacity of the accumulator is based on an average conditions of ______ percent fill under running conditions:

________ compressors operate most efficiently with a high molecular weight, high specific volume refrigerant:

Fuse is used for which of the following protection:

As the number of poles in a motor increases, the speed of the motor _______:

The wetback fire tube boiler has more heating surface compared to dryback fire tube boiler:

The minimum Annual Fuel Utilization Efficiency (AFUE) available is set by federal law for most furnace types at _______ :