HVAC FC 04

The ___ is the temperature below which water vapor in the air will start to condensate.

• wet bulb point
• dry bulb point
• dew point
• sensible point

Why is it necessary to be cautios when handling contaminanted refrigerant oil?

• It may contain PCBs
• It may be acid
• It is highly Flammable
• It is known carcinogen

When pressure testing hydronic systems, the pressure shall be maintained for a MINIMUM of

• 15 minutes
• 30 minutes
• 45 minutes
• 1 hour

The ____ measures the rate of flow of current.

• volt
• ampere
• power
• watt

Which types of gauges are used to check pressures on an absorption system?

• steel manifold gauges
• brass manifold gauges
• copper manifold gauges
• aluminum manifold gauges

A crankcase heater installed in a Heat Pump System is being used to _____.

• protect the compressor from "freeze-up"
• provide supplemental heat
• prevent liquid refrigerant build-up in the compressor
• produce supplemental vapor

Previous step to connecting a regulator to a fuel-gas cylinder valve is:

• to crack the seal with a metal rod
• to open the valve quickly until a cracking sound is heard
• to tap the regulator with a wrench to loosen any dust or dirt on it
• to open the valve slightly and close it immediately

According to the International Mechanical Code, which method is approved to prevent grease from pooling in Type 1 grease duct cleanouts located on the bottom duct?

• bridging
• curbing
• daming
• draining

The ___ is a thermal device that opens its contacts when a motor heater coil uses too much current.

• relief relay
• fuse
• thermal relay
• control relay

At what head pressure should the regulating valve be set to open with an inlet water temperature of 75 degrees F that is installed on a water-cooled condenser using R-22?

• 144 psig
• 152 psig
• 160 psig
• 173 psig