Red Seal Refrigeration Review UPDATED
Exam Questions and CORRECT Answers
when building a walkin freezer where in the vapor barrier installed? - CORRECT ANSWER-
✔✔Outside on the warmest side of the box
On Compressor Motor Windings how do you calculate Common to Run Winding resistance?
- CORRECT ANSWER- ✔✔Start to Run Winding - Common to Start Winding
when testing compressor motor windings what ohm reading indicates the cleanest system? -
CORRECT ANSWER- ✔✔2000 Ohms
what causes High suction pressure on a heat pump? - CORRECT ANSWER- ✔✔Leaking
reversing valve
what tools do you use to calibrate a economizer? - CORRECT ANSWER- ✔✔Thermometer,
psychrometer, multimeter
What kind of coil do you want for a high dehumification? - CORRECT ANSWER- ✔✔Lots
of rows and low velocity
which Refrigerant oil is the most hygroscopic? - CORRECT ANSWER- ✔✔POE Oil
what does hygroscopic mean? - CORRECT ANSWER- ✔✔Relating to humidity of a
substance that tends to absorb moisture from the air
how would you adjust the king valve when doing a manual pump down? - CORRECT
ANSWER- ✔✔front seat it by turning clockwise (closing the valve)
Where is a king valve located? - CORRECT ANSWER- ✔✔At the Outlet of the liquid
receiver
, where is a queen valve located? - CORRECT ANSWER- ✔✔At the INLET of the receiver
usually used to isolate the receiver it is not very commonly used
Why are glycol inhibitors added to chilled water loops? - CORRECT ANSWER- ✔✔to
prevent corrosion
How many cubic feet is 1 Litre of water? - CORRECT ANSWER- ✔✔0.035ft³
what is the density of water? - CORRECT ANSWER- ✔✔62.41 lb/ft³
How many lbs are in a gallon? - CORRECT ANSWER- ✔✔8.33lbs
how many BTUh is water to steam (vaporization) - CORRECT ANSWER- ✔✔970btu
How many btu is Ice to water? (solidification) - CORRECT ANSWER- ✔✔144btu
what would cause a compressor crankcase to overheat? - CORRECT ANSWER-
✔✔Defective Piston Rings
What is the result of a TXV cap tube bulb being cracked? - CORRECT ANSWER- ✔✔the
compressor superheat would be too high
The RPM of a Fan increases the aMperage will ____________ and the Static pressure will
______________ - CORRECT ANSWER- ✔✔increase, increase
what refrigerants have glide? - CORRECT ANSWER- ✔✔Zeotropes
What do you replace when compressor valves fail? - CORRECT ANSWER- ✔✔Valve plate,
valve plate gasket, and head gasket
what will happen if you have a clogged strainer? - CORRECT ANSWER- ✔✔Compressor
Crankcase pressure will decrease
Exam Questions and CORRECT Answers
when building a walkin freezer where in the vapor barrier installed? - CORRECT ANSWER-
✔✔Outside on the warmest side of the box
On Compressor Motor Windings how do you calculate Common to Run Winding resistance?
- CORRECT ANSWER- ✔✔Start to Run Winding - Common to Start Winding
when testing compressor motor windings what ohm reading indicates the cleanest system? -
CORRECT ANSWER- ✔✔2000 Ohms
what causes High suction pressure on a heat pump? - CORRECT ANSWER- ✔✔Leaking
reversing valve
what tools do you use to calibrate a economizer? - CORRECT ANSWER- ✔✔Thermometer,
psychrometer, multimeter
What kind of coil do you want for a high dehumification? - CORRECT ANSWER- ✔✔Lots
of rows and low velocity
which Refrigerant oil is the most hygroscopic? - CORRECT ANSWER- ✔✔POE Oil
what does hygroscopic mean? - CORRECT ANSWER- ✔✔Relating to humidity of a
substance that tends to absorb moisture from the air
how would you adjust the king valve when doing a manual pump down? - CORRECT
ANSWER- ✔✔front seat it by turning clockwise (closing the valve)
Where is a king valve located? - CORRECT ANSWER- ✔✔At the Outlet of the liquid
receiver
, where is a queen valve located? - CORRECT ANSWER- ✔✔At the INLET of the receiver
usually used to isolate the receiver it is not very commonly used
Why are glycol inhibitors added to chilled water loops? - CORRECT ANSWER- ✔✔to
prevent corrosion
How many cubic feet is 1 Litre of water? - CORRECT ANSWER- ✔✔0.035ft³
what is the density of water? - CORRECT ANSWER- ✔✔62.41 lb/ft³
How many lbs are in a gallon? - CORRECT ANSWER- ✔✔8.33lbs
how many BTUh is water to steam (vaporization) - CORRECT ANSWER- ✔✔970btu
How many btu is Ice to water? (solidification) - CORRECT ANSWER- ✔✔144btu
what would cause a compressor crankcase to overheat? - CORRECT ANSWER-
✔✔Defective Piston Rings
What is the result of a TXV cap tube bulb being cracked? - CORRECT ANSWER- ✔✔the
compressor superheat would be too high
The RPM of a Fan increases the aMperage will ____________ and the Static pressure will
______________ - CORRECT ANSWER- ✔✔increase, increase
what refrigerants have glide? - CORRECT ANSWER- ✔✔Zeotropes
What do you replace when compressor valves fail? - CORRECT ANSWER- ✔✔Valve plate,
valve plate gasket, and head gasket
what will happen if you have a clogged strainer? - CORRECT ANSWER- ✔✔Compressor
Crankcase pressure will decrease
