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Minnesota-Refrigeration Online Practice Test

These are actual questions from our online practice test.

We have included a question from each chapter of the test. Every question will be multiple choice. The answers are not included with the sample.

Sample Questions

# Chapter Title Question
1 Condensers and Compressors

Why is the suction line back to the compressor  insulated?

2 Condensers, Compressors, Water, Gas and Temperatures Compressor capacity __________, when suction pressure decreases.
3 Evaporator and Metering Devices Flash gas forms in the __________.
4 Controls, Servicing Tools, Refrigeration Accessories and Installations Unless it __________, refrigerant must not be installed vertically through flooring between stories.
5 Refrigerant, Toxic Chemicals and Mixing Chemicals

Where would the oil trap be installed on a refrigeration system?

6 Refrigerant, Freon, Variety of Brine and Leaks The enthalpy of the saturated liquid less the enthalpy of the gas equals the latent heat.
7 Refrigeration Systems and Design Any system where the basic design is such that a leakage of refrigerant from a failed connection, seal, or component may enter the area is a __________ system.
8 Testing Symbols and Refrigerant Oil EPA classification Type 1 =
9 Troubleshooting, Startup, Testing and Maintenance If air or non-condensables are in the system causing the compressor to start but cut out on overload and not start again until after several attempts, __________.
10 Circulation Systems Compression Chiller =
11 Piping and Combustion In reference to lines and piping, R-12, R-22, R-500 and R-502 liquid velocities are about 100 ft./min. Suction lines have about __________ ft./min.
12 Venting and Service A flue pipe can reach a temperature of 500 degrees F to __________ degrees F.
13 Absorption An intermittent absorption system is __________.
14 Different Types of Condensers, Compressors, Pressure and Cooling Systems Compressor capacity __________, when suction pressure decreases.
15 Evaporator, Metering Devices, Temperature, TEV, TXV and Valves Flash gas forms in the __________.
16 Condensers, Compressors, Oil, Gas, Crankcase, Discharging and Valves Packing in the stuffing box is __________.
17 Valve Systems and Refridgeration Theory Conduction is the transfer of __________.
18 Refrigeration Systems Dry Ice =
19 Equipment, Pressure Temperature and Math

The number N of bacteria in a refrigerated food is given by N(T) = 10T2 − 20T + 700, 1 ¡Ü T ¡Ü 20 where T is the temperature of the food in degrees Celsius. When the food is removed from refrigeration, the temperature of the food is given by T(t) = 5t + 2, 0 ¡Ü t ¡Ü 6 where t is the time in hours. (a) Find the composition N(T(t)). N(T(t)) = 1 , 0 ¡Ü t ¡Ü 6

Answer: N(t) = 10t^2 - 20t + 700 

N(T(t)) = 10T^2 - 20T + 700 
= 10(5t+2)^2 - 20(5t+2) + 700 
= 250t^2 + 100t + 700 

20 Miscellaneous Cryogenics
21 Osha, Safety, Asbestos, Code of Federal Regulations Title 29, Part 1926 and Fire Extinguishers

PACM means "presumed asbestos containing material". 

22 Employees, Contractors, Insurance, Safety and Dig Alert

NC 811 Dig Alert by law, requires at least __________ days notification and not more than __________ days.

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