Mohawk Basic AC and Refrigeration UPDATED Actual Exam Questions and CORRECT Answers
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Course
Mohawk
Institution
Mohawk
Mohawk Basic AC and Refrigeration
UPDATED Actual Exam Questions and
CORRECT Answers
A ton of refrigeration or air conditioning capacity is equal to: - CORRECT ANSWER- c.
12000 british thermal units in one hour
If 14.7 lbs is the absolute pressure, what is the gauge pressure? - CORRECT ANSWER...
Mohawk Basic AC and Refrigeration
UPDATED Actual Exam Questions and
CORRECT Answers
A ton of refrigeration or air conditioning capacity is equal to: - CORRECT ANSWER✔✔- c.
12000 british thermal units in one hour
If 14.7 lbs is the absolute pressure, what is the gauge pressure? - CORRECT ANSWER✔✔-
b. 0 PSIG
R-12 boils at what temperature? - CORRECT ANSWER✔✔- c. -21.7 Fahrenheit
Suction lines are usually sized for: - CORRECT ANSWER✔✔- c. 2 degrees temperature
change
A refrigerant gauge and testing manifold has: - CORRECT ANSWER✔✔- d. 2 gauges, 2
valves, and 3 ports
A fan motor runs at 1800 RPM under load. It has a 3 inch pulley and drives a fan equipped
with a 9 inch pulley. What is the fan speed? - CORRECT ANSWER✔✔- a. 600 RPM
Locked rotor current is usually: - CORRECT ANSWER✔✔- c. 4-6 times the run current.
What resistance is there in a good, usually closed relay contacts? - CORRECT
ANSWER✔✔- a. 0 ohms
The boiling point of ammonia at atmospheric pressure is: - CORRECT ANSWER✔✔- d. -28
degrees F
The we bulb temperature is the same as the dry bulb when you have: - CORRECT
ANSWER✔✔- d. 100% RH
, The total capacitance of two 100 uF capacitors connected in series is: - CORRECT
ANSWER✔✔- b. 50 uF
In transferring refrigerant from one cylinder to another, it is a good idea to avoid filling the
cylinder more than _____ % full. - CORRECT ANSWER✔✔- c. 80%
The B-52 mechanical code states that liquid receivers or parts of a system designed to receive
the refrigerant charge during pumpdown shall be filled to no more than: - CORRECT
ANSWER✔✔- c: 90% at 32 celcius
How much heat must be removed to cool 1000 lbs of water from 72 degrees Fto -18 degrees
F? - CORRECT ANSWER✔✔- c. 209,000 BTH
Which of the following is the rankine scale for absolute zero? - CORRECT ANSWER✔✔- a.
0
A lamp has a source voltage of 110 volts and a current of 0.9 amps. What is the resistance of
the lamp? - CORRECT ANSWER✔✔- b. 122.22 ohms
What are the basic voltages that can be taken off of a 4 wire 208 volt system? - CORRECT
ANSWER✔✔- b. 208/3/60 and 208/120/1/60
Checking the secondary voltage of a transformer, you find the output is 24 volts and 20 amps.
The turns ratio of the transformer is 5:1. Determine the voltage and amperage of the primary.
- CORRECT ANSWER✔✔- a. 120 volts, 4 amps
As a "rule of thumb" what CFM of air through the evaporator is required per ton of air
conditioning? - CORRECT ANSWER✔✔- b. 400 CFM
You find a "blown" start capacitor marked 330 volts - 140 uF. You have the following sets of
capacitors on your truck. Which one of these sets would you use as a replacement? -
CORRECT ANSWER✔✔- b. 440 volts- 40 uF and 550 volts- 100 uF
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