Mohawk Basic AC and Refrigeration UPDATED Actual Exam Questions and CORRECT Answers
0 view 0 purchase
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller MGRADES. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.49. You're not tied to anything after your purchase.
