Chapter 16 Installation of HVACR Systems

1. Which of the following characteristics apply to copper being used as a conductor?

• a. good mechanical strength

• b. ability to resist corrosion

• c. easily joined together

• d. all the choices are correct

2. Which of the following is a disadvantage of using aluminum wire?

• a. conduction of electricity

• b. corrodes easily

• c. thicker insulation necessary

• d. cost

3. What are the four factors that should be considered in sizing circuit conductors?​ ​ ​ (a)   ​ (b)   ​ (c)   ​ (d)  

• ampacity
• voltage drop
• insulation type
• safety
• wire color
• wire type
• voltage

True or False: Voltage drop can be calculated by E = IR.

• True

• False

5. 5. A disconnect switch is a switch used to break the electrical power supply to a load.

• True

• False

6. The most popular conductor used in the industry is __________.

Match the following

7. On what application would you use the following types of electrical enclosures?

a. general duty

b. waterproof

c. explosion proof

type the correct letter to match.

• b

• in areas where moisture exists

• c

• in areas where no moisture or explosive fumes exist

• a

• in areas where explosives exist

8. What is the difference between a fusible disconnect switch and a nonfusible disconnect switch?

• A fusible disconnect switch has fuses, while a non-fusible is only a switch.

• A non-fusible disconnect switch has fuses, while a fusible is only a switch.

9. What determines the type of insulation surrounding the conductor?

• a. application

• b. size

• c. number of conductors

• d. none of the choices are correct

10. How many hot legs would a three-pole breaker supply to an appliance?