HVAC/ AC&R

Question 1

75/25 is the typical percentage ratio of ________ to replenished air in a partially replenished ventilation system.

Answer 1

recirculated

Question 2

Cubic Feet per minute measurement is the amount of air to be _______ at each ventilation outlet calculated.

Answer 2

delivered

Question 3

Fin Comb can be used to help repair______ coil fins.

Answer 3

damaged

Question 4

The most common ________ refrigerants used in the Coast Guard are water, brine and antifreeze.

Answer 4

secondary

Question 5

The fusible plug on a refillable refrigeration cylinder _____ at 165oF.

Answer 5

melts

Question 6

Never refill a ______ cylinder over 80% full.

Answer 6

refrigerant

Question 7

Compression, condensation, ______ and evaporation are the four stages of a basic refrigeration cycle.

Answer 7

expansion

Question 8

The four major types of compressors are ________, rotary, scroll and centrifugal.

Answer 8

reciprocating

Question 9

The three common types of air cooled condensers are Fin and Tube, Wire Static, and _____ Plate.

Answer 9

Static

Question 10

The purpose of a metering device is to meter the correct amount of ________ moving to the evaporator.

Answer 10

refrigerant

Question 11

Any technician opening a system must be properly certified in accordance with 608 of the ________ _______ Act.

Answer 11

Clean Air

Question 12

Disposable and reusable filters are designed to _____ 90 percent of the dust particles if maintained properly.

Answer 12

remove

Question 13

No work can be done on energized circuits before obtaining the approval of the _______

Answer 13

commanding officer.

Question 14

Electrons have a ___________ charge (-), protons have a positive charge (+), and neutrons are neutral.

Answer 14

negative

Question 15

Materials that permit many ________ to move freely are called conductors

Answer 15

electrons

Question 16

Materials that allow only ______ electrons to move freely are called insulators

Answer 16

few