Deck 26: Application of Refrigeration Systems

Question 1

The air used for "pneumatic controls" must be ____ .

A) hot
B) dry
C) moist
D) rectified

Answer 1

B

Question 2

One of the advantages of parallel compressor systems is ____ .

A) load matching
B) flexibility
C) less compressor cycling
D) All of the above.

Answer 2

D

Question 3

The primary advantage of parallel compressor systems is their ____.

A) higher efficiencies
B) nearly exact load matching ability
C) smaller locked-rotor amperage
D) limited effect of a compressor malfunction

Answer 3

B

Question 4

Heaters that are made with resistance-type wire run just under the surface of the cabinet are called ____ heaters .

A) anticipation
B) relief
C) mullion
D) reclamation

Question 5

In a kitchen, ____ condensing units may be easier to maintain.

A) self-contained
B) remote
C) local
D) hybrid

Question 6

Self-contained equipment normally plugs into either a 120-V or 230-V electrical outlet.

Question 7

Carbon dioxide (CO₂) is one of the newest refrigerants .

Question 8

The heat reclaim valve is a three-way valve that is activated by a solenoid operated by a ____ .

A) pilot
B) reload
C) preload
D) pressure

Question 9

An open case is more efficient than a closed case.

Question 10

Often, parallel compressor systems employ a satellite or booster compressor .

Question 11

When purchase cost alone is considered in selecting refrigeration equipment, the equipment may not perform acceptably .

Question 12

The most popular secondary fluid currently used in refrigeration systems is ____ .

A) HFE
B) ethylene glycol
C) HCFC
D) propylene glycol

Question 13

One of the disadvantages of the secondary-fluid refrigeration systems is ____ .

A) greater leak potential
B) more critical piping
C) longer defrost periods
D) higher cost of the equipment

Question 14

In condensate removal, the drain lines should be sloped downward about ____ in. per foot for proper drainage.

A) 1/8
B) 1/6
C) 1/4
D) 1/2

Question 15

The precharged tubing used for installing refrigeration piping is called a ____ .

A) line set
B) gauge set
C) log set
D) completion set

Question 16

Refrigerated compressed air driers typically run ____% of the time .

A) 30
B) 50
C) 80
D) 100

Question 17

At its triple point, CO₂ can exist as ____ .

A) vapor
B) liquid
C) solid
D) All of the above.

Question 18

Knock-down walk-in coolers are constructed of interlocking panels from ____ thick .

A) 1 in. to 4 in.
B) 1 in. to 6 in.
C) 2 in. to 4 in.
D) 2 in. to 6 in.

Question 19

The three-way heat reclaim valves in most heat reclaim systems are ____ operated.

A) relay
B) contact
C) switch
D) solenoid

Question 20

When a parallel heat reclaim system is used, the heat reclaim condenser must be sized to handle ____% of the refrigeration system's rejected heat when in the heat reclaim mode.

A) 50
B) 70
C) 80
D) 100

Question 22

Why is the hot gas bypass valve in a refrigerated air drier called a pressure regulator ?

Question 23

Explain what pilot operation means.

Question 24

The precharged tubing for refrigeration piping is ____________________ at both ends and has quick connect fittings .

Question 25

____________________ are basically refrigeration systems located in the air supply, after the storage tank.

Question 26

What are the two alternative means of disposing of the condensate that is gathered on the evaporator of all refrigeration equipment ?

Question 27

Distributed supermarket refrigeration modules that are located very close to the display cases they refrigerate are becoming increasingly popular .

Question 28

All refrigeration equipment must have some means for disposing of the ____________________ that is gathered on the evaporator.

Question 29

When the inside of the evaporator cabinet is below freezing, heat has to be provided to keep the condensate in the line ____________________ .

Question 30

Where can a condensing unit be located?

Question 31

Retail stores use ____________________ refrigeration units for merchandising their products.

Question 32

How are the normal condenser and the heat reclaim condenser used when in the heat reclaim mode in a series heat reclaim system ?

Question 33

CO₂, ammonia, propane, butane, and isobutane are all natural refrigerants .

Question 34

Refrigerated air driers are normally self-contained refrigeration systems that may be air cooled or water cooled.