Question 1

Refrigeration systems that use nothing more than a thermostatically controlled solenoid valve feeding a distribution system can use ____________________ or carbon dioxide as their refrigerant.

Accepted Answer

The answer of Refrigeration systems that use nothing more than...

Question 2

At extremely low evaporator temperatures, the compression ratio for the compressor becomes too great for single-stage refrigeration .

Accepted Answer

A) True 
 B)False

Question 3

Cold plates are usually filled with a ____.

Accepted Answer

A)   brine solution
B)   eutectic solution
C)   sodium chloride or calcium chloride solution
D)   All of the above.

Question 4

When products need to be cooled during flight, ice or ____________________ is used .

Accepted Answer

The answer of When products need to be cooled during...

Question 5

Truck refrigeration systems are designed to have the capacity to ____ .

Accepted Answer

A)   refrigerate a load that is not down to temperature
B)   refreeze a load that has thawed
C)   hold the load temperature when in transit
D)   All of the above.

Question 6

A system that uses two or more refrigeration systems working at the same time and exchanging heat between them to produce ultra-low temperatures, is called a(n) ____________________ system .

Accepted Answer

The answer of A system that uses two or more...

Question 7

The axle-driven refrigeration unit is a new system very commonly used in today's railway refrigeration .

Accepted Answer

A) True 
 B)False

Question 8

Dry ice is composed of ____.

Accepted Answer

A)   liquid nitrogen
B)   liquid carbon dioxide
C)   solidified carbon dioxide
D)   solidified ammonia

Question 9

Because of the large capacities of refrigeration systems installed in trucks, the trucks themselves do not need to be insulated from outside ambient temperatures.

Accepted Answer

A) True 
 B)False  False

Question 10

Some products, such as chicken, are dip frozen in a very cold solution of brine, in the first stage of the freezing process. Why ?

Accepted Answer

This prese...

Question 11

Why is the quality of meats frozen in a home freezer inferior to that of commercially frozen meats ?

Accepted Answer

A home freezer does not freeze...

Question 12

Nitrogen changes from a liquid to a vapor at ____.

Accepted Answer

A)   212°F
B)   -21°F
C)   -320°F
D)   -479°F C

Question 13

Seawater-cooled condensers for marine use have ____ .

Accepted Answer

A)   removable water box covers
B)   water circulating in the tubes
C)   tubes that are accessible for cleaning using a brush
D)   All of the above.

Question 14

The blast freeze method is done at very low temperatures and a high air   ____________________ .

Accepted Answer

The answer of The blast freeze method is done at...

Question 15

Ammonia is extremely toxic to humans and must be used with care.  When working with ammonia systems it is often necessary for the technician to wear ____ .

Accepted Answer

A)   gogles
B)   breathing apparatus
C)   protective clothing
D)   All of the above.

Question 16

The process where a solid changes directly to a vapor without first becoming a liquid is called ____________________.

Accepted Answer

The answer of The process where a solid changes directly...

Question 17

In order to keep dry ice in the solid form, the temperature of its surroundings can be ____.

Accepted Answer

A)   30°F
B)   -41°F
C)   -100°F
D)   -125°F

Question 18

Water-cooled condensers using sea water are usually designed and built to permit periodic cleaning by ____ .

Accepted Answer

A)   brushing the tubes
B)   acid treatment
C)   back finishing
D)   All of the above.

Question 19

In some applications of truck refrigeration, a liquid refrigerant is sprayed directly into the truck box to maintain low temperatures. The liquid refrigerant used is ____.

Accepted Answer

A)   oxygen
B)   nitrogen
C)   R22
D)   ammonia

Question 20

The system of shipping refrigerated trucks loaded on railcars is known as "____________________ ."

Accepted Answer

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Exam 28: Special Refrigeration Applications

Refrigeration systems that use nothing more than a thermostatically controlled solenoid valve feeding a distribution system can use ____________________ or carbon dioxide as their refrigerant.

Correct AnswerverifiedShow Answer

At extremely low evaporator temperatures, the compression ratio for the compressor becomes too great for single-stage refrigeration .

Correct AnswerverifiedShow Answer

Cold plates are usually filled with a ____.

Correct AnswerverifiedShow Answer

When products need to be cooled during flight, ice or ____________________ is used .

Correct AnswerverifiedShow Answer

Truck refrigeration systems are designed to have the capacity to ____ .

Correct AnswerverifiedShow Answer

A system that uses two or more refrigeration systems working at the same time and exchanging heat between them to produce ultra-low temperatures, is called a(n) ____________________ system .

Correct AnswerverifiedShow Answer

The axle-driven refrigeration unit is a new system very commonly used in today's railway refrigeration .

Correct AnswerverifiedShow Answer

Dry ice is composed of ____.

Correct AnswerverifiedShow Answer

Because of the large capacities of refrigeration systems installed in trucks, the trucks themselves do not need to be insulated from outside ambient temperatures.

Correct AnswerverifiedFalse

Some products, such as chicken, are dip frozen in a very cold solution of brine, in the first stage of the freezing process. Why ?

Correct AnswerverifiedThis prese...View AnswerShow Answer

Why is the quality of meats frozen in a home freezer inferior to that of commercially frozen meats ?

Correct AnswerverifiedA home freezer does not freeze...View AnswerShow Answer

Nitrogen changes from a liquid to a vapor at ____.

Correct AnswerverifiedC

Seawater-cooled condensers for marine use have ____ .

Correct AnswerverifiedShow Answer

The blast freeze method is done at very low temperatures and a high air ____________________ .

Correct AnswerverifiedShow Answer

Ammonia is extremely toxic to humans and must be used with care. When working with ammonia systems it is often necessary for the technician to wear ____ .

Correct AnswerverifiedShow Answer

The process where a solid changes directly to a vapor without first becoming a liquid is called ____________________.

Correct AnswerverifiedShow Answer

In order to keep dry ice in the solid form, the temperature of its surroundings can be ____.

Correct AnswerverifiedShow Answer

Water-cooled condensers using sea water are usually designed and built to permit periodic cleaning by ____ .

Correct AnswerverifiedShow Answer

In some applications of truck refrigeration, a liquid refrigerant is sprayed directly into the truck box to maintain low temperatures. The liquid refrigerant used is ____.

Correct AnswerverifiedShow Answer

The system of shipping refrigerated trucks loaded on railcars is known as "____________________ ."

Correct Answerverifiedpiggyback

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False

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This prese...
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A home freezer does not freeze...
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C

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