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PIPE > Chapter 14 (REFRIGERATION) > Flashcards

Chapter 14 (REFRIGERATION) Flashcards

1
Q

Which of the following could be used to check a leak in ammonia system?

A

Litmus Paper
Sulfur Stick

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2
Q

Ammonia leaks in the condenser can be detected by

A

Applying litmus paper to the circulating water discharge

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3
Q

A sulfur stick burning in the presence of ammonia will give off a

A

dense white smoke

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4
Q

An ammonia leak will turn litmus paper

A

blue

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5
Q

In an ammonia system the oil gauge must be kept:

A

closed except when checking oil level

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6
Q

Valves and piping 8n ammonia system are made of:

A

iron

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7
Q

The relief valve in an ammonia machine is located:

A

in the compressor head

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8
Q

When purging an ammonia condenser into a bucket of water, one can tell when the air is out and ammonia starts to come through by the:

A

change of bubbling sound of air to the crackling sound of ammonia

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9
Q

The crossover connection in an ammonia system can be used to

A

hot gas defrost

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10
Q

How is an ammonia system purged so that operator will not be overcome by the fumes?

A

into a bucket of water

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11
Q

Thermal expansion valves are usually of the:

A

diaphragm
bellows type

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12
Q

When checking zinc plates in a condenser, one should:

A

clean the plates snd renew worn out ones

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13
Q

The scale trap is located between the:

A

king (liquid) valve snd expansion valve

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14
Q

When the evaporator coils are located in the icebox, the system is known as

A

direct system

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15
Q

The purge valve is located:

A

in the highest part of the system

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16
Q

The solenoid valve is:

A

a temperature controlled stop valve

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17
Q

The thermal expansion valve is located between the:

A

solenoid valve and the evaporator coils

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18
Q

The purpose of scale trap is to:

A

remove dirt, scale and metal chips from the refrigerant

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19
Q

The oil separator (trap) is located between the:

A

compressor discharge valve and the condenser

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20
Q

The charging connection in a refrigerating system is located:

A

between the king valve and the solenoid valve

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21
Q

The dehydrator is located between the

A

receiver and the expansion valve

22
Q

The charging valve is located between the

A

king valve and the expansion valve

23
Q

The solenoid valve is located between the

A

scale trap and the thermal expansion valve

24
Q

A device used to keep moisture from passing through the system is called

A

dehydrator

25
Q

The relief valve is located on the

A

discharge side of the compressor

26
Q

The dehydrator is used:

A

to remove moisture from the system
when adding refrigerant to the system

27
Q

Which of the following is another name for liquid valve?

A

king valve

28
Q

If no gaskets are used in the piping joints of a Freon system, the joints must be:

A

ground joints

29
Q

A device for holding open the suction valve snd drawing gas from the suction manifold snd returning it to the suction line without compressing it is called

A

cylinder unloader

30
Q

The solenoid valve can be typed as

A

magnetic stop valve

31
Q

The bulb for thermal expansion valve is located

A

near the evaporator coil outlet

32
Q

The elements of a thermostat switch are usually of the

A

bimetal type

33
Q

The expansion valve is located between the

A

receiver snd evaporator

34
Q

The oil separator is located between the

A

compressor and condenser

35
Q

Zinc rods are found in the

A

salt water side of condenser

36
Q

A double trunk piston is used to

A

all of the above

37
Q

Which of the following gasket materials should be used on a Freon system?

A

Asbestos
Metallic

38
Q

Many pressure gauges on a Freon System have two dials or graduations on one gauge. The two dials represent

A

pressure and temperature

39
Q

A double type condenser has

A

a small pipe inside s larger pipe, the cooling water passing through the small pipe and the refrigerant through the large pipe

40
Q

When there is a freon leak, the halide torch will burn

A

green

41
Q

Large leaks in a Freon system cannot always be detected with a halide torch because ir changer color with the slightest amount of freon present. A large leak can be detected easier by applying

A

a soapsuds solution, mixed with a little glycerin at to hold the solution together, and watch for bubbles

42
Q

The relief valve on a CO2 machine is located

A

on the discharge pipe between the compressor and the discharge valve

43
Q

The discharge pressure of the compressor should be

A

the pressure which corresponds to a temperature from 5°F to 15°F higher than the condenser discharge

44
Q

The purpose if relief valves on regrigeration machines is to:

A

prevent excessive pressure in case of stoppage on the discharge side of the system

45
Q

A leaky suction valve can usually be detected by

A

any of the above

46
Q

Too low suction pressure could be caused by

A

any of the above

47
Q

What do you call a system in which the evaporator coils are located in a brine solution and the brine is pumped through the icebox?

A

an indirect system

48
Q

Before securing a compressor to do maintenance work in it, be sure to

A

purge the system
pump down the system

49
Q

Obstruction of the expansion valve us usually caused by

A

any of the above

50
Q

Excess frost on the evaporator coils

A

reduces efficiency of the plant

51
Q

Air circulation in the icebox is accomplished by the use of which of the following?

A

diffuser fans

52
Q

The cooling water side of the condenser should be opened for inspection every

A

three months

PIPE (17 decks)

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