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Hvac > EPA Type 3 > Flashcards

EPA Type 3 Flashcards

1
Q

What type of equipment can be worked on with Type III certification?

A High pressure

B Medium pressure

C Low pressure

D Vacuum pressure

A

C Low pressure

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2
Q 
When installing more than one pressure relief valves must be installed;
A in series.
B in parallel 
C in the suction line
D on top of compressor head
A

B in parallel

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3
Q 
The owner must keep records of refrigerant added during service and maintenance on equipment;
A with charges of 25 lbs or greater.
B with charges of 50 lbs or greater.
C with charges of 100 lbs or greater.
D with charges of 150 lbs or greater.
A

B with charges of 50 lbs or greater.

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4
Q 
After all the liquid has been removed from an average 350 ton approximately how much vapor refrigerant remains in the system?
A 100lbs
B 150lbs
C 350lbs
D 45lbs
A

A 100lbs

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5
Q 
When charging a system with a low pressure refrigerant should be introduced as a vapor to raise saturation temperature to a minim of;
A 0 degrees
B 36 degrees
C 40 degrees
D 70 degrees
A

B 36 degrees

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6
Q 
Where is the purge unit located in a low-pressure system?
A The top of the condenser
B In the lowest location.
C Above the shell
D Before the oil separator.
A

A The top of the condenser

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7
Q

In a chiller air and other noncondensables collect;
A at the bottom of the compressor.
B at the top section of the condenser.
C at the bottom of the evaporator.
D at the header before the metering device.

A

B at the top section of the condenser.

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8
Q 
A rupture disk for low pressure chiller will rupture at;
A 5 psig
B 10 psig
C 15 psig
D 20 psig
A

C 15 psig

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9
Q 
The Standard for machine room safety is;
A ASHRAE-15
B ASHRAE-34
C ARI-740
D EPA-740
A

A ASHRAE-15

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10
Q

Who establishes the refrigerant safety group standard.

A)ARI
B)UL
C)ASHRAE
D)ASE

A

C) ASHRAE

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11
Q

A low pressure chiller used for comfort cooling must be repaired if it has an annual leak rate of ____ of the total charge.

A)15 percent

B)20 percent

C)30 percent

D)50 percent

A

A)15 percent

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12
Q

ASHRAE 34 Standard Safety classifies R-134a as;

A)A1

B)A2

C)B1

D)B2

A

A)A1

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13
Q

Because a low-pressure system operates below atmospheric pressure (in a vacuum),

A)the system is unlikely to have air and moisture to enter the system.
B)leaks in the gaskets or fittings will cause air and moisture to enter the system.
C)leaks in the gaskets or fittings will cause substantial refrigeramt leaks.
D)leaks in the gaskets or fittings will cause oil clogging at the condenser.

A

B)leaks in the gaskets or fittings will cause air and moisture to enter the system.

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14
Q

To repair a chiller operating with R-22 the technician;

A)does not need a certification.

B)must have a Type I certification.

C)must have a Type III certification.

D)must have a Type II certification.

A

D)must have a Type II certification.

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15
Q

Which of the following refrigerants has a safety classification of B-1

A)CFC 12 (R-12)

B)HFC 134A (R134A)

C)HCFC 123 (R-123)

D)CFC 11 (R-11)

A

C)HCFC 123 (R-123)

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16
Q

During evacuation of systems with large amounts of water, it may be necessary to;

A)increase pressure by introducing nitrogen to counteract freezing.
B)purge the condenser.
C)drain the compressor.
D)decrease pressure by introducing nitrogen to counteract freezing.

A

A)increase pressure by introducing nitrogen to counteract freezing.

17
Q

When leak testing a low pressure chiller, the maximum pressure to use is;

A)5 psig.

B)10 psig.

C)15 psig.

D)20 psig.

A

B)10 psig.

18
Q

The most efficient method of leak checking a charged low-pressure refrigeration unit is to

A pressurize the system by the use of controlled hot water or heater blankets.

B pull a 500 micron vacuum and hold for about 12 minutes to see if it rises to 1,500 micron.

C pull to 20 inch vacuum and hold for about 24 hours without more than a 2 inch rise in pressure.

D pull to 29.9 inch vacuum and hold for about 24 hours without more than a 2 inch rise in pressure.

A

A pressurize the system by the use of controlled hot water or heater blankets.

19
Q

When pressurizing a system, do not exceed

A 5 psig

B 10 psig

C 15 psig

D 20psig

A

B 10 psig

20
Q

After reaching the required vacuum on an appliance when servicing, moisture is indicated by;

A complete rise from the vacuum to a positive pressure.

B multiple rises in pressure over a period of time with increase of pauses between rises.

C slow rises in pressure, and then a reduction of pressure over a period of time.

D a 500 micron measurement in the system at the shortest point to the vacuum pump.

A

B multiple rises in pressure over a period of time with increase of pauses between rises.

21
Q

EPA required evacuation levels for recovery or recycling equipment manufactured or imported before Nov. 15, 1993 is

A 15 inches Hg

B 20 inches Hg

C 25 inches of Hg

D 30 inches Hg

A

C 25 inches of Hg

22
Q

EPA required evacuation levels for recovery or recycling equipment manufactured or imported on or after Nov. 15, 1993 is

A 10 mm Hg absolute

B 15 mm Hg absolute

C 20 mm Hg absolute

D 25 mm Hg absolute

A

D 25 mm Hg absolute

23
Q

What can be used to pressurize a chiller system before opening the system for a non-major repair?

A Controlled hot water

B nitrogen

C refrigerant 409

D compressed air

A

A Controlled hot water

24
Q

Refrigerant recovery from a system using R-11 or R-123 starts with

A vapor removal and is followed by liquid recovery.

B liquid removal and is followed by vapor recovery.

C alternating between liquid and vapor phase of recovery.

D operating the compressor.

A

B liquid removal and is followed by vapor recovery.

25
Q

If a strong odor is detected during the recovery process,

A the refrigerant is most likely R717 (Amonia)

B the purge unit has activated

C a compressor burn-out may have occurred

D it is a good indicator that R123 is the refrigerant being recovered

A

C a compressor burn-out may have occurred

Hvac (18 decks)

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