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RMO REVIEW 1 > RMO Final 2 > Flashcards

RMO Final 2 Flashcards

1
Q

The advantage of forced draft cooling tower over natural draft cooling towers is:

Smaller tower size

That it uses less water

That it improves power
efficiency in water tower

Reduced energy cost

A

Smaller tower size

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2
Q

Which of the following best describes the purpose of a Halide torch?
Heat, copper and brass fittings for soldering

A safety light

To Locate CO2

To Locate Freon leaks

A

To Locate Freon leaks

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3
Q

When using a halide torch to test for a strong leak in a Freon system the color of the flame will
turn?

Pink

Blue

Green

Yellow

A

Blue

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4
Q

Which of the following refrigerants are designated 718?

Propane

Ammonia

Water

Air

A

WATER

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5
Q

One of the following refrigerants has operating pressures that exceed 1000 PSIG:

Ammonia

Sulfur dioxide

R-114

R-744

A

R-744

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6
Q

Which of the following best describes R-22?

Toxic

Boiling point at O PSIG equal to -21 degrees Fahrenheit

Odorless and Colorless

Leaks detected with Nessler’s solution

A

Odorless and Colorless

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7
Q

Which refrigerant does the number 744 designate?

Ammonia

CO2

R-12

Water

A

CO2

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8
Q

Which of the following best describes the volume of a refrigerant, as its operating pressure decreases?

Increases

Decreases

Stays the same

Is affected by atmospheric pressure

A

Increases

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9
Q

An R-12 system is mistakenly charged with R-22. What possible affect will it have on the system?

Damage the expansion valve

Overload the compressor motor

Overheat the evaporator

Provide insufficient sub-cooling

A

Overload the compressor motor

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10
Q

How many BTU’s must be added to one pound of water in order to vaporize the entire quantity?

144

970

1310

1

A

970

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11
Q

Which of the following is used to measure sensible heat?

Psychrometer

Pressure gauge

Thermometer

Ohm meter

A

Thermometer

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12
Q

Which of the following is needed to change the state of substance?

Superheat

Sensible heat

latent heat

Radiation

A

latent heat

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13
Q

Which form of heat transfer requires physical contact?

Radiation

Conduction

Evaporation

Convection

A

Conduction

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14
Q

Two refrigerating systems (A+B) are each absorbing 800 BTU’s per minute in their evaporators. System “A” has an evaporator temperature of 15 degrees Fahrenheit with a corresponding pressure of O PSIG. System “B” has an evaporator temperature of 35 degrees Fahrenheit with a corresponding pressure of 17 inches of mercury. What are the capacities of these two systems?

System A is 2 tons, System B is 6 tons

System A is 6 tons, System B is 2 tons

System A is 4 tons, System B is 4 tons

System A is 5 tons, System B is 3 tons

A

System A is 4 tons, System B is 4 tons

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15
Q

Which latent heat is added or removed from a substance, which of the following remains constant?

Pressure

Temperature

BTU content

Physical state

A

Temperature

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16
Q

Convert 10 PSIG to the corresponding pressure in PSIA:

15

20

30

24.7

A

24.7

17
Q

The units of pressure indicated on a compound gauge are:

Pounds of atmospheric pressure

Inches of mercury above atmospheric pressure

Inches of pressure

Pounds per square inch above atmospheric pressure, inches of vacuum below atmospheric pressure

A

Pounds per square inch above atmospheric pressure, inches of vacuum below atmospheric pressure

18
Q

The unit of vacuum indicated on a compound gauge is:

Inches of water

Feet of water

Microns

Inches of mercury

A

Inches of mercury

19
Q

Which of the following values of pressure is not equivalent to atmospheric pressure?

A barometric reading of 29.92” Hg

0 PSIG

14.7 PSIA

29.9 inches of vacuum

A

29.9 inches of vacuum

20
Q

Which of the following units of pressure are considered absolute values?

PSIG & PSIA

“Hg (barometric) & “Hg (vacuum)

PSI & PSIG

PSIA & “Hg (barometric)

A

PSIA & “Hg (barometric)

21
Q

What effect will moving to a higher elevation have on barometric readings?

Increased pressure

Decreased pressure

No change

20% increase

A

Decreased pressure

22
Q

Water tube leaks in a low-pressure chiller can be found by:

Thermographic test

Circulating Nessler’s solution

Hydrostatic Test

Dielectric Test

A

Hydrostatic Test

23
Q

When an air conditioning system is operating efficiently, the finned coils of the evaporator should be:

Dry

Wet

Frosted

Partly frosted

A

Wet

24
Q

Which of the following would be considered a benefit associated with indirect refrigeration systems?

Less cost to erect

Less cost to operate

East of operation

Building occupant safety

A

Building occupant safety

25
Q
  1. In a particular Freon compression system, the compressor is running continuously. How will the
    suction pressure be affected as the evaporator load decreases?

Increase

Decrease

Remain steady regardless of changes in the load

First decrease and then steadily increase

A

Decrease

26
Q

What type of refrigeration system is mostly likely to leak into the building spaces that are being cooled?

Indirect systems

Direct systems

Indirect closed systems

Cascade systems

A

Direct systems

27
Q

Which of the following best describes how an evaporator absorbs heat from air or water?

Heat is conducted from the air or water to the refrigerant

Heat is conducted from the refrigerant to the air or water

Refrigerant boils to a low pressure gas

Refrigerant boils to a high pressure gas

A

Refrigerant boils to a low pressure gas

RMO REVIEW 1 (11 decks)

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