When air contains all of the water vapor it can hold, it is said to be

What is the instrument used to register relative humidity?

Humidity is a measure of which of the following?

Air conditioning is the process of:

In an air-conditioning system, before the air is circulated to the required area it is:

The temperature at which water vapor in the atmosphere begins to condense is known as the:

Saturation temperature is the same as:

When the bypass factor is B, the coil efficiency for sensible cooling of air equal to:

The psychrometric chart in air conditioning determines the

Which of the following is considered as comfort condition in air conditioning?

The drift loss in cooling towers is about:

Cooling towers are used for cooling water:

By which of the following processes heat mainly dissipates in cooling towers?

Which one is commonly used liquid absorbent?

In sensible heating cooling following parameter remains unchanged

Heating and dehumidification can be obtained simultaneously if air passed through:

Dirt and foreign materials normally build-up on the side of the condenser tubes. To ensure adequate condenser capacity, a certain factor is used in calculating the overall heat transfer through the walls of the tubes including the heat transfer through the walls of the tubes including the heat transfer rate of the layers dirt and foreign materials. What is the factor?

The engineer was tested to design the air conditioning system for a ball room dance hall. Considering that this involve a lot of activity from its users, the engineer would design that will require:

What is the value of the Mach No. throat of the converging-diverging nozzle?

What do bodies at a temperature above absolute zero?

When air is saturated, the wet bulb depression is:

In a window air conditioning unit which if the following is done by the owner?

Fan motors in air conditioning units have:

Which of the following capacitors that can usually be found in an air conditioning unit?

Which of the following troubles commonly occurs inside an air conditioning unit?

The motor condition of an air conditioning unit can be checked with:

An air conditioning system wherein the entire systems are mounted in the cabinet:

The use of water to carry heat occupied spaces

The method of cooling which primarily used where ambient air temperatures are high and relative humidity is used:

The other name for Swamp Cooling is:

Evaporative Condenser is used to cool

A method of cooling which uses water as refrigerant. Pressure on the water surface is reduced to lower its boiling temperature.

Palladium Chloride may be used to measure the presence of:

The amount of CO can be determined by the color of Palladium Chloride. An amount of 30 ppm to 70 ppm will cause:

The term used to express the amount moisture in a given sample of air. It is compared with amount of moisture in a given sample of air.

How should the window type air conditioning unit can be placed?

A dehumidifier is usually a small hermitic refrigerating system. It has both a condenser and an evaporator. Many older systems use R-12 or R-500. The newer units use:

The normal cut-out setting of a window unit thermostat is between:

Thermostat are used with most window units. They have differentials which may vary between:

In an air conditioning unit, the thermostat fails. The unit did not start. How do you test the operation of the thermostat?

Which of the following dehumidifier is often used to reheat the air after moisture is removed?

Which of the following refrigerant is added sometimes to other refrigerant to improve oil circulation?

A refrigeration that deals with producing temperature of -157 degrees C or lower.

Measurement of a device's ability to remove atmospheric air from test air.

A liquid mixture having constant maximum and minimum boiling points. Refrigerants comprising this mixture do not combine chemically, yet the mixture provides constant characteristics.

Refrigerant in Group A1 (R-11). Chemical combination of carbon, chlorine, and flourine.

Which of the following refrigerants is popular in the industrial refrigerating system; also popularly absorption system of refrigerant.

Which of the following is a function of air conditioning?

Oxygen is approximately what percent by weight in the atmosphere?

Substances that have the ability to absorb moisture from the air are called:

When the dry bulb and the wet bulb temperatures are identical, the air is said to be:

In what form that water exists in air?

When air is heated, what happened to its relative humidity?

The horizontal Scale (abscissa) in the psychrometric chart represents:

Most people are comfortable with the relative humidity of:

The temperature below which vapor in the air will start to condense:

Which of the following is not used as method to measure air velocities?

It is a form of oxygen photochemically produced in nature.

What is the Chemical formula of Ozone?

In the upper atmosphere, ozone is made by ultraviolet light reacting with:

The ozone concentration of 0.10 parts per million (ppm) is generally considered the maximum permissible for how many hours exposure?

How many moisture be removed from air?

In cooling cycle, the dry bulb temperature (db) of the air is lowered. When this happens the relative humidity:

What is the effect of superheating the refrigerant?

In sensible heating the absolute humidity remains constant but the relative humidity:

The relative humidity becomes 100% and where the water vapor starts to condense.

Why should you avoid bending or twisting of fan blades in an air conditioning unit?

A type of refrigerant that will not damage the ozone layer.

Which of the following refrigerants damages the ozone layer?

Large bulb alcohol thermometer used to measure air speed or atmospheric conditions by means of cooling.

Which of the following components of the window air conditioning system must be cleaned annually?

The phenomenon that warm air rise and cold air settle is called:

Air delivered to the room from the supply duct, moving at a velocity of 150 ft/min is called:

Carries needed to deliver air to the conditioned space. It is made of metals like aluminum, galvanized sheet steel and some structural materials that will not burn.

From what principle that air ducts operate?

Which of the following is the common classification of ducts?

It is used deliver concentrated air streams into a room. Many have one-way or two-way adjustable air stream deflectors.

It is used to control air-throw distance, height, and spread, as well as the amount of air.

It is used to deliver widespread, fan shaped flows of air into the room.

Which of the following fans in air conditioning systems which can be classified as centrifugal flow?

The most common controller in the heating and cooling systems.

A thermostat that functions as increase or decrease instead of starting and stopping system is called:

A number used to compare energy usage for different areas. It is calculated by dividing the energy consumption by the footage of the conditioned area.

The ratio of the rated cooling capacity divided by the amount of electrical power used:

Heat exchanger in which water flows by gravity over the outside of the tubes or plates.

A popular air conditioning system that includes a single outdoor condenser, 3 independent evaporators, and individual evaporator temperature control. The condensing unit is located outside on a slab. They are frequently used in legal and medical offices, motels and homes without ducts.

An air conditioning system which is a combination of heating and cooling system. It is designed to serve an individual room or zone.

Which of the following is to be checked as regular monthly maintenance schedule of a console air conditioning units?

Which of the following is to be checked as part of the weekly maintenance schedule of a console air conditioners?

A mechanism that removes moisture.

When coil surface temperature is below the dew point of the air.

Nitrogen occupied almost how much of the Earth's Atmosphere.

Water in vapor form remains a vapor as long as its temperature is what relation to the dew point temperature.

An instrument used in measuring air velocity by velocity-pressure method.

What is the specific humidity of dry air?

When hot soup was served in a cup during dinner, an engineer was so eager to drink it. Since it was hot, he added ice cubes to cool the soup and stirred it. He noticed that dew starts to form on the outermost surface of the cup. He wanted to check the temperature of the outermost surface of the cup. What is this temperature equal to?

The temperature at which the water vapor in the gas begins to condense in a constant pressure process.

All of the following processes can be found on a psychrometric chart except:

All of the following processes can be found on a psychrometric chart except:

Which is not commonly used to cool and dehumidify equipment?

All of the following temperatures have meaning in psychrometrics except:

The relative humidity is given by the:

The determination of properties and behavior of atmospheric air usually the purview of:

Past ME Board Question: Which of the following statements is correct? The relative humidity of an air-water vapor mixture

Past ME Board Question: In sensible cooling process, moisture content.

Past ME Board Question: What amount of air is required in a low bypass factor?

Past ME Board Question: The design of an air supply duct of an air conditioning system _______.

Past ME Board Question: What is the lowest temperature to which water could possibly be cooled in a cooling tower?

Past ME Board Question: Combined process of cooling and humidifying is also known as:

Past ME Board Question: In a cooling tower, the water is cooled by:

Past ME Board Question: Which of the following types of air dryers works by absorbing moisture on a solid desiccant or drying material such as activated alumina, silicon gel, or molecular sieve?

Past ME Board Question: The relationship of water vapor in the air at the dew point temperature to the amount that would be in the air if the air were saturated at the dry bulb temperature is:

Past ME Board Question: When the air is saturated the wet bulb depression is:

Past ME Board Question: A temperature measurement in an ordinary thermometer which has constant specific humidity.

Past ME Board Question: During sensible heating, the humidity remains constant but the relative humidity.

Past ME Board Question: The relative humidity becomes 100% and where the water vapor starts to condense.

Past ME Board Question: What is the specific humidity of dry air?

Past ME Board Question: An engineer inspected an air-conditioning unit. He found out that the unit does not produce any cooling effect; however, the air-conditioning unit is running. He checked the temperatures of the condenser and evaporator and had the unit run. He found out that there was no change in the temperature. What should he do?

Past ME Board Question: What is the temperature range of air in air conditioning application where the dry air can be considered ideal gas?

Past ME Board Question: What is the value of air stratification in air conditioning design fit for human comfort?