MOD C SEC 2 MID-TERM PREP

The reading from a wet-bulb thermometer ____.

The most basic heat gain and heat loss calculations are based solely on the ____ of the space being conditioned

Power to the control transformer is controlled by the conditioned area thermostat

Construction materials have a minor effect on the rate of heat transfer through the structural envelope

Duct systems can be plenum, extended plenum, reducing plenum, or perimeter loop

Airflow pressure in ductwork is measured in inches of ____.

A boot in a duct system is a fitting used ____.

In rotary compressors, the motor is cooled by ____.

A small amount of air is induced from the outside into the conditioner to keep the air from becoming ____.

The solar load on a structure is the heat gain resulting from the ____.

The sun shining on the panels and coils of the condensing section will lower the efficiency of the unit

A dirty condenser coil can lead to ____.

Galvanized sheet metal comes in several different thicknesses, called the ____________________ of the metal

It would be best interest to lower the "solar load," to locate most of the windows on the ____ sides of the house

Infiltration is the term used when referring to the air entering a structure ____.

Slant coils for downflow application are designed with a coil slant of usually ____________________°.

After refrigerant lines have been installed, they should be evacuated to a(n) ____ vacuum

body is comfortable when the heat produced in the body is equal to the heat lost to the surroundings

What two fasteners are used with sheet metal square and rectangular duct

The U-value and the _______________ are inverses of each other

Before system is evacuated, piping should be filled with nitrogen and a small amount of refrigerant, to be __ checked

When installing a split air-conditioning line set may be altered if the standard length was incorrect for installation

As the ____ increases, the rate of heat transfer from one side of the structure to the other will increase

The term ____ is used to describe walls or portions of walls that are below ground level

One of the most commonly used characteristics of building construction materials is the ____-value

There are different methods to calculate the heat gain on a structure based on the type of house and the number of wall

When an "A" coil is used in a horizontal application, the coil is laid on its side and a special __________________ pan

More than one evaporator coil circuit is used when ____.

heat content of infiltrated air of the same dry-bulb temp may vary from one part of the country to the other due too

The duct pressure equals the velocity pressure plus static pressure

The return duct portion of an air handling system never needs to be insulated.

If a material has an R-value of 30, then the corresponding U-value will be ____.

When fresh air is introduced through the air handling system, the process is called fresh air intake, or ________

Air-conditioning equipment will perform at its best efficiency when running at full load

An instrument that is commonly used on air distribution systems is the anemometer, or ____.

The dry-bulb temperature is the ____.

Appearance is a major drawback with what type of air-conditioning equipment?

the guideline typically applied to a house with only a refrigerator and a vented cooking surface is ____ Btu/h.

A popular material combination used in air-conditioning evaporators and condensers is ____.

An auxiliary drain pan under the unit is recommended when the evaporator is installed ____.

When removing the rubber plugs from a line set, the hiss indicates that the tubing is not leaking

The wet-bulb depression is ____.

The average core body temperature is ____________________°F.

Very little heat is lost through the roof

Water, in the form of low-pressure vapor, is suspended in the air and is called ____________________.

Introduction of forced ventilation in the winter heating season helps to raise the humidity level

The pressure in a duct system is measured in ____.

A trap in the condensate line prevents ____.

The typical gauge wire that is used in low voltage control circuits is ____________________ gauge

One drawback of using custom made, pre-fabricated duct sections is that ____.

total heat loss for a structure is sum of the heat losses by all construction elements that make up a structure

(n) ____ºF temperature difference from the inside to the outside of the duct is allowable before insulation

. In reciprocating compressors used in air conditioning, the motor is mainly cooled by ____.

When hanging a horizontal air handler, it should be pitched toward the drain port for proper condensate removal

structure has no attic, there should be sufficient insulation in the roof to minimize the heat gain in the space

The ____-value is typically used to rate the thermal resistance of insulation materials

Of the heat produced in the human body, which is by perspiration?

What two fasteners are used with fiberglass ductboard

2 important factors that affect the U value of a below grade wall are

If the dry-bulb temperature is 76°F and the wet-bulb temperature is 68°F, the wet-bulb depression is _______________ F

A(n) ____ can be connected to measure the velocity pressure of the air moving in a duct

The main drawback of the extended plenum system is that the velocity of the air is lower as the air reaches last takoffs

A compressor that uses a stationary vane is the ____________________ type

The heat transfer rate through a window is found through: ____.

Friction due to air rubbing the walls of the ductwork can be eliminated

Which of the values given below corresponds to a wall with the highest resistance to the pass of heat?

The density of air is the ____.

One reason for using an extended plenum system is to ____.

One purpose of a flexible duct connector in a duct system is to reduce the transmission of noise and vibration

The air temperature of the air off an evaporative cooler is ____.

The package air-conditioning system is ____ than the split system because it is completely factory assembled and charged

Oversized duct systems cost more to fabricate, install, also result in the slowing of the air

The ____ provides the pressure difference needed to force the air into the duct system

When exposed to salt air, ____ should be used for the screws to secure the sheet metal of cabinets of air conditioning

The dew-point temperature is the ____.

The temperature on both sides of an exterior wall is needed to help determine how much heat is entering the structure

The _____________________-value describes the thermal conductivity of a material

The generalized comfort chart can be used as a basis to ____.

The reason for using a reducing plenum system is to ____.

Application of acoustical lining to the interior of a duct is accomplished by using tabs, glue, or both

When it comes to sizing air conditioning and heating equipment bigger is definitely better

The supply duct portion of an air handling system needs to be insulated when run through an unconditioned space

If the wet-bulb and dry-bulb temperature are both 80°F, what is the humidity

compressor equipped with a start capacitor and relay, it is probably using a TXV as a metering device

Comfort can be described as the gentle balance between ____.

moisture content of the air in different locations of the country must be taken into account when selecting equipment

heat gain on a structure can be summarized as the sum of conduction loads, internal loads, solar loads, infiltration

body is at rest (sitting) and in surroundings of ____________________°F and 50% humidity

____ used at the end of a metal duct run will help reduce any noise that may be traveling through the duct.

The density of water is ____.

The total heat loss for the basement walls is the product of the heat losses for the below-grade and above-grade walls

What fastener is commonly used with round flexible duct?

High-efficiency condensers ____.

Three types of expansion devices are used in residential air conditioning systems.They are TXV, capillary tube, and ___

The atmosphere exerts a pressure of ____ at standard atmospheric conditions

On a package air-conditioning system, which refrigerant lines must be field-installed

The rate at which water evaporate from the wick on the wet-bulb thermometer is determined by the moisture content of air

The occupants of a house do not add to the heat gain of the structure

A good way to fasten acoustical lining to the inside of sheet metal duct is to use ____.

Air consists of approximately 78% ____________________, 21% oxygen, and 1% other gases