HVAC 1 Mod 5 Review Questions

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10

5lb of water heated to raise the temperature 2*F requires how many BTU's?

discharge pressure

A TXV regulates the flow of refrigerant to the evaporator to maintain a consistent _______.

reciprocating compressor

A compressor with a piston that travels back and forth in a cylinder is a _______.

from a higher pressure to a lower pressure

A gas or a liquid always flows _____.

hygroscopic

A substance that attracts and absorbs moisture from the air is referred to as being _____.

changing it's resistance to electrical flow

A thermistor responds to temperature changes by _____.

counterflow towers

Forced-draft cooling towers in which the air flow is forced up from the bottom as water trickles down are called ______.

rose

HFC-410A refrigerant comes in a disposable container that is painted ___.

72*F(22*C)

If a gas is superheated 15*F(8.3*C) to a temperature of 87*F(31*C), we can determine that its boiling point is _____.

evaporator

In a refrigerant circuit, the low pressure, low temperature liquid is converted into a low-pressure, low-temperature vapor in the _____.

compressor

Ina refrigeration system, the low-pressure, low-temperature vapor is converted into high-pressure, high-temperature vapor by the _____.

50

OSHA establishes the maximum exposure to ammonia vapors at 5 minutes to a concentration of how many parts per million(ppm)?

time clock

One clear example of a secondary control ____.

centrifugal

Reciprocating compressors can be found in any of the following configurations except _____.

can be measured by a thermometer

Sensible heat is heat that __________.

after all of a solid changes to a liquid

Super heat can be gained _______.

212

The Fahrenheit scale is based on the temperature water boils at sea level, which is ___*F.

accumulator

The accessory found only in the refrigeration circuit suction line is the _____.

size of the opening and the pressure applied

The amount of refrigerant flow through a fixed-orifice metering device is dependent upon the _____.

as the pressure is decreased

The boiling temperature of a liquid is decreased ____.

the fluorocarbon always has fluorine in it, but not all halocarbons do

The difference between a halocarbon and a fluorocarbon refrigerant is that ______.

HFCs

The fluorocarbon refrigerants that are least harmful tot the ozone layer are the ______.

inlet of the comprpessor

The low side of the refrigeration system include the _____.

remove heat from the refrigerant

The main purpose of a condenser is ____.

transfer heat into the refrigerant

The main purpose of an evaporator _____.

maintain a predetermined liquid level

The metering device for a flooded evaporator is designed to ____.

-

The operation of a double-suction riser depends on ______.

conduction

The transfer of heat from one object to another by direct contact is called ____.

a fusible plug responds to high pressures; a rupture disk responds to high temperatures

What is the difference between a fusible plug and a rupture dish?

grey with yellow shoulders

What is the required color code for refrigerant recovery cylinders?

subcooled

When the temperature of a liquid refrigerant is below its condensing temperature, the liquid is _______.

liquid line

Which primary refrigerant line is considered the least critical in its layout and installation?

receiver

Which refrigerant circuit accessory provides a place to store the system refrigerant charge during service procedures or prolonged shut downs on larger systems?

infrared heating systems

Which type of heating unit or system is based on radiation?

14.7

Zero gauge pressure (0 psig) corresponds on the absolute scale to ____ psia.

ammonia

_______ is slightly more efficient at transferring heat that halocarbon refrigerants.


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