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Modern Refrigeration and Air Conditioning, 21st Edition by Althouse - Chapters 1-55
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Modern Refrigeration and Air Conditioning, 21st Edition by Althouse - Chapters 1-55
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Test Bank: Modern Refrigeration and Air Conditioning,21st Edition by Althouse - Chapters 1-55,
9781635638776 | Rationals Included
Fluids absorb heat while changing from a liquid state to a vapor state and give up heat in changing
from a vapor to a _________ _______. - ANSWER: liquid state
The temperature at which a change of state occurs is constant during the change provided the
pressure remains _________. - ANSWER: constant
Heat flows only from a body which is at a higher temperature to a body which is at a _________
temperature. - ANSWER: lower
Metallic parts of the evaporating and condensing units use _______ which have a high heat
conductivity (copper, brass, aluminum) - ANSWER: metals
Heat energy and other forms of energy are ____________________. - ANSWER: Interchangeable
Why is the compression cycle named the compression cycle? - ANSWER: Because it is the compressor
which changes the refrigerant vapor from low pressure to high pressure.
In any compression refrigeration system there are ______ different pressure conditions. - ANSWER:
Two
The liquid refrigerant entering the evaporator from the refrigerant flow control is suddenly under low
pressure. This refrigerant flow control is suddenly under low pressure. This makes it _________ (boil)
and absorb heat. - ANSWER: Vaporize
There is usually a ________________ to prevent liquid refrigerant from flowing into the suction line. -
ANSWER: Accumulator
Evaporators are mainly of two type a ____ system and the flooded system. - ANSWER: dry
Evaporators are made in ______ different styles. - ANSWER: Four (Shell type, Shelf type, Wall type, Fin
tube type)
Liquid refrigerant if it were to flow into the compressor, could cause considerable knocking and
__________ to the compressor. - ANSWER: Damage
The __________ ________ carries the refrigerant vapor from the evaporator to the compressor -
ANSWER: Suction Line
The _________________ __________________ used in the suction line should offer little resistance
to the flow of the vaporized refrigerant. - ANSWER: Low-side Filter-Drier
The compressor high-side service valve provides a _________ between the compressor and the
condenser. - ANSWER: shutoff
, Refrigeration compressors get their lubrication from a small amount of special lubricating oil placed
inside the compressor crankcase or _____________. - ANSWER: Housing
The _______ ____________ is a tank or cylinder with a series of baffles or screens which collect the
oil. - ANSWER: Oil Seperator
The condenser in the refrigeration cycle removes the ____________ heat from the refrigerant vapor. -
ANSWER: Condensation
A common finned type static condenser uses static means for natural ___________. - ANSWER:
Convection
A forced convection fin type condenser uses a fan to ________ air through the condenser. - ANSWER:
Force
The plate type condenser uses condenser tubes that are soldered or brazed to a _____ metal surface.
- ANSWER: Flat
Water cooled condensers usually consist of two ________, one within the other. - ANSWER: Tubes
The ___________ _________ is a storage tank for liquid refrigerant. - ANSWER: liquid receiver
___________ _______ __________ do not use liquid receivers because all the liquid refrigerant is
stored in the evaporator during the off part of the cycle. - ANSWER: Capillary Tube Systems
The ________ ____ _______________ is a tank-like accessory that keeps moisture, dirt, metal, and
chips from entering the refrigerant flow control. - ANSWER: Liquid Line Filter-Drier
___________ is harmful when mixed with oil in a system. It forms sludges and acids. - ANSWER:
Moisture
Domestic units often use _________ tubing. - ANSWER: Steel
In many installations the liquid line runs _______ to and in contact with the suction line. - ANSWER:
Parallel
The refrigerant flow control has two jobs.
1. It allows liquids refrigerant to enter the evaporator
2. It ____________ the required evaporating pressure in the evaporator - ANSWER: Maintains
The capillary tube is the ______ common refrigerant flow control for domestic refrigerators, freezers,
room air conditioners, and small commercial installations. - ANSWER: Most
The capillary tube is a long length of small diameter tubing that ________ pressure by reducing the
flow of refrigerant through its length. - ANSWER: Reduces
The Capillary tube refrigerant control does not use a check valve or a direction __________ valve. -
ANSWER: Control
How does the automatic expansion valve work? - ANSWER: As pressure drops on the low side, the
expansion valve opens and liquid refrigerant flows into the evaporator. It absorbs heat then, while
evaporating under low pressure.
Lowering the pressure in the evaporator lowers the temperature at which the refrigerant
______________. - ANSWER: Evaporates
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