IPC ch.8
Which of the following can supply the energy for modern home heating systems?
*electricity *biomass *solar *geothermal
A thermostat____
*maintains the temp in a room *can turn heating system on *can turn it off too
Which of the following employs the the use of an external combustion engine?
*steam boat *coal-fired locomotive *nuclear power plant
Hydronic
A liquid-based substance used to carry heat energy through a heating system
A ____ heats water for water-based radiant heat.
Boiler,solar collector
Which of the following is an example of an internal combustion engine?
Cannon
Modern Fire Places use what to burn exhaust gases?
Catalytic combustor
The total amount of energy in the universe is ____.
Constant
In an external combustion engine, heat flow into a gas causes it to ____.
Expand
Exhaust stroke
Expels waste gases from the cylinder
Power stroke
Ignite the fuel and causes the product gases to push against the pistons
A catalytic combustor ______ the efficiency of a fire places.
Increases
A material with a _____ R-value is better insulator
Lower
The thermodynamics law that explains the movement of heat energy during the refrigeration cycle is the _____.
Second
Second law of thermodynamics
1) the tendency of the universe is to increase entropy and decrease the amount of usable energy. 2) heat will never flow spontaneously from a cold object to a hot object.
The element in the thermostat that is sensitive to the temperature changes is _____.
A bimetallic strip
Furnace
A heating appliance that uses heat energy released from fossil fuels to warm air for use in forced-air systems
Ozone layer
A layer of ozone (O3) in the stratosphere that absorbs much of the incoming ultraviolet radiation from the Sun and prevents it from reaching the surface of earth
Exhaust stroke
A process during which waste gases are expelled from an engine cylinder
Compression stroke
A process that pressurizes the fuel mixture in an engine
Compressor
A pump that increase the pressure of a gas
Refrigeration cycle
A sequence of thermodynamic processes whereby the use of a refrigerant accomplishes the transfer of heat energy so that cooling results
Conduction
A spoon resting in a cup of tea gets hot [ particles of the substance bump into each other and energy is transferred between particles
Refrigerant
A substance used to transfer heat energy while vaporizing and condensing
Expansion valve
A valve that controls the flow of fluid from a high pressure area to a low pressure area
Which of the following is not an example of an engine?
A waterfall
Bimetallic strip
A welded strip of two metals with different thermal expansion properties
Which of the following does not use an internal combustion engine?
A windmill
Air spaces are used in insulation because____.
Air is a poor conductor
The laws of thermodynamics state that, in heat engine,_____.
All the heat energy from a source cannot be converted to mechanical energy
Catalytic combust or
An attachment which allows exhaust gases to be chemically broken down to release more energy
Power stroke
An engine process during which fuel ignites and product gases push against the piston
A ______ is the part of the cooling system that pressurized vaporized refrigerant to make it hotter.
Compressor
____ systems distribute heat energy by the circulation of air
Convection
An engine is any machine that can ____.
Convert an energy input to mechanical energy output
Intake strike
Draws the fuel mixture into the cylinder
First law of thermodynamics
Energy can either be created nor destroyed; however, when heat is added to a system, energy can be changed from one form to another.
In the four-stroke internal combustion engine, hot vapors are expelled during the _____ stroke.
Exhaust
In a refrigerator or cooling system, a _____ controls the flow of fluid from high pressure are to low pressure area.
Expansion valve
A steam boat is an example of a machine that uses a ____ combustion engine.
External
If two substances with the same mass absorb the same amount of energy, the one with the higher specific heat capacity will increase its temperature more that the substance with the lower specific heat capacity. True or False?
False
The earliest method of food preservation was the icebox.
False
The key step in sweating that promotes cooling is the condensation of fluids.
False
Which refrigerant is known to destroy ozone?
Freon
A_____ is used to warm air for heating
Furnace
A piece of wood and a piece of steel are the same temperature; however, the steel feels hotter. This is because the steel has _____.
Greater thermal conductivity
Active solar heat
Heat energy obtained directly from the sun
Gases,fluids, and other solids in contact with moving object will produce____ due to friction.
Heat flow
Two rooms are in contact. One is at 15*C and the other is at 21*C. What is the best answer concerning heat flow?
Heat will flow from the 21*C room to the 15*C room.
A ____ fireplace continues to radiate heat even after the fire is extinguished.
Mansonry
One of the fundamental principles used in an internal combustion engine is that of hot gases occupy ______ space than the cool gases or liquids.
More
Zeroth law of thermodynamics
Objects in the thermal equilibrium have the same temperature, so no heat flows between them.
If the internal energy of a system increases but there is no change in temperate, the the system's ______ energy is increasing.
Potential
Fuel is combustion in the ______ stroke of a four-stroke engine.
Power
In the four-strike internal combustion engine, fuel is ignited the _____ stroke.
Power
Disputing the refrigeration cycle, warm goes are made even hotter due to _____.
Pressurization
Compression stroke
Pressurizes the fuel mixture
In the refrigeration cycle, the process of liquid changing to he vapor phase ______.
Pulls heat into energy into the liquid and cools the surroundings
The Sun's energy reaches the earth by____.
Radiation
The component of a refrigerator or air conditioner that absorbs and releases heat energy is the_____.
Refrigerant
The ____ law of thermodynamics states that the tendency of the universe is to entropy.
Second
The ____ law of thermodynamics states that when two objects of different temperature are in contact, heat energy will flow from the hotter to the cooler object.
Second
The speed of molecules is indirectly related to a measurement called _____.
Temperature
Newly designed home refrigerators use ____ as a refrigerant.
Tetrafluoroethane
External combustion
The combustion process as it occurs outside the engine
The refrigeration cycle uses _____
The laws of thermodynamics
What will happen as an object receives energy due to heat flow?
The molecules will move faster.
Combustion
The reaction of a substance with oxygen,releasing heat energy and/or light
Radiation
The sun warming earth [Electromagnetic waves]
Which of the following reduces energy loss due to conduction, convection, and radiation?
Thermos bottle
Modern masonry
These fire places were designed based on first developed ones during the late Little Ice Age
Radiant heat transfers energy___
To nearby solid objects
The use of ammonia as a refrigerant is a problem because it is _____.
Toxic
Air conditioners use the same principles as refrigeration in order to cool indoor environments.
True
Energy that is dissipated during heat flow cannot usually be used to produce work.
True
Most homes used biomass as a source of heat until the last 1800s.
True
Refrigeration slows the growth of bacteria in foods?? True or False?
True
Water has one of he highest specific heat capacities.
True
Which of the following became a major drawback to using ice blocks for food?
Unsanitary ice
The main reason ice blocks became unpopular for cooling food was _____.
Unsanitary sources of ice
The process of cooling air inside the refrigerator, the refrigerant _____.
Vaporizes
Convection
Water warming on a stove [The flow of heat due to the mass movement of a fluid]
The main explanation for why heat pumps work is the ____ law of thermodynamics
Zeroth
