Heat Transfer Concepts & Quiz - Mechanical Engineering

 Page 1


Reading Quiz 
• A container of helium gas is heated, 
raising the temperature of the gas. This 
causes 
• the average kinetic energy of the gas molecules 
to increase. 
• the average potential energy of the gas 
molecules to increase. 
• the average acceleration of the gas molecules to 
increase 
Page 2


Reading Quiz 
• A container of helium gas is heated, 
raising the temperature of the gas. This 
causes 
• the average kinetic energy of the gas molecules 
to increase. 
• the average potential energy of the gas 
molecules to increase. 
• the average acceleration of the gas molecules to 
increase 
The internal energy U of a system is increased by  
the transfer of either heat or work into the system. 
 
?U = Q -W
Frist Law of Thermodynamics
Internal Energy = Added Heat - Work done by the system
Page 3


Reading Quiz 
• A container of helium gas is heated, 
raising the temperature of the gas. This 
causes 
• the average kinetic energy of the gas molecules 
to increase. 
• the average potential energy of the gas 
molecules to increase. 
• the average acceleration of the gas molecules to 
increase 
The internal energy U of a system is increased by  
the transfer of either heat or work into the system. 
 
?U = Q -W
Frist Law of Thermodynamics
Internal Energy = Added Heat - Work done by the system
A falling mass turns a paddle in an insulated beaker of  
water in this schematic representation of Joule’s  
apparatus for measuring the temperature increase  
produced by doing mechanical work on a system. 
Page 4


Reading Quiz 
• A container of helium gas is heated, 
raising the temperature of the gas. This 
causes 
• the average kinetic energy of the gas molecules 
to increase. 
• the average potential energy of the gas 
molecules to increase. 
• the average acceleration of the gas molecules to 
increase 
The internal energy U of a system is increased by  
the transfer of either heat or work into the system. 
 
?U = Q -W
Frist Law of Thermodynamics
Internal Energy = Added Heat - Work done by the system
A falling mass turns a paddle in an insulated beaker of  
water in this schematic representation of Joule’s  
apparatus for measuring the temperature increase  
produced by doing mechanical work on a system. 
Steam issuing from the kettle makes the pinwheel  
turn in this simple steam turbine. Work could be  
done to lift a small weight with such an engine. 
Page 5


Reading Quiz 
• A container of helium gas is heated, 
raising the temperature of the gas. This 
causes 
• the average kinetic energy of the gas molecules 
to increase. 
• the average potential energy of the gas 
molecules to increase. 
• the average acceleration of the gas molecules to 
increase 
The internal energy U of a system is increased by  
the transfer of either heat or work into the system. 
 
?U = Q -W
Frist Law of Thermodynamics
Internal Energy = Added Heat - Work done by the system
A falling mass turns a paddle in an insulated beaker of  
water in this schematic representation of Joule’s  
apparatus for measuring the temperature increase  
produced by doing mechanical work on a system. 
Steam issuing from the kettle makes the pinwheel  
turn in this simple steam turbine. Work could be  
done to lift a small weight with such an engine. 
Heat released by 
burning gasoline in the 
cylinder of an 
automobile engine 
causes the piston to  
move, converting some 
of the heat to work.