WorksheetsIntroduction to Thermal and Fluids Engineering
Total questions: 10
Worksheet time: 5mins
In the diagram showing everyday applications, which device primarily uses forced convection to reject heat from circulating coolant?
Aircraft engine compressor stage
Automobile radiator with water out
Human body skin surface cooling
Domestic refrigerator evaporator coil
Window air conditioner indoor coil
In the schematic, what is the role of the cooling tower connected to warm water from the condenser?
Increase steam pressure before the boiler
Reject heat to atmosphere and cool water
Add heat to improve turbine efficiency
Filter ash before combustion chamber
Store electrical energy between cycles
Which stage in the coal plant diagram is directly responsible for electrical power generation?
Generator converting rotation to electricity
Condenser turning steam into liquid
Turbine converting steam to rotation
Boiler combusting coal into hot gases
Transformer raising voltage for transmission
Which statement best distinguishes a closed system from an open system in thermodynamics, as illustrated in the diagrams?
Open systems restrict both energy and mass at boundaries
Closed systems allow both energy and mass to cross boundaries
Closed systems allow energy but not mass to cross boundaries
Open systems allow mass but not energy to cross boundaries
Which statement best defines a steady process in thermodynamics?
System properties vary with time at boundaries
System properties remain constant with time at boundaries
Mass flow is zero at all locations in the system
Temperature is uniform everywhere inside the system
In the computer cooling example, which characteristic indicates a steady process?
Electrical work does not cross the boundary
Mass flow stops at the inlet during operation
Air temperature changes with time at the exit
Air temperature changes with location but not time
A system where both mass and energy cross the boundary can be steady if which condition holds?
Properties do not vary with time at boundaries
Mass flow rate is intermittent over time
Temperature is higher at exit than entrance
Energy transfer ceases after start-up
In the computer cooling diagram, the temperature at the entrance and exit are shown as horizontal lines over time. What does this imply?
Temperatures decrease exponentially with time at both locations
Temperatures increase linearly with time at both locations
Temperatures are constant with time at both locations
Temperatures fluctuate randomly with time at both locations
Which scenario would violate steadiness in the computer cooling system?
Boundary allowing continuous heat and electrical work
Constant cold air supply at the inlet
Card decks heating raising exit temperature over time
Fan speed fixed causing constant exit temperature
Identify the best classification for a capped water bottle at room temperature. Assume the cap is intact and the bottle is not leaking.
Open system, vapor exchange balances pressure
Closed system, fixed mass inside boundary
Open system, water flows through boundary
Isolated system, heat and work exchange occur
