Lesson 13 of 13 15 min
🧠 Quiz: Thermodynamics
Answer all questions to complete the quiz.
1
The zeroth law of thermodynamics establishes the basis for measuring which property?
2
A closed system receives 50 kJ of heat and does 20 kJ of work on its surroundings. By the first law, the change in internal energy is:
3
Wet steam at 200 kPa has a quality of 0.8. If h_f = 504.7 kJ/kg and h_fg = 2201.6 kJ/kg, its specific enthalpy is approximately:
4
For a closed system undergoing a constant-pressure (isobaric) process, the boundary work is given by:
5
In the steady-flow energy equation (SFEE) applied to an adiabatic, well-insulated nozzle, the increase in kinetic energy of the fluid comes primarily from:
6
A turbine has an isentropic efficiency of 85%. If the isentropic (ideal) enthalpy drop is 400 kJ/kg, the actual work output is:
7
A Carnot engine operates between 600 K and 300 K. Its maximum possible thermal efficiency is:
8
Which modification to the Rankine cycle raises efficiency AND keeps the turbine exit steam drier (higher quality)?
9
The air-standard Otto cycle efficiency depends only on which parameter?
10
A refrigerator removes 6 kW of heat from a cold space while consuming 2 kW of electrical power. Its COP and the heat rejected are:
11
Moist air at 30 °C and 50% relative humidity is cooled. At what temperature does liquid water first begin to condense?
12
Which heat transfer mode requires no medium and follows a fourth-power dependence on absolute temperature?
13
A plane wall (k = 0.04 W/m·K, thickness 0.08 m, area 1 m²) separates surfaces at 20 °C and −5 °C. The conductive heat flow is:
correct
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