Applied Thermodynamics 2

Explain the working principle of the Brayton cycle.

• The Brayton cycle is a type of internal combustion engine.

• The Brayton cycle is based on the Rankine cycle.

• The Brayton cycle is a thermodynamic cycle that describes the workings of a gas turbine engine.

• The Brayton cycle is used in refrigeration systems.

How is the psychrometric chart used to determine air properties?

• The psychrometric chart is used to determine air properties by tasting the air

• The psychrometric chart is used to determine air properties by visually analyzing the intersection of various lines on the chart corresponding to the known air conditions, allowing for the determination of the desired properties.

• The psychrometric chart is used to determine air properties by smelling the air

• The psychrometric chart is used to determine air properties by listening to the air

What are the key components of a gas power cycle?

• Compression, heat addition, expansion, heat rejection

• Cooling, fuel injection, ignition, exhaust

• Condensation, evaporation, mixing, separation

• Absorption, desorption, distillation, filtration

What factors affect the performance of a refrigeration system?

• Ambient temperature, condenser cleanliness, refrigerant charge level, evaporator coil condition, compressor efficiency

• Humidity level

• Color of the refrigerator

• Thermostat brand

Describe the process of superheating in a gas power cycle.

• Superheating is the process of cooling the gas below its saturation temperature

• Superheating in a gas power cycle is the process of heating the gas beyond its saturation temperature without changing its pressure.

• Superheating involves changing the pressure of the gas without changing its temperature

• Superheating in a gas power cycle is the process of compressing the gas to increase its temperature

How does the psychrometric chart help in HVAC system design?

• The psychrometric chart is used for decorative purposes in HVAC design

• The psychrometric chart is a tool for measuring temperature only in HVAC design

• The psychrometric chart is only applicable to industrial HVAC systems

• The psychrometric chart provides a graphical representation of air properties, aiding in calculations for HVAC system design.

Compare the Carnot cycle with the Rankine cycle in terms of efficiency.

• The Rankine cycle is more efficient than the Carnot cycle.

• Both cycles have the same efficiency.

• The Carnot cycle is more efficient than the Rankine cycle.

• Efficiency is not a factor in comparing these cycles.

What are the common refrigerants used in refrigeration systems?

• R-404A

• R-134a, R-410A, R-22

• R-123

• R-600a

Explain the concept of specific humidity in psychrometrics.

• Specific humidity is the measure of dryness in the air

• Specific humidity is only relevant in cold climates

• Specific humidity is the same as relative humidity

• Specific humidity is the ratio of the mass of water vapor to the total mass of moist air in a given volume.

Why is the regeneration process important in gas power cycles?

• To increase the cost of operation

• To improve efficiency by recovering waste heat and preheating air entering the combustion chamber.

• To reduce the overall power output

• To introduce more pollutants into the environment