What characterizes the sublimation region on a phase diagram__________________?
Show answer Hide answer
Answer: A. solid and vapour phases are in equi-librium
Explanation
The sublimation region on a thermodynamic phase diagram defines the equilibrium boundary where solid and vapor phases coexist. Along this specific boundary line, molecules transition directly between solid and gas states without entering a liquid phase. Thermodynamic equilibrium requires chemical potentials of the solid and vapor phases to balance perfectly along the sublimation curve. Phase diagrams graphically represent the states of matter under varying temperature and pressure thermodynamic conditions. Sublimation occurs at pressures and temperatures situated below the triple point where liquid phase cannot stably exist. Triple points represent the unique condition where solid, liquid, and vapor phases exist in simultaneous thermodynamic equilibrium.
Option B describes the melting or fusion curve where solid and liquid phases remain in equilibrium. Option C represents the vaporization or condensation curve where liquid and vapor phases coexist. Option D refers specifically to the isolated triple point rather than the extended sublimation region.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What is the approximate capillary height of water at 20°C inside a clean glass tube with a 1 mm bore____________________?
Show answer Hide answer
Answer: E. 30 mm
Capillary action causes water to rise inside small-diameter glass tubes due to the adhesive forces between water and glass. Surface tension forces pull the liquid column upward until the weight of the water column balanc...
Q2. What is the typical metallic composition of silver solder ___________________?
Show answer Hide answer
Answer: A. silver, copper, zinc
Silver solder is a brazing alloy primarily composed of silver, copper, and zinc to lower melting points and improve joint strength. Adding copper and zinc to silver creates a ternary alloy system with a significantly low...
Q3. What term is used for the center of gravity of the volume of liquid displaced by a floating body ___________________?
Show answer Hide answer
Answer: D. centre of buoyancy
The center of buoyancy corresponds geometrically to the centroid of the displaced fluid volume. Upward buoyant forces act directly through this specific point on any floating object. Its relative position compared to the...
Q4. What is the typical compression ratio range for standard passenger car engines___________________?
Show answer Hide answer
Answer: B. 7
The compression ratio of an internal combustion engine compares cylinder volume at bottom dead center to top dead center. Standard passenger car gasoline engines are designed with compression ratios ranging typically bet...
Q5. What is the maximum allowable ash content percentage in diesel oil_______________?
Show answer Hide answer
Answer: E. 0.001%
Diesel fuel specifications restrict ash content to extremely low levels, typically a maximum of 0.001%, to prevent fuel system wear. Excessive ash-forming mineral compounds in diesel oil can cause abrasive wear on precis...
Q6. What type of draft system is characterized by a balanced draft furnace_________________________?
Show answer Hide answer
Answer: B. induced draft fan and forced draft fan
A balanced draft system combines both a forced draft fan and an induced draft fan. The forced draft fan pushes combustion air efficiently through the furnace grates. Meanwhile, the induced draft fan pulls spent exhaust g...