Engineering Board Exam Reviewer · Engineering Materials · medium
According to the Gibbs phase rule (F = C - P + 2), at the triple point of a pure substance (C = 1, P = 3), the number of degrees of freedom is:
- 0
- 1
- 2
- 3
Answer
A. 0
Solution
F = 1 - 3 + 2 = 0: the triple point is invariant.
More Engineering Materials questions
- In a two-phase + L region, an alloy of 30% B lies on a tie line with at 10% B and liquid at 40% B. What is the mass fraction of ?
- What is the mass fraction of cementite in pearlite (eutectoid steel, 0.76% C) just below 727 °C? (ferrite 0.022% C, cementite 6.70% C)
- A 0.40% C steel is slowly cooled to just below 727 °C. What is the mass fraction of pearlite? (Use 0.022% C for ferrite and 0.76% C for…
- A steel has a plane-strain fracture toughness of 50 MPa · sqrt(m). For a design stress of 300 MPa and Y = 1.0, what is the critical crack…
- A steel plate with an edge crack 2 mm deep is loaded in tension at 200 MPa. Using K = 1.12 sqrt(π a), what is the stress intensity factor?
- A structural steel with a yield strength of 250 MPa is designed with a factor of safety of 2.5. What is the allowable stress?
- For steels, tensile strength ( MPa) 3.45 × BHN. What is the approximate tensile strength of a steel with a Brinell hardness of 229?
- A Brinell test uses a 10 mm ball under a load of 3000 kgf and produces an indentation 4.0 mm in diameter. What is the Brinell hardness…
- What is the maximum load a 10 mm diameter rod with an ultimate tensile strength of 500 MPa can carry?
- What is the true strain corresponding to an engineering strain of 0.20?