(a)
Interpretation:
From the following graph of heat treatment, The yield strength and tensile strength needs to be determined. The steel is used of 1050 steel with brinel hardness at least 330 and elongation at least 15%.
Concept Introduction:
Heat treatment takes place under metal operating procedures that sometimes also alter chemical physical characteristics. In the production of many other products, such as glass, heat treatments are also used. Heat treatment includes heating o rcooling to obtain a required outcome such as hardening or softening of a material, usually at extreme temperatures. Techniques for heat treatment include annealing.
(b)
Interpretation:
The tensile strength and yield strength obtained using 1080 steel under heat treatment process needs to be determined.
Concept Introduction:
Heat treatment includes heating or cooling to obtain a required outcome such as hardening or softening of a material, usually at extreme temperatures. Techniques for heat treatment include annealing Heat treatment takes place under metal operating procedures that sometimes also alter chemical physical characteristics. In the production of many other products, such as glass, heat treatments are also used.
(c)
Interpretation:
During the normalisation of 1050 steel, find the yield strength, tensile strength and % elongation needs to be determined.
Concept Introduction:
Heat treatment takes place under metal operating procedures that sometimes also alter chemical physical characteristics. In the production of many other products, such as glass, heat treatments are also used. Heat treatment includes heating or chilling to obtain a required outcome such as hardening or softening of a material, usually at extreme temperatures. Techniques for heat treatment include annealing.
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Chapter 13 Solutions
Essentials Of Materials Science And Engineering, Si Edition
- Assume the B frame differs from the N frame through a 90 degree rotation about the second N base vector. The corresponding DCM description is: 1 2 3 4 5 6 9 # adjust the return matrix values as needed def result(): dcm = [0, 0, 0, 0, 0, 0, 0, 0, 0] return dcmarrow_forward"I need something clear written by hand with steps." Find Laplace transform and the corresponding ROC for x(t) = e−3sin(2t) u(t)dtarrow_forwardThree similar coils, connected in star, take a total power of 1.5 kW, at a power factor of 0.2, from a three-phase, 400 V, 50 Hz supply. Calculate: (a) the resistance and inductance of each coil; (b) the line currents if one of the coils is short-circuited.arrow_forward
- (a) Three 20 µF capacitors are star-connected across a 400 V, 50 Hz, three-phase, three-wire supply. Calculate the current in each line. (b) If one of the capacitors is short-circuited, calculate the line cur rents. (c) If one of the capacitors is open-circuited, calculate: the line currents and the p.d. across each of the other two capacitors. ANS: 1.525 A; 2.64 A, 2.64 A, 4.57 A; 1.32 A, 1.32 A, 0; 210 Varrow_forwardExplain the advantages of three-phase supply for distribution purposes. (b) Assuming the relationship between the line and phase values of currents and voltages, show that the active power input to a three-phase balanced load is √3VI cos φ, where V and I are line quantities. (c) Three similar inductors, each of resistance 10 Ω and inductance 0.019 H, are delta-connected to a three-phase, 400 V, 50 Hz sinusoidal supply. Calcu late: the value of the line current; the power factor and the active power input to the circuit. ANS: 59.5 A, 0.858 lag, 35.5 kWarrow_forwardnot use ai pleasearrow_forward
- A three-phase, 400 V, star-connected motor has an output of 50 kW, with an efficiency of 90 per cent and a power factor of 0.85. Calculate the line current. Sketch a phasor diagram showing the voltages and currents. If the motor windings were connected in mesh, what would be the correct voltage of a three phase supply suitable for the motor? ANS: 90.8 A, 240 Varrow_forwardDon't use ai to answer I will report you answerarrow_forwardShow with the aid of a phasor diagram that for both star- and delta-connected balanced loads, the total active power is given by √3VI cos φ, where V and I are the line values of voltage and current respectively and φ is the angle between phase values of voltage and current. A balanced three-phase load consists of three coils, each of resistance 4 Ω and inductance 0.02 H. Determine the total active power when the coils are (a) star-connected, (b) delta-connected to a 400 V, three phase, 50 Hz supply. ANS:11.56 kW, 34.7 kWarrow_forward
- The load connected to a three-phase supply comprises three similar coils connected in star. The line currents are 25 A and the apparent and active power inputs are 20 kVA and 11 kW respectively. Find the line and phase voltages, reactive power input and the resistance and reactance of each coil. If the coils are now con nected in delta to the same three-phase supply, calculate the line currents and the active power taken. ANS : 462 V, 267 V, 16.7 kvar, 5.87 Ω, 8.92 Ω; 75 A, 33 kWarrow_forwardA three-phase delta-connected load, each phase of which has an inductive reactance of 40 Ω and a resistance of 25 Ω, is fed from the secondary of a three-phase star-connected transformer which has a phase voltage of 230 V. Draw the circuit diagram of the system and calculate: (a) the current in each phase of the load; (b) the p.d. across each phase of the load; (c) the current in the transformer secondary windings; the total active power taken from the supply and its power factor.arrow_forwardDerive the numerical relationship between the line and phase currents for a balanced three-phase delta connected load. Three coils are connected in delta to a three-phase, three-wire, 400 V, 50 Hz supply and take a line current of 5 A 0.8 power factor lagging. Calculate the resistance and inductance of the coils. If the coils are star-connected to the same supply, calculate the line current and the total power. Calculate the line cur rents if one coil becomes open-circuited when the coils are connected in star. Ans: 110.7 Ω, 0.264 H; 1.67 A, 926 W; 1.445 A, 1.445 A, 0arrow_forward
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