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(a) Compute the electrical conductivity of a 5.3-mm diameter cylindrical semiconductor specimen 48 mm long in...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D = 10 mm, termal conductivity...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D = 10 mm, termal conductivity k = 240 w/m·K, density ρ = 2700 kg/m3, and specific heat cp-900 נ/kg-K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27°C and 20 m/s, respectively (a) Neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of...
Problem 04: A cylindrical metal specimen 15.0 mm in diameter and 150 mm long is to be subjected to a tensile stress of 50 MPa
Problem 04: A cylindrical metal specimen 15.0 mm in diameter and 150 mm long is to be subjected to a tensile stress of 50 MPa; at this stress level the resulting deformation will be totally elastic. (a) If the elongation must be less than 0.072 mm, which of the metals in following Table are suitable candidates? Why? (b) If, in addition, the maximum permissible diameter decrease is 2.3 x 10-3 mm when the tensile stress of 50 MPa is applied,...
5. A cylindrical specimen of aluminum having a diameter of 12.8 mm and a gauge length...
5. A cylindrical specimen of aluminum having a diameter of 12.8 mm and a gauge length of 50.800 mm is pulled in tension. Use the load-elongation characteristics tabulated below to complete parts (a) through (f). Use SI unit system. Load Length 0 7330 15,100 23,100 30,400 34,400 38,400 41,300 44,800 46,200 47,300 47,500 46,100 44,800 42,600 36,400 lb 0 1650 3,400 5,200 6,850 7,750 8,650 9,300 10,100 10,400 10,650 10,700 10,400 10,100 9,600 mim 50.800 50.851 50.902 50.952 51.003 51.054...
5. A long straight copper wire of diameter 2 mm carries an alternating current of 10...
5. A long straight copper wire of diameter 2 mm carries an alternating current of 10 A (rms) at 60 Hz. (a) Calculate the IR drop. To measure this voltage drop a sensitive ac voltmeter is connected across a length of the wire as shown. The voltmeter loop area is 50 cm x 50 cm. Calculate (b) the emf induced in the loop, (c) the ratio of the measured voltage and the IR drop. Repeat (b) and (c) at a...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D 10 mm, thermal conductivity k240...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D 10 mm, thermal conductivity k240 W/m- K, density p 2700 kg/m, and specific heat c900 J/kg K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27°C and 20 m/s, respectively (a) Neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of 1000 W/m....
summarizr the followung info and write them in your own words and break them into different...
summarizr the followung info and write them in your own words and break them into different key points. 6.5 Metering Chamber: 6.5.1 The minimum size of the metering box is governed by the metering area required to obtain a representative test area for the specimen (see 7.2) and for maintenance of reasonable test accuracy. For example, for specimens incorporating air spaces or stud spaces, the metering area shall span an integral number of spaces (see 5.5). The depth of...
summatize the following info and break them into differeng key points. write them in yojr own...
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D = 10 mm, termal conductivity k = 240 w/m·K, density ρ = 2700 kg/m3, and specific heat cp-900 נ/kg-K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27°C and 20 m/s, respectively (a) Neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of...
5. A cylindrical specimen of aluminum having a diameter of 12.8 mm and a gauge length of 50.800 mm is pulled in tension. Use the load-elongation characteristics tabulated below to complete parts (a) through (f). Use SI unit system. Load Length 0 7330 15,100 23,100 30,400 34,400 38,400 41,300 44,800 46,200 47,300 47,500 46,100 44,800 42,600 36,400 lb 0 1650 3,400 5,200 6,850 7,750 8,650 9,300 10,100 10,400 10,650 10,700 10,400 10,100 9,600 mim 50.800 50.851 50.902 50.952 51.003 51.054...
5. A long straight copper wire of diameter 2 mm carries an alternating current of 10 A (rms) at 60 Hz. (a) Calculate the IR drop. To measure this voltage drop a sensitive ac voltmeter is connected across a length of the wire as shown. The voltmeter loop area is 50 cm x 50 cm. Calculate (b) the emf induced in the loop, (c) the ratio of the measured voltage and the IR drop. Repeat (b) and (c) at a...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D 10 mm, thermal conductivity k240 W/m- K, density p 2700 kg/m, and specific heat c900 J/kg K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27°C and 20 m/s, respectively (a) Neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of 1000 W/m....
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
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