Engineering

Question 1

Problem (1) a) What is the function of the capacitor placed at the output terminals of a rectifying circuit? b) Sketch the output voltage of a single-phase full wave bridge rectifier with and without the smoothing capacitor showing the effect on the ripple voltage. c) A direct voltage of 50 volts and a direct current of 40 A are to be drawn from a single-phase half wave rectifier. The rectifier is connected to 220 v a.c supply via a transformer. Calculate the values of the secondary a.c voltage, the secondary a.c current, the peak reverse voltage, the transformer apparent power, the transformer utilization factor, and the transformer turns ratio. d) Using the values obtained in (c) for the transformer, if a coil of 10 mH in connected in series with the resistor, draw the waveforms of the output voltage and current then calculate their values. e) If a freewheeling diode is connected in parallel with the load, draw the waveforms of the output voltage and current then calculate their values.

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Question 2

A simply supported timber beam carries a uniformly distributed load of w = 16kN / m IL = 3m b = 110mm h = 240 mm, Y_{H} = 45mm Y_{K} = 70mm x =0.25^ * L]

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$A simply supported timber beam carries a uniformly distributed load of w = 16kN / m IL = 3m b = 110mm h = 240 mm, Y_{H} = 45mm Y_{K} = 70mm x =0.25^ * L]$

A simply supported timber beam carries a uniformly distributed load of w = 16kN / m IL = 3m b = 110mm h = 240 mm, Y_{H} = 45mm Y_{K} = 70mm x =0.25^ * L]

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Question 3

Problem (2) a) What are the basis applied for selecting rectifier diodes.? b) A direct voltage of 30 volts and a direct current of 200 A are needed for a heater. A three-phase supply with 380 v is available. i. Sketch the input a.c voltage, output d.c voltage and current, diode currents, supply currents, and the diode voltage for; – A three-phase full wave rectifier. – A three-phase half-wave rectifier. ii. Calculate the values of the transformer secondary a.c voltage and a.c current, the peak reverse voltage, the transformer apparent power, the transformer utilization factor, and the transformer turns ratio for both configurations.

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Problem (2) a) What are the basis applied for selecting rectifier diodes.? b) A direct voltage of 30 volts and a direct current of 200 A are needed for a heater. A three-phase supply with 380 v is available. i. Sketch the input a.c voltage, output d.c voltage and current, diode currents, supply currents, and the diode voltage for; – A three-phase full wave rectifier. – A three-phase half-wave rectifier. ii. Calculate the values of the transformer secondary a.c voltage and a.c current, the peak reverse voltage, the transformer apparent power, the transformer utilization factor, and the transformer turns ratio for both configurations.

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Question 4

Show that the time required for a material to attain at least 99.9% of its maximum possible moisture content is given by t ¼ 0:679c2 Dz , where t is time in seconds c is the laminate thickness

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Show that the time required for a material to attain at least 99.9% of its maximum possible moisture content is given by t ¼ 0:679c2 Dz , where t is time in seconds c is the laminate thickness

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Question 5

The mean fatigue lives of [0=90]S E-glass fiber–epoxy laminates at maximum stress levels of 56,000 and 35,000 psi are 1,500 and 172,000, respectively. The static tensile strength of this material is 65,000 psi. Determine the residual static strength of this material after 50% of the fatigue life at each stress level 2. After cycling for 50% of the fatigue life at 35,000 psi, the maximum stress level in a fatigue specimen is increased to 56,000 psi. Estimate the number of cycles the specimen would survive at 56,000 psi 3. If the first stress level is 56,000 psi, which is then followed by 35,000 psi, estimate the number of cycles at the second stress level

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The mean fatigue lives of [0=90]S E-glass fiber–epoxy laminates at maximum stress levels of 56,000 and 35,000 psi are 1,500 and 172,000, respectively. The static tensile strength of this material is 65,000 psi. Determine the residual static strength of this ...

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Question 6

The flexural strength of a unidirectional 08 E-glass–vinyl ester beam is 95 ksi, and the estimated ILSS for the material is 6 ksi. Determine the maximum span–thickness ratio for a short-beam shear specimen in which interlaminar shear failure is expected.

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The flexural strength of a unidirectional 08 E-glass–vinyl ester beam is 95 ksi, and the estimated ILSS for the material is 6 ksi. Determine the maximum span–thickness ratio for a short-beam shear specimen in which interlaminar shear failure is expected.

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Question 7

Calculate the average density of an interply hybrid beam containing m layers of T-300 carbon fiber–epoxy and n layers of E-glass fiber–epoxy. The thickness of each carbon fiber layer is tc and that of each glass layer is tg. The fiber volume

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Calculate the average density of an interply hybrid beam containing m layers of T-300 carbon fiber–epoxy and n layers of E-glass fiber–epoxy. The thickness of each carbon fiber layer is tc and that of each glass layer is tg. The ...

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Question 8

A carbon fiber bundle containing 2000 parallel filaments is being tested in tension. The filament length is 100 mm. The strength distribution of individual filaments is described in Problem P2.5. Compare the mean filament strength and the mean fiber bundle strength. Schematically show the tensile stress–strain diagram of the carbon fiber bundle and compare it with that of the carbon filament. (Note: For a ¼ 6.58, G 1 þ 1 a ffi 0:93.)

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A carbon fiber bundle containing 2000 parallel filaments is being tested in tension. The filament length is 100 mm. The strength distribution of individual filaments is described in Problem P2.5. Compare the mean filament strength and the mean fiber bundle

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Question 9

La varilla AB se suelda a la placa de 12 in. de radio que gira a razón constante 1 6 rad/s. Si se sabe que el collarín D se mueve hacia el extremo B de la varilla a una rapidez constante u 78 in./s, determine, para la posición mostrada a) la velocidad de D, b) la aceleración de D

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La varilla AB se suelda a la placa de 12 in. de radio que gira a razón constante 1 6 rad/s. Si se sabe que el collarín D se mueve hacia el extremo B de la varilla a una ...

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Question 10

Programming Project 9.22.8: •••. Add a feature to the CashRegister class for computing sales tax. The tax rate should be supplied when constructing a CashRegister object. Add add_taxable_item and get_total_tax member functions. (Items added with add_item are not taxable.)

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Programming Project 9.22.8: •••. Add a feature to the CashRegister class for computing sales tax. The tax rate should be supplied when constructing a CashRegister object. Add add_taxable_item and get_total_tax member functions. (Items added with add_item are not taxable.)

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