Homework Answers
The ac transmission line suffer from the skin effect as the effect diameter of the conductor is reduced the effective ac resistance is increased so , ohmic losses are greater in case of ac transmission line , while dc faces less ohmic losses because of absence of skin effect
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(10 pts) For a power line made of Aluminum with a diameter of 60 mm, we...
(10 pts) For a power line made of Aluminum with a diameter of 60 mm, we...
(10 pts) For a power line made of Aluminum with a diameter of 60 mm, we can transmit either DC or AC power (50 Hz). Which case exhibits lower ohmic losses? Explain.
A 20-mm-diameter steel shaft, made of AISI 1035 HR steel, transmits power while rotating at 400...
A 20-mm-diameter steel shaft, made of AISI 1035 HR steel, transmits power while rotating at 400 rev/min. Assume any bending moments in the shaft to be relatively small compared to the torque. Determine how much power, in units of kW, the shaft can transmit with a static factor of safety of 1.5 based on (a) the maximum-shear-stress theory. (b) distortion-energy theory.
Review Part A The 60-mm-diameter shaft is made of 6061-T6 aluminum. (Figure 1) If the allowable...
Review Part A The 60-mm-diameter shaft is made of 6061-T6 aluminum. (Figure 1) If the allowable shear stress is Tallow = 80 MPa, and the angle of twist of disk A relative to disk C is limited so that it does not exceed 0.035 rad, determine the maximum allowable torque T Figure Express your answer to three significant figures and include the appropriate nits. 1 of 1 1.20 m A ? B 1.20 m Value T Units Request Answer Submit...
The 60-mm-diameter shaft is made of 6061-T6 aluminum having an allowable shear stress of Tllow -78...
The 60-mm-diameter shaft is made of 6061-T6 aluminum having an allowable shear stress of Tllow -78 MPa (Figure 1) Part A Determine the maximum allowable torque T Express your answer to three significant figures and include the appropriate units. aue Units Submit Ans incorrect: Try Again: 5 attempts remaining Part B Find the corresponding angle of twist of disk A relative to disk C Express your answer using three significant figures. igure < 1of1 > uest Ans 1.20 m 1.20...
d) A transmission line designed for power transmission at 60 Hz is made with superconducting cables. The two conductors...
d) A transmission line designed for power transmission at 60 Hz is made with superconducting cables. The two conductors that make the transmission line are separated by 3 m. The size of the wires is not known, but their inductance per unit length is 0.5 μΗ/m. The permittivity and permeability are those of free space and the conductivity of air is 10-7 S/m. Calculate: The attenuation constant of the line. ii) The characteristic impendence of the line.
d) A transmission...
The 50-mm-diameter shafts AB & DE are made of A-36 steel (G = 75 GPa) and...
The 50-mm-diameter shafts AB & DE are made of A-36 steel (G = 75 GPa) and are supported on journal bearings that allow the shafts to rotate freely and the turbine at Eis fixed from turning. If the allowable angle of twist of C with respect to Eis 0.2" and shaft AB rotates at 30 Hz, determine the maximum power (hp) that can be delivered from the motor, 0.75 m Tunin
#16 A 22.0-cm-diameter coil consists of 28 turns of circular copper wire 2.6 mm in diameter....
#16
A 22.0-cm-diameter coil consists of 28 turns of circular copper wire 2.6 mm in diameter. A uniform magnetic field, perpendicular to the plane of the coil, changes at a rate of 8.65 Times 10^-3 T/s. Determine the current in the loop, and the rate at which thermal energy is produced. A power line carrying a sinusoidally varying current with frequency f = 60 Hz and peak value I_0 = 55 kA runs at a height of 7.0 m across...
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...
A hollow shaft consisting of a steel tube of 50-mm outer diameter is to transmit 250 kW of power while rotating at a frequency of 30 Hz. Determine - (7 points) (a) the tube thickness that should be u...
A hollow shaft consisting of a steel tube of 50-mm outer diameter is to transmit 250 kW of power while rotating at a frequency of 30 Hz. Determine - (7 points) (a) the tube thickness that should be used if the shearing stress is not to exceed 100 MPa. (3 points) (b) since in this simplified design calculation, the only stress considered is shear stress exerted on the shaft due to torques. Without taking into account of how power is...
A 10 hp, 60 Hz, three-phase induction motor is delivering rated power while running at 864...
A 10 hp, 60 Hz, three-phase induction motor is delivering rated power while running at 864 rpm. The motor is drawing power from a 208 V, three-phase source. DC tests determine: R1 0.2 ? and R2-0.15 ?, we do not know XI and X2. Ignore XM. The rotational and core losses are 200 W and 100 W respectively. Find: a) The output (shaft torque). b) The number of poles. c) The input power and efficiency d) The power factor at...
(10 pts) For a power line made of Aluminum with a diameter of 60 mm, we can transmit either DC or AC power (50 Hz). Which case exhibits lower ohmic losses? Explain.
Review Part A The 60-mm-diameter shaft is made of 6061-T6 aluminum. (Figure 1) If the allowable shear stress is Tallow = 80 MPa, and the angle of twist of disk A relative to disk C is limited so that it does not exceed 0.035 rad, determine the maximum allowable torque T Figure Express your answer to three significant figures and include the appropriate nits. 1 of 1 1.20 m A ? B 1.20 m Value T Units Request Answer Submit...
The 60-mm-diameter shaft is made of 6061-T6 aluminum having an allowable shear stress of Tllow -78 MPa (Figure 1) Part A Determine the maximum allowable torque T Express your answer to three significant figures and include the appropriate units. aue Units Submit Ans incorrect: Try Again: 5 attempts remaining Part B Find the corresponding angle of twist of disk A relative to disk C Express your answer using three significant figures. igure < 1of1 > uest Ans 1.20 m 1.20...
d) A transmission line designed for power transmission at 60 Hz is made with superconducting cables. The two conductors that make the transmission line are separated by 3 m. The size of the wires is not known, but their inductance per unit length is 0.5 μΗ/m. The permittivity and permeability are those of free space and the conductivity of air is 10-7 S/m. Calculate: The attenuation constant of the line. ii) The characteristic impendence of the line.
d) A transmission...
The 50-mm-diameter shafts AB & DE are made of A-36 steel (G = 75 GPa) and are supported on journal bearings that allow the shafts to rotate freely and the turbine at Eis fixed from turning. If the allowable angle of twist of C with respect to Eis 0.2" and shaft AB rotates at 30 Hz, determine the maximum power (hp) that can be delivered from the motor, 0.75 m Tunin
#16
A 22.0-cm-diameter coil consists of 28 turns of circular copper wire 2.6 mm in diameter. A uniform magnetic field, perpendicular to the plane of the coil, changes at a rate of 8.65 Times 10^-3 T/s. Determine the current in the loop, and the rate at which thermal energy is produced. A power line carrying a sinusoidally varying current with frequency f = 60 Hz and peak value I_0 = 55 kA runs at a height of 7.0 m across...
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...
A hollow shaft consisting of a steel tube of 50-mm outer diameter is to transmit 250 kW of power while rotating at a frequency of 30 Hz. Determine - (7 points) (a) the tube thickness that should be used if the shearing stress is not to exceed 100 MPa. (3 points) (b) since in this simplified design calculation, the only stress considered is shear stress exerted on the shaft due to torques. Without taking into account of how power is...
A 10 hp, 60 Hz, three-phase induction motor is delivering rated power while running at 864 rpm. The motor is drawing power from a 208 V, three-phase source. DC tests determine: R1 0.2 ? and R2-0.15 ?, we do not know XI and X2. Ignore XM. The rotational and core losses are 200 W and 100 W respectively. Find: a) The output (shaft torque). b) The number of poles. c) The input power and efficiency d) The power factor at...
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