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Three different turbines are installed in the room of a power station. The noise levels of...
5. The sound pressure levels (Lp) of seven different machines were 65, 72,79, 92, 83, 78...
5. The sound pressure levels (Lp) of seven different machines were 65, 72,79, 92, 83, 78 and 66 dB. Calculate the total sound pressure levels generated by these sources all operating simultaneously
A room is 6 m long, 5 m wide, and 4 m tall. The walls, ceiling,...
A room is 6 m long, 5 m wide, and 4 m tall. The walls, ceiling, and floor all initially have the same sound absorption coefficient (a 0.01). When all acoustic sources (machines) are active, the sound pressure level (SPL) measures 90 dB. However, to meet certain noise standards, the SPL has to be reduced to 80 dB by installing carpet on the floor. a) What should the carpet's sound absorption coefficient (ae) be? b) If the SPL must be...
The following data give noise levels measured at 25 different times directly outside of Grand Central...
The following data give noise levels measured at 25 different times directly outside of Grand Central Station in Manhattan. 82, 89, 94, 110, 74, 122, 112, 95, 100, 78, 65, 60, 90, 83, 87, 75, 114, 85, 69, 94, 124, 115, 107, 88, 97 Use this data to test the null hypothesis that the average noise level directly outside of Grand Central Station is less than or equal to 80 decibels. Hint: compute the p-value and make a reasonable decision...
7. Sound pressure level measurements were taken in a semi-anechoic chamber at 5 m from the...
7. Sound pressure level measurements were taken in a semi-anechoic chamber at 5 m from the source. A ten point hemispherical array was utilized in this process. The following data was obtained: (1) L,-94 dB, (2) Lp-96 dB, (3) L,-97 dB, (4) L,-93 dB, (5) Lp-92 dB, (6) L,-90 dB, (7) L,-91 dB, (8) L,-95 dB, (9) L,-93 dB, (10) Lp-94 dB From these values a) Determine the sound power level of the noise source b) The maximum directivity index...
Multi-processors computer operates in a server room in a building of weather station located in the...
Multi-processors computer operates in a server room in a building of weather station located in the mountains at altitude of 3000 m. The computer is cooled by three 1.5 W fans located at outlets from chassis. The number of processors is 4. The temperature and pressure in the server room are 25°C and 66.63 kPa, respectively. The temperature and air velocity at the outlets from the chassis are 50°C and 40.0 m/min, respectively, while diameters of fans are 0.1 m....
Problem 1 (Marks 3) Smithfield power station in NSW, Australia operates on 4 gas turbines. Each of the gas turbine unit...
Problem 1 (Marks 3) Smithfield power station in NSW, Australia operates on 4 gas turbines. Each of the gas turbine unit operates on the regenerative Brayton Cycle between the pressure limits of 100 kPa and 700 kPa. Air enters the compressor at 30°C at a rate of 12.6 kg/s and leaves at 260°C. It is then heated in a regenerator to 400°C by hot combustion gases leaving the turbine. Diesel fuel with heating value of 42,000 kJ/kg is burned in...
show all work please A professor predicts that students will lean better if they study to white noise (similar to a fan) compared to music or no sound. She randomly divides 27 students into three...
show all work please
A professor predicts that students will lean better if they study to white noise (similar to a fan) compared to music or no sound. She randomly divides 27 students into three groups and sends them to three different rooms. In the first room, students hear white noise, in the second, music from a local radio station, and in the third, the door is closed to help block out normal sound from the hall. Each group is...
An experiment was conducted to compare the growth of Douglas fir seedlings under three different levels...
An experiment was conducted to compare the growth of Douglas fir seedlings under three different levels of vegetation control (0%, 50% and 100%). 16 seedlings were randomized to each level of control. The resulting sample means for stem volume were 58, 73, and 105 cubic centimetres (cm3), respectively with sp = 17 cm3. The researcher hypothesized that the average growth at 50% control would be less than the average age of the 0% and 100% levels. a. What are the...
1) Three perfect gases at 20.000C were allowed to mix. Calculate the total pressure and the...
1) Three perfect gases at 20.000C were allowed to mix. Calculate the total pressure and the partial pressure of each gas if the pressures and volumes of the individual gases before mixing were: (8 pts) Gas 1: Volume 1.0 L, pressure 1.5 bar Gas 2: Volume 1.5 L, pressure 2.0 bar Gas 3: Volume 2.5 L, pressure 3.0 bar 2) Humidity levels affects the density of air. Calculate the density difference between a sample of dry air and a sample...
QUESTION 3 a) Researchers want to test the effect of three different diets on the weight...
QUESTION 3 a) Researchers want to test the effect of three different diets on the weight gain in 2 week- Diet 2 16 old lambs. The following table records the weight gain by the lambs. Diet 3 15 10 17 Diet 1 16 21 18 At the 0.05 level of significance, assess that there is a difference in the weight gain for each of the diet. (16 marks) b) Ten plots, each 10.4 meters, were randomly chosen in a large...
5. The sound pressure levels (Lp) of seven different machines were 65, 72,79, 92, 83, 78 and 66 dB. Calculate the total sound pressure levels generated by these sources all operating simultaneously
A room is 6 m long, 5 m wide, and 4 m tall. The walls, ceiling, and floor all initially have the same sound absorption coefficient (a 0.01). When all acoustic sources (machines) are active, the sound pressure level (SPL) measures 90 dB. However, to meet certain noise standards, the SPL has to be reduced to 80 dB by installing carpet on the floor. a) What should the carpet's sound absorption coefficient (ae) be? b) If the SPL must be...
7. Sound pressure level measurements were taken in a semi-anechoic chamber at 5 m from the source. A ten point hemispherical array was utilized in this process. The following data was obtained: (1) L,-94 dB, (2) Lp-96 dB, (3) L,-97 dB, (4) L,-93 dB, (5) Lp-92 dB, (6) L,-90 dB, (7) L,-91 dB, (8) L,-95 dB, (9) L,-93 dB, (10) Lp-94 dB From these values a) Determine the sound power level of the noise source b) The maximum directivity index...
Multi-processors computer operates in a server room in a building of weather station located in the mountains at altitude of 3000 m. The computer is cooled by three 1.5 W fans located at outlets from chassis. The number of processors is 4. The temperature and pressure in the server room are 25°C and 66.63 kPa, respectively. The temperature and air velocity at the outlets from the chassis are 50°C and 40.0 m/min, respectively, while diameters of fans are 0.1 m....
Problem 1 (Marks 3) Smithfield power station in NSW, Australia operates on 4 gas turbines. Each of the gas turbine unit operates on the regenerative Brayton Cycle between the pressure limits of 100 kPa and 700 kPa. Air enters the compressor at 30°C at a rate of 12.6 kg/s and leaves at 260°C. It is then heated in a regenerator to 400°C by hot combustion gases leaving the turbine. Diesel fuel with heating value of 42,000 kJ/kg is burned in...
show all work please
A professor predicts that students will lean better if they study to white noise (similar to a fan) compared to music or no sound. She randomly divides 27 students into three groups and sends them to three different rooms. In the first room, students hear white noise, in the second, music from a local radio station, and in the third, the door is closed to help block out normal sound from the hall. Each group is...
QUESTION 3 a) Researchers want to test the effect of three different diets on the weight gain in 2 week- Diet 2 16 old lambs. The following table records the weight gain by the lambs. Diet 3 15 10 17 Diet 1 16 21 18 At the 0.05 level of significance, assess that there is a difference in the weight gain for each of the diet. (16 marks) b) Ten plots, each 10.4 meters, were randomly chosen in a large...
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