Calculate the total sound pressure level of multiple sound sources: 55 dB, 68 dB, 25 dB, and 50 dB c) d) The noise level in a factory with 12 identical machines running is 80 dB. At night, the factory must comply with local noise regulation not to exceed 75 dB. How many machines can be used at the night shift

Calculate the total sound pressure level of multiple sound sources: 55 dB, 68 dB, 25 dB, and 50 dB c) d) The noise level in a factory with 12 identical machines running is 80 dB. At night, the factory must comply with local noise regulation not to exceed 75 dB. How many machines can be used at the night shift

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)

5th Edition

ISBN:9781305084766

Author:Saeed Moaveni

Publisher:Saeed Moaveni

Chapter12: Electric Current And Related Variables In Engineering

Section: Chapter Questions

Problem 31P

See similar textbooks

Similar questions

The discharge of water collected from a constant head permeameter in a period of 15 minutes is 500 ml. The internal diameter of the permeameter is 5 cm and the measured difference in head between two gauging points 15 cm vertically apart is 40 cm. Calculate the coefficient of permeability in mm/s. a.0.106 b.0.3788 c.1.23 x 10^(-2) d.0.750
1 Let the reverberation time be 1.5 s for an empty hall and 1.3 s when a curtain cloth of 20 m2 is suspended at the centre of the hall. If the dimensions of the hall are 10mx8mx6m, calculate the coefficient of absorption of the curtain cloth. What area of the empty hall wall should be covered by the similar curtain cloth so as to reduce the reverberation time to 1.1 s?
A venturi meter 45 cm by 20 cm has its axis inclined upward 30° from the horizontal. The distance measured along the axis, from the inlet to the throat is 1.20m. The differential manometer connected at the inlet throat shows deflection of 25cm of mercury. If the flow is upward and the blowing fluid has specific gravity of 2.0. Find the discharge and pressure head between the inlet and throat if the meter coefficient is 0.96.
Determine the throat diameter of a Venturi meter to be introduced in a horizontalsection of a 100 mm diameter main so that the deflection of a differential mercurymanometer connected between the inlet and the throat is 600 mm when the dischargeis 20 l/s of water. The discharge coefficient of the meter is 0.95.
Neglecting head loss, calculate the velocity of the water as it leaves thepipe. (Please round-off final answer to the nearest whole number) In Lake Geneva (Switzerland), there is a water jet (called the Jet d’Eau) that is discharged 130 m straight upward (measured from the surface of the lake). The exit of the discharge pipe is 20 cm in diameter.
Estimate the vapor pressure, air pressure, relative humidity, and air density at a height of 1500 m into the atmosphere. The total pressure is 100 kPa, air temperature is 28°C and the dew point temperature is 16°C near the ground, the lapse rate 6°C/km, which is constant for both air temperature and dew point temperature. The gas constant R is 287 J/kg-K and constant with respect to altitude. Air Pressure at 1500m, in kPa Round to two (2) decimal places
A Venturi meter 45 cm by 20 cm has its axis inclined upwards 300 from the horizontal. The distance measured along the axis, from the inlet to the throat is 1.20m. The differential manometer connected at the inlet and throat shows a deflection of 25 cm of mercury. If the flow is upward and the flowing fluid has specific gravity of 2.0, find the discharge and the pressure head difference between the inlet and throat if the meter coefficient is 0.96.
A Venturi meter 45 cm by 20 cm has its axis inclined upwards 30 degrees from the horizontal. The distance measured along the axis, from the inlet to the throat is 1.20m. The differential manometer connected at the inlet and throat shows a deflection of 25 cm of mercury. If the flow is upward and the flowing fluid has specific gravity of 2.0, find the discharge and the pressure head difference between the inlet and throat if the meter coefficient is 0.96
calculate the discharge through the venturimeter
Estimate the rate of flow of water through the venturi meter shown.
For a given HVAC water piping system, a pressure of 67 ft of head is required to produce 44 GPM water flow. How much pressure in ft will be required to flow 64 GPM?
Compare the performance of hoods A and B. Calculate the capture velocity at a distance of 3.5 feet. Which one has superior performance? Why? Given: Ventilation system airflow = 2,700 cfm Hood A: Round, unflanged, diameter = 9.5 inches Hood B: Round, flanged, diameter = 9.5 inches