What is acoustics and how are acoustical materials used?
What will be an ideal response?
Acoustics is the science of sound, including the generation, transmission, and effects of sound waves. Acoustical materials are used to reduce the levels of sound within an area, such as a room, by absorption and to control sound transmission between adjacent areas caused by sound vibrations in a building structure.
You might also like to view...
A 600 V, dc shunt motor has armature and field resistances of l.5 ? and 600 ?, respectively. When the motor runs unloaded, the line current is 3 A, and the speed is 1000 rpm.
a. Calculate motor speed when the load draws an armature current of 30 A. b. If the load is constant-torque type, what is the motor speed when 3 ? resistance is added to the armature circuit? c. Calculate the motor speed if the field is reduced by 10%.
A "floating" TTL input is an:
A) unused input that is tied to ground. B) unused input that is tied to Vcc through a 1-k? resistor. C) unused input that is tied to used inputs. D) unused input that is not connected.
On vehicles that have an EGR temperature sensor, what is the sensor used for?
A) Functional test of the EGR system B) Verifying exhaust valve timing C) Helps increase EGR temperature D) Testing for exhaust restrictions
A combinational logic configuration for an XOR gate consists of
A) two NAND gates connected to the inputs of an OR gate. B) two inverters connected to two AND gates connected to an OR gate. C) an inverter connected to an OR gate. D) none of the above.