Decibels Study guides, Class notes & Summaries

FMF Written Test Question and answers rated A+ 2023/2024At what noise level should double protection be worn? - correct answer 104 decibels When did Ophae Mae Johnson become the first female enlisted marines? - correct answer 13 August 1918 When a Hemorrhagic shock occurs what does your pulse reach? - correct answer 140 or higher How many principles are in ORM? - correct answer 4 1. Accept risk

Attenuation - correct answer The Decrease in magnitude or power loss of a signal. Decibels, dB - correct answer Unit of measurement for attenuation. American Wire Gauge (AWG) - correct answer The numerical system for designating wire diameter. inverse relationship - correct answer American Wire Gauge numbers have this relationship to the wire size. Balanced Twisted-Pair - correct answer Type of wiring in which 2 conductors of a single circuit are twisted together in order t...

What is ORM? correct answers Decision making tool used by people at all levels to increase operational effectiveness, it increases our ability to make informed decisions, and minimizes risks to acceptable levels. Explain Identify hazards correct answers Begin with an outline or chart of the major steps in the operation, then conduct a preliminary hazard analysis by listing the hazards with each step along with possible causes for those hazards. Explain assess hazards correct answers For ea...

Which of the following is NOT a significant factor in determining the impact of an electrocution event on a worker? CORRECT ANSWER The amount of electrically resistant material present in work boots and work gloves A Hearing Conservation Program is required under OSHA regulation 29 CFR 1926.52 (Occupational Noise Exposure) when workers are exposed to noise levels in excess of an eight-hour time-weighted average of _________. CORRECT ANSWER 90 decibels (dB) Per 29 CFR 1926.1101, the concent...

Reflection - the bouncing back of a ray of light, sound, or heat when the ray hits a surface that it does not go through Refraction of light - occurs when wave of light passes from one medium to another and the light wave is bent or refracted. speed of light in a vacuum - It asserts that the speed of light in a vacuum has the same value in all directions and in all inertial reference frames. What if the bar of a magnet is broken in half? - New poles will form on the pieces of the magnet. ...

DoD Hearing Technician: Chapters 1-12 - Review Questions and Answers Which occupational sector accounts for the highest incidence of noise -induced hearing loss: a. Transportation b. Construction c. Mining d. Manufacturing d Noise exposures are considered likely to be harmful if shouting is required in order to communicate to a person _____feet away. a. 4 b. 3 c. 2 d. 5 b The primary role of CAOHC is: a. Advocate for comprehensive programs tha...

Upstream frequency ranges - between 5Mhz and 42Mhz Downstream frequency ranges - Between 50MHz 860MHz Upstream frequency ranges - 5MHz and 42 MHz A 6 MHz downstream channel can hold - 2-4 hd channels or 8-12 standard definition channels Egress - When a signal leaks out of a cable Ingress - when a signal leaks into a cable Field technicians are responsible from - The tap to the CPE (customer premise equipement) The most preferred BER is measured in ________ and is shown as _______ - Billio...

Choose Correct Term: 1. Attenuation, 2. Bandwidth, 3. Cable Loss, 4. Cladding, 5. Connector, 6. Dispersion, 7. Ferrule (Optical Fiber), 8. FC, 9. Furcating Harness, 10. Insertion Loss, 11. LC Connector/Adapter, 12. Multimode Optical Fiber, 13. SFF, 14. SC Definition: The decrease in magnitude or the power loss of a signal that propagates between points, expressed in decibels (dB) as the ratio of received signal to transmitted signal level. 2 - correct answer KEY TERMS Choose Correct...

The normal type of sprinkler system used where there is a risk of the system freezing is a: - correct answer Wet System. In order to help minimize exposures to risk at a structural fire scene, firefighters should: - correct answer Do a risk/benefit analysis for every action. What does NFPA 1500 require to be part of the fire department training programs? - correct answer A process for evaluating firefighter skills & knowledge. Following each use, the facepiece of a breathing appar...

Sound Waves - mechanical vibrations that induce alternate refraction and compression of any physical medium through which they pass. -should travel in a straight line compression - when sound waves come close together, opposite of rarefaction rarefaction - when sound waves are farther apart, opposite of compression higher frequency - a higher this equals a higher resolution! transverse wave - perpendicular to the way it's traveling longitudinal wave - moving in the same direction freque...