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Questions in engineering

[Free] What is the difference between a 90 percent furnace with a sealed combustion system and a typical 90 percent furnace? Select one: A. Sealed combustion units use household vented air for combustion. B. Sealed combustion units require combustion air to be piped in from the outside. C. Sealed combustion units may use PVC pipe for venting material. D. Sealed combustion units do not produce any combustion products.

[Free] Solve the initial value problem below using the method of Laplace transforms. [tex]w^{\prime \prime}-12 w^{\prime}+36 w=180 t+696, w(-4)=-5, w^{\prime}(-4)=-25[/tex] Click here to view the table of Laplace transforms. Click here to view the table of properties of Laplace transforms. [tex]w(t)=\square[/tex] (Type an exact answer in terms of [tex]e[/tex].)

[Free] Portable Safety grounds shall be removed in what order to which they are applied? A. Same B. Reverse C. Any arrangement

[Free] Which of the following are terms used to describe welded wire fabric? (Select all that apply) A. Structural welded wire reinforcement B. Building fabric C. Welded wire mesh D. Criss-crossed steel reinforcing E. Pipe fabric

[Free] Which of the following would NOT indicate damaged synchronizer or other shift mechanism problems? A. A noise while stopped B. Loose shifting C. Jumping out of gear D. Sloppy shifting

[Free] Which of the following descriptions best fits an analog output? A. Is either on or off. B. Processes up to 10,000 signals per second. C. Converts readings to an electrical signal. D. A variable output

[Free] THE CONCRETE MIXED AND DELIVERED BY A MIXING TRUCK MUST BE DELIVERED AND DISCHARGED BEFORE THE DRUM HAS REVOLVED 300 TIMES. True False

[Free] Analog outputs are somewhere in between the off and on signals and can be used for which of the following (select all that apply)? temperature sensors any sensors that measures quantity inverter contacts and proximity switches safety relay contacts machine alarms push buttons a variable power supply buzzers current and voltage sensors set a speed for a fan or motor valve position actuator lights

[Free] CONCRETE IS USUALLY PREPARED IN STATIONS. True False

[Free] Although rebar supports come in various materials, concrete chairs are the most commonly used support for the bottom steel in a reinforced concrete slab resting directly on the ground. True False