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Questions in engineering

[Free] Number the NFPA's steps for de-energizing equipment to place them in the correct order. A. Perform lockout/tagout B. Discharge and/or block any remaining stored energy before working on equipment C. Turn off all energized components and disconnect all power sources D. Test circuits with an appropriately-rated voltage meter E. Locate all power sources F. Release all stored electrical energy and release or block stored mechanical energy

[Free] Tools that have a case made of nonconductive material and have been constructed so that the case is insulated from electrical energy are called: A. Fibrillation B. Error precursors C. Double-insulated/ungrounded tools D. Polychlorinated biphenyls (PCBs) E. Qualified person F. Ground fault circuit interrupter (GFCI) G. Grounded tool

[Free] When performing an instant OFF test, all sources of cathodic protection current must be: a. Left on except the one closest to the surveyor b. Interrupted at the same time c. Set to the same output current level d. Set to the same output voltage level

[Free] When producing a hole in concrete or masonry, it is best to use a(n): A. impact driver B. hammer drill C. power screwdriver D. reciprocating saw

[Free] What is the difference between a hermetic and a semi-hermetic compressor? A. A hermetic compressor has all parts enclosed in a welded shell. B. A semi-hermetic compressor has a motor with valves above the cylinders. C. A semi-hermetic compressor has pistons and a crankshaft.

[Free] The basic difference between soldering and brazing is the temperature at which the filler metal flows. True or False

[Free] What is the first step in fire prevention on a construction site? A. Installing fire alarms B. Site inspection C. Training employees D. Contacting the Fire Department

[Free] Safety rules that apply to commercial industrial installations for motor control include the following: I. Never comply with the NEC, state, and local codes. II. Use UL-listed equipment, components, and test equipment. III. Before removing any fuse from a circuit, be sure the switch for the circuit is open or disconnected and properly verify the circuit is de-energized. IV. Always use safety equipment. A. I, II, III, and IV B. I and IV C. II and III D. II, III, and IV

[Free] Select the best answer for the question. Which of the following actions could create a water hammer? A. Quickly closing a valve B. Replacing steel pipes with copper C. Relocating a steam trap D. Venting the expansion tank

[Free] Match the following tools and instruments with their identifying phrases. Tool used to line up holes in mating parts. [Choose] Size-adjustable tool used for bending and gripping. [Choose] Tool with a slight opening in the gripping head. [Choose] Instrument used to measure values around atmospheric pressure. [Choose] Tool used mainly in electrical tasks for cutting and gripping. [Choose] Instrument comprising a collection of meters measuring different electrical variables. [Choose]