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Questions in engineering

[Jawaban] No more than how many mV difference should be between an Unknown Condition and a Known Good reference electrode? A. 2.5 mV B. 5 mV C. 10 mV D. 10.5 mV

[Jawaban] Which protective device protects against overcurrent situations and can be reset? A. Circuit breaker B. Ground-fault circuit-interrupter and disconnect all C. Fuse D. All of the above

[Jawaban] Why is it important to have an emergency rescue plan at an excavation site? A. To increase work speed in the confined space B. To plan what to do before an accident C. To reduce project costs D. To document the different chemicals in use

[Jawaban] Select the best answer for the question. What is the internal heat gain, in kW, from a factory with 20 kW of lighting (surface-mounted), 10 kW of running motors, and 10 people doing light benchwork? A. 23.8 B. 178 C. 208 D. 20

[Jawaban] When performing a system ON test, you get a pipe-to-soil potential reading of -870 millivolts. Which statement is TRUE? A. The protection area is too large for the anodes provided B. The anodes are depleted or were never connected C. Your voltmeter is probably defective D. This is a good reading

[Jawaban] Which type of force do tools for threaded fasteners apply? POSSIBLE ANSWERS A. Pushing B. Pulling C. Rotational D. Linear

[Jawaban] Typically, when performing a close interval potential survey, pipe-to-soil potential readings are taken: a. No more than 30 feet from the test station b. Every 2.5 to 5 feet along the pipeline's length c. On only 1% of the pipeline's entire length d. Every 100 feet along the pipeline's length

[Jawaban] 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

[Jawaban] 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

[Jawaban] 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