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Questions in engineering

[Free] Any overhead power line should be considered energized unless the entity owning or operating the electrical utility supplying the line certifies that it is: A. Not energized B. Visibly grounded C. Tested for zero energy D. All the above

[Free] Where does refrigerant go after it leaves the purge unit of a low-pressure centrifugal system? A. The evaporator B. The condenser C. The compressor intercooler D. The recovery service vessel

[Free] According to NFPA 70E, in the process for verifying an electrical safe work condition, what step is identified as "After properly interrupting the load current, open the disconnecting device(s) for each source"? A. Step 1 B. Step 2 C. Step 3 D. Step 4 E. Step 5

[Free] What is the unit of measure for resistance?

[Free] Which of the following does not occur during the intake stroke of a reciprocating compressor? A. Pressure drops B. Vapor enters cylinder C. Suction valve opens D. Discharge valve opens

[Free] 1. When is the solid die - nut used? 2. Name two (2) precautions to be taken before welding an empty petrol tank. 3. Give one (1) use for each of the following materials: (i) Foam (ii) carbon dioxide. 4. Explain why mild steel plates are not used for food cans. Name suitable material. 5. Name three (3) types of drilling machine used in an industry. 6. What did you understand by the helix of a twist drill?

[Free] Select the best answer for the question. 9. The __________ should be drained, cleaned, and flushed on a regular basis. A. compressor and blower B. sump and all water lines C. evaporative condenser D. cooling tower basin

[Free] What type of ladder is best for electrical work? A. An aluminum ladder B. A wood ladder C. A fixed ladder made of steel D. An insulated, fiberglass ladder

[Free] What is a suction-cooled compressor? A. It has suction valves in the cylinder head. B. It has pistons and a crankshaft. C. Suction vapor cools the compressor motor. D. All its parts are enclosed in a welded shell.

[Free] To move an object from one place to another safely, you should eliminate ______ from the process. A. containers B. stairs C. the guesswork D. lights E. caution