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Questions in engineering

[Done] What type of refrigeration system is considered a packaged system? A. Reach-in cooler or freezer B. Walk-in cooler or freezer C. Rack system D. Multiplex system

[Done] In which types of refrigeration systems would you find a crankcase pressure regulator? a) High-capacity chillers b) Residential air conditioners c) Reach-in freezers d) Walk-in freezers

[Done] You should never use a punch or chisel on what material?

[Done] Lockout prevents any unauthorized switching to remove and energize unintentionally the isolated equipment. Select one: A. false B. true

[Done] A vertical gate in a dam has the shape of an isosceles trapezoid 8 feet across the top and 6 feet across the bottom, with a height of 5 feet, as shown below. What is the liquid pressure on the gate if the top of the gate is 4 feet below the surface of the water? Hint: Density of water [tex]$=62.4 lb / ft ^3$[/tex]. Round your answer to the nearest pound.

[Done] Why is labor the riskiest category of work on a project? Be brief in your explanation and make it specific to construction.

[Done] 1. Foam is ineffective against all of the following fire types EXCEPT A. Three-dimensional fires B. Class B fires C. Pressurized gases D. Class C fires E. Class D fires 2. The foam that is best suited to confined space fires is A. Film forming fluoroprotein (FFFP) B. Alcohol-resistant aqueous film forming (AR-AFFF) C. Alcohol-resistant film forming fluoroprotein (AR_FEED)

[Done] Which of the following is commonly used to tie a clove hitch to make it more secure? A. bowline B. half hitch C. square knot

[Done] Tools, materials, or debris shall not be allowed to accumulate in quantities on the scaffold to cause a hazard. A. FALSE B. TRUE

[Done] Listen. Choose all options that apply. What are the two most prohibitive disadvantages of using ammonia in refrigeration systems? a) Ammonia corrodes copper pipes and tubing. b) It's unusually costly. c) Tanks that carry ammonia are unusually heavy. d) High concentrations of ammonia vapor are deadly.