Most piston compressors use what type of valves?

A) Poppet
B) Reed
C) Sliding
D) On-off gate-type valve


B) Reed

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The three basic causes of electrical incidents include unsafe conditions, unsafe equipment, and _____.

a. unsafe acts b. unsafe or improper PPE c. lack of procedures d. unsafe weather

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(Circle one) (NIOSH, OSHA) considers a gas to have adequate warning properties when its odor, taste or irritant effects are detectable and persist at concentrations below the recommended exposure level.

What will be an ideal response?

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To remove the refrigerant from a system without any testing or processing and to be put back into the same system is called ____.

A. recovery B. renew C. reclaim D. recycle

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Which type of thread standard uses more threads per inch?

A) National coarse (NC) B) National fine (NF) C) AHRI standard threads D) Pipe threads

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