On a commercial refrigeration system with hot-gas defrost, what does the compressor do during the defrost cycle?
A) It shuts off.
B) It runs backwards to pump hot gas into the evaporator.
C) It operates to provide the heat for defrost.
D) It cycles like it normally would.
C
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A six cylinder engine uses six fuel injectors connected electrically in two groups of three injectors in parallel. What would be the resistance if three 12-ohm injectors were connected in parallel?
A) 12 ohms B) 36 ohms C) 4 ohms D) 3 ohms
A 5/16-in bolt with national coarse threads will have:
A) 16 threads per inch. B) 18 threads per inch. C) 24 threads per inch. D) 20 threads per inch.
?Which of the following is a form that flux is available as?
A. ?rings B. ?washers C. ?sheets D. ?All of the above
The twisting force used to turn a fastener against the friction between the threads and between the head of the fastener and the surface of the component is called _____.
A. twist B. rotation C. power D. torque