Question 513General Subjects - Assistant Engineer
70% to passThe letters 'NC' in '1/4-20 NC' indicates the bolt is _______________.
Amade of non-corrosive metal
Bmade of nickel-cadmium metal
Cnot clad with any coating
Dthreaded with national coarse threads
AI Explanation
The correct answer is D) threaded with national coarse threads. The letters "NC" in "1/4-20 NC" refer to the thread designation "National Coarse," which is a standard thread type used in the United States. The "1/4-20" indicates the bolt diameter (1/4 inch) and threads per inch (20). So, the "NC" designation specifically means the bolt is threaded with the national coarse thread pattern, which is a common thread type used in many industrial and mechanical applications. The other answer choices are incorrect because they do not accurately describe the meaning of the "NC" designation in the bolt specification.
Related Questions
Q449:Concerning air conditioning system hot water heating coils, what statement is tr... Q661:Rudder position is shown on the bridge by the _______________. Q310:What statement represents the first law of thermodynamics? Q12:With regard to a ballast system associated with a dry cargo ship, what is the pr... Q160:While starting a hydraulic anchor windlass, you observe that hydraulic pressure ...
Ready to test your knowledge?
Take a General Subjects - Assistant Engineer Practice ExamOfficial Resources