ENGR 311 Lecture 12 Test Questions and Answers Already Passed Latest Version 2025-2026
What are permament fasteners - Answers Fasteners that will never be removed unless they are
broken. (wielding, glues
True or false. Removable or temporary fasteners should not be untie itself. - Answers True
What is the difference between a bolt and stud - Answers Bolt has an hexagonal head and goes
all the way through the 2 materials and is connected with a nut. A stud goes through the first
material and is stuck in the second components.
What do keys do - Answers They transfer motion.
Why must the external and internal threads be compatible. - Answers So that they don't break
each other
What are the 3 types of common thread forms - Answers Knuckle, Square and Acme, buttress
What is the pitch - Answers Any distance corresponding to the roots or crest
What is the pitch diamter - Answers Average between the major and minor diameter
What is the lead. - Answers Distance moved when we make a 360 degree turn.
True of false. We can use an Imperial fasteners with a metric bolt. - Answers False.
Class 1A and 1B. What does the A and B represent - Answers A is for external threading and B is
for internal threading or holes.
Class 1A and 1B / Class 2A and 2B/ Class 3A and 3B. What is the difference between 1,2,3 -
Answers 1 is for loose fit. 2 is commercial fit. 3 is snug fit.
What is the nominal diameter. Ex: M14 - Answers Standard designation. When we want to buy
something.
.750-10 UNC- 2A. What does that .750 represent - Answers Nominal diamter
.750-10 UNC- 2A. What does that 10 represent - Answers Teeth per inches.
.750-10 UNC- 2A. What does that UNC represent - Answers Thread Series
If we want to increase the number of hours of machine working hours and reduce the hours of
maintenance, which type of threading should we use. - Answers Fine threading. Can handle
stronger stress and doesn't loosen itself as easy under vibration so less maintenance
What are the 3 types of thread designation - Answers UNC (corse) UNF (fine) UNEF (extra fine,
very expensive, specialized application only)
What are permament fasteners - Answers Fasteners that will never be removed unless they are
broken. (wielding, glues
True or false. Removable or temporary fasteners should not be untie itself. - Answers True
What is the difference between a bolt and stud - Answers Bolt has an hexagonal head and goes
all the way through the 2 materials and is connected with a nut. A stud goes through the first
material and is stuck in the second components.
What do keys do - Answers They transfer motion.
Why must the external and internal threads be compatible. - Answers So that they don't break
each other
What are the 3 types of common thread forms - Answers Knuckle, Square and Acme, buttress
What is the pitch - Answers Any distance corresponding to the roots or crest
What is the pitch diamter - Answers Average between the major and minor diameter
What is the lead. - Answers Distance moved when we make a 360 degree turn.
True of false. We can use an Imperial fasteners with a metric bolt. - Answers False.
Class 1A and 1B. What does the A and B represent - Answers A is for external threading and B is
for internal threading or holes.
Class 1A and 1B / Class 2A and 2B/ Class 3A and 3B. What is the difference between 1,2,3 -
Answers 1 is for loose fit. 2 is commercial fit. 3 is snug fit.
What is the nominal diameter. Ex: M14 - Answers Standard designation. When we want to buy
something.
.750-10 UNC- 2A. What does that .750 represent - Answers Nominal diamter
.750-10 UNC- 2A. What does that 10 represent - Answers Teeth per inches.
.750-10 UNC- 2A. What does that UNC represent - Answers Thread Series
If we want to increase the number of hours of machine working hours and reduce the hours of
maintenance, which type of threading should we use. - Answers Fine threading. Can handle
stronger stress and doesn't loosen itself as easy under vibration so less maintenance
What are the 3 types of thread designation - Answers UNC (corse) UNF (fine) UNEF (extra fine,
very expensive, specialized application only)
