30 Questions
What is the primary function of drill bits?
To remove material and create holes of circular cross-section
How do drill bits typically cut through a work piece?
By rotation only
In which country are fractional inch and gauge drill bit sizes commonly used?
United States
What is the most common increment of drill bit sizes available in a market stall?
1 mm
What was published in the United Kingdom in 1959?
British standards for replacing gauge size drill bits with metric sizes
Where can you find drill bits in 0.1-mm increments?
Engineers' store
What is the primary purpose of centre drills?
Drilling lathe centres
What is the standard included angle for centre drills?
60°
What is the tolerance range for standard-tolerance bolts?
+0.000 to -0.0055 in.
Why is cad plating not possible for close-tolerance bolts?
Close-tolerance bolts are manufactured to tight specs
What is the definition of a light drive fit for an AN hex bolt?
An interference fit with a clearance of 0.0006 in.
What can be done to eliminate friction during fitting of close-tolerance bolts?
Place the bolt in a freezer prior to fitment
What is the primary factor that determines the required temperature for a shrink fit?
Total expansion required
What is the increase in unit length of any section of metal in any direction for an increase in temperature of 1 °C?
Coefficient of linear expansion
Which of the following materials has the highest coefficient of linear expansion?
Nickel steel
What is the purpose of considering the allowance for shrinkage when calculating the total required expansion?
To ensure the correct fit of the piece
Which of the following heating methods is not listed as an option?
Laser heating
What is the purpose of using a refrigerator for cooling a piece?
To slowly cool the piece
What is the primary difference between interference fit and transition fit?
The size difference between the mating parts
What is the purpose of selective assembly in determining the type of fit?
To determine whether the fit is clearance or interference
What type of fit is characterized by a small size difference between the mating parts?
Transition fit
What type of fit requires the use of a hydraulic press for assembly?
Force fit
What is the primary characteristic of a running fit?
The shaft is designed to rotate in the hub
What is the purpose of finely finished and accurate surfaces in achieving a transition fit?
To produce very small differences in size
What is the primary method for inspecting a shaft or other part for bow?
Using a dial test indicator
What is the term used to describe the rotation of a shaft or component about its longitudinal axis?
Twist
What is the primary source of information for the inspection technique or method for twist?
Manufacturer's manual
What is the common method used to inspect compressor blades for bow?
Using feeler gauges and a straight edge
What is the purpose of reference lines or datum points on a shaft?
To compare to maintenance manual dimensions or limits
Which of the following is NOT a method of checking for wear?
Dynamometer
Identify the different types and sizes of drill bits, their uses, and how they are attached to a drill to create holes in various materials.
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