WorksheetsProfile projector_thread_Surface
Total questions: 15
Worksheet time: 8mins
What is the main function of a profile projector?
To measure color intensity
To magnify and measure component profiles accurately
To check surface roughness
To measure temperature differences
Which of the following dimensions can be measured using a profile projector?
Hardness
Density
Length, angle, radius, and diameter
Weight
In the contour illumination method, the workpiece is illuminated from:
The front
The side
Behind the object
Below the stage
What is the correct cleaning method for a projection lens?
Use rough cloth
Use blower brush and high-grade alcohol
Wash with water
Wipe with paper towel
Which of the following is a good maintenance practice for the screen glass of a profile projector?
Clean using soft cloth soaked with dilute neutral detergent
Use sandpaper to remove stains
A screw is best described as:
A shaft with a helical groove on its surface
A flat plate with grooves
A plain cylindrical rod
A spring-type component
The term 'pitch' in screw thread refers to:
The height of the thread
The distance between two adjacent thread peaks
The angle of the thread
The core diameter
Which type of thread is commonly used for transmitting motion?
Vee thread
Square thread
Metric thread
Pan head thread
Which of the following instruments can be used to measure screw thread parameters?
Vernier caliper
Thread micrometer with 3 wires
Bevel protractor
Dial indicator only
What are the three main parameters of a screw thread in ISO class of fit?
Pitch, crest angle, and length
Major diameter, minor diameter, and pitch diameter
Surface roughness refers to:
Waviness caused by large shape errors
Fine irregularities on a surface
Color variation on material
Thickness of coating
Which parameter represents the arithmetic average of surface heights?
Rt
Ra
Rz
Rp
Which method uses a stylus that physically traces the surface profile?
Non-contact method
Contact method
Optical interferometry
Comparison with standard specimen
Why is surface roughness important in engineering?
It affects color brightness
It influences lubrication, friction, and fatigue resistance
It controls the size of a component
It reduces the hardness of metal
Which industry relies on precise surface roughness control for engine components?
Textile industry
Automotive industry
