WorksheetsSheet Metal Fabrication - Quiz 10
Total questions: 16
Worksheet time: 8mins
Identify the correct first operation in producing a right segment bend 150 mm in diameter for sheet metal work.
Determine the number of segments and the joining method to be used before any marking out
Proceed directly to final inspection to confirm quality
Weld up the segments before rolling
Set the rolling machine and roll up each segment as the first step
Cut out the template segment without any prior planning
Select all statements that correctly describe the terms machine loading and scheduling in manufacturing.
Machine loading establishes the effective capacity of a machine or process to ensure the best use of plant and personnel
Scheduling represents the time taken to carry out a task or process before moving on to the next, either machine or human
Machine loading is the order in which jobs are queued on a machine
Scheduling is only the allocation of people and never of equipment
Scheduling is unrelated to task duration
Which statement best explains cumulative error with regard to dimensional accuracy in marking and measuring?
Error accumulates when dimensions are taken from successive marks rather than a single datum edge
Error is eliminated by adding the next size to the last dimension
Cumulative error only occurs when measuring with digital tools
Cumulative error is the difference between tolerance limits
Cumulative error results exclusively from thermal expansion
How does a light beam curtain safeguard on a power guillotine function?
A light beam between a transmitter and receiver prevents operation when the beam is broken until the beam is restored
The machine operates only when the operator wears reflective clothing
The curtain increases blade speed when light is detected
A light beam triggers lubrication when interrupted
It dims the workspace lighting to reduce glare
Select the methods that preserve polished surfaces (e.g., stainless steel or aluminium) during forming processes.
Do not remove protective film during forming
Ensure rollers, folders, and forming tools are free from marks, damage, or foreign bodies
Cover surfaces to be formed with heavy paper or light card
Use sacrificial sheet metal to cover the surface
Use rough steel brushes on polished areas to improve grip
Which description correctly explains a closed loop control system on a machine tool?
The exact position and traversing rate of slides are monitored by a measuring device, converted by a transducer, and fed back to the control unit
Slides are moved manually and checked visually by the operator, with no feedback to the control unit
The control unit sends commands without any position feedback from the slides
A closed loop only adjusts spindle speed, not slide position
The system relies solely on mechanical stops without sensors
Select the advantages of CNC machines over conventional equipment.
A programmed CNC machine repeats the complete requirements for a component with very high accuracy
Component quality is not reliant on the operator
Ease of updating drawings and components
CNC machines cannot repeat operations reliably
CNC machines make manual layout mandatory for every part
What is the typical composition of Tinman’s solder by percentage?
60% tin and 40% lead
50% tin and 50% lead
40% tin and 60% lead
60% lead and 40% tin
55% tin and 45% lead
What is the approximate melting range of Tinman’s solder?
183–188 degrees centigrade
150–160 degrees centigrade
200–210 degrees centigrade
120–130 degrees centigrade
95–100 degrees centigrade
For joining two 2 mm low carbon steel plates with 3 mm round (snap) headed solid rivets, what is the preferred rivet material and the reason?
Low carbon steel, to prevent corrosion between rivet and plate
Stainless steel, to improve appearance only
Aluminium, to reduce weight regardless of corrosion
Copper, to avoid work hardening
Brass, to match the color of the plates
Calculate the required rivet shank length to produce the joint when using a 3 mm round (snap) headed solid rivet on two 2 mm low carbon steel plates.
8.5 mm
6.0 mm
10.0 mm
4.5 mm
7.0 mm
How can a section of square ducting be checked for squareness?
Measure the diagonals; equality indicates squareness
Measure only one side length
Check by tapping the corners and listening for resonance
Weigh the duct and compare to a specification
Use a spirit level on any single face
Which statement defines tolerance in dimensional measurement?
It is the difference between the upper and lower limits of size for a dimension; if the actual size lies within these limits, it is acceptable
It is the exact nominal size specified on a drawing
It is the maximum error allowed only on the upper side of a dimension
It is the average of multiple measurements
It is the deviation caused by tool wear
Select the correct definitions of Datum Edge and Datum Surface.
Datum Edge: the edge of a component where all relative dimensions are taken from
Datum Surface: the surface that all relative dimensions are taken from
Datum Edge: any arbitrary line drawn during marking without reference
Datum Surface: a decorative finish unrelated to measurement
Datum Edge: the longest edge regardless of measurement practices
Select the correct uses for each tool or aid listed.
Vernier height gauge: accurate marking of lines from a datum surface
Vernier caliper: accurate measurement of a round component
Templates: checking roundness of a circular component
Vernier height gauge: checking electrical continuity
Templates: measuring mass of a component
Select the correct definitions of malleability and ductility.
Malleability: ability to be formed into shapes without fracture
Ductility: ability to be drawn out or stretched without fracture
Malleability: ability to resist elastic deformation
Ductility: ability to rebound after impact
Malleability: property of electrical conductivity only
