Which type of fire extinguisher is most appropriate for a Class A fire involving materials like wood, paper, and textiles in an engineering workshop?
Workshop Safety And First Aid
Question · Easy
In the event of a Class B fire involving petrol, diesel, or lubricating oils in a machine shop, which substance must NEVER be used to extinguish it?
What is the recommended first step when dealing with a Class C gas fire, such as a leaking acetylene or butane hose, in a welding bay?
Question · Medium
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Which extinguishing agent is specifically formulated to combat a Class D fire involving combustible metals like magnesium chips or sodium in a machine shop?
Question · Hard
When extinguishing a fire in an electrical control panel that is still energized, which extinguisher type must be used to prevent electrical shock to the operator?
If a workshop assistant sustains a chemical burn from battery acid or pickling solution on their arm, what is the correct immediate first-aid action?
You find a colleague lying unconscious and still in contact with a live electrical conduit in the workshop. What should you do first?
According to the safety regulations of the Nigerian Factory Act, what is the primary duty of an employer regarding Personal Protective Equipment (PPE)?
What are the standard color codes for oxygen and acetylene cylinders used in gas welding workshops under Nigerian and international safety practices?
What is the primary function of a flashback arrestor installed on a gas welding or cutting blowpipe setup?
When operating a pedestal grinding machine in a metal fitting workshop, why is it mandatory to wear industrial safety goggles even if the machine has a transparent safety shield?
At what continuous noise exposure level in an engineering workshop is it mandatory for an employer to provide hearing protection under standard occupational safety regulations?
How should oily rags and cotton waste used for cleaning machines be stored in a workshop to prevent spontaneous combustion?
What is the meaning of a blue circular safety sign featuring a white symbol in an engineering workshop?
What is the correct first-aid response for a minor thermal burn on a worker's hand caused by touching a hot welded joint?
Which direction should the teeth of a hacksaw blade face when mounting the blade onto a hand hacksaw frame?
Mechanical Tools And Bench Work
What is 'pinning' in hand filing operations, and how is it corrected by a craftsman?
What is the recommended cutting angle (point angle) of a flat cold chisel when used for chipping mild steel?
What is the primary function of a scratch awl in sheet metal and woodworking layout operations?
What is the difference in point angle and application between a prick punch and a center punch?
Which type of hammer is characterized by one flat face and one hemispherical face, and is commonly used for hand riveting and peening metal?
When cutting internal threads manually in a blind hole, in what sequence should the three taps in a standard tap set be used?
Which tool is used to hold and rotate a threading die to cut external threads on a steel rod?
In timber joinery, which joint consists of a projecting tongue inserted into a matching rectangular socket to form a strong 90-degree corner frame?
Why is a dovetail joint highly preferred for constructing heavy-duty drawers and wooden chests in joinery?
Which sheet metal stake features a conical horn on one side and a flat rectangular anvil on the other, used for forming cones and square bends?
What does the industry-standard color coding on aviation snips signify to a sheet metal craftsman?
What is the process of 'hemming' in sheet metal work, and what is its primary purpose?
In precision bench work, what is the purpose of hand scraping a metal surface rather than grinding it?
What is the primary function of a reamer tool in bench fitting operations?
In a center lathe machine operation, what is the feed direction when performing a 'facing' operation?
Machine Shop Practice
During straight turning on a lathe, how does the cutting tool move relative to the workpiece?
Which lathe operation involves embossing a diamond-shaped or straight pattern on a metal cylinder, and what speed setting should be used?
When turning an irregular or eccentric casting on a lathe, which chuck type should a craftsman select?
What is 'glazing' on a grinding wheel, and how does a craftsman restore the wheel's cutting efficiency?
Using the metric cutting speed formula RPM = (1000 * CS) / (pi * D), calculate the spindle speed (RPM) required to drill a hole with a 20 mm drill bit in mild steel (recommended cutting speed CS = 30 m/min). [Take pi approx 3.14]
What is defined as the 'feed' of a drill bit on a drilling machine?
Which lathe accessory is held in the tailstock spindle to drill accurate center holes in the end of a round bar?
What are the two primary functions of a cutting fluid (coolant) during heavy machining operations in a machine shop?
Before mounting a new grinding wheel onto a grinding machine, what safety test must a craftsman perform to detect hidden internal cracks?
In milling machine operations, what is the distinction between 'up-milling' (conventional) and 'down-milling' (climb)?
Which component of a lathe machine bed is engaged to feed the carriage automatically during thread cutting?
Which part of the lathe carriage houses the gears, clutches, and half-nut lever used to control carriage movement?
Where is the single-point cutting tool clamped on a lathe machine?
When turning a very long and slender steel shaft, what lathe accessory must be used to support the shaft and prevent it from bending under the cutting tool pressure?
In Shielded Metal Arc Welding (SMAW/manual arc), what is the primary purpose of the chemical flux coating on the electrode?
Welding And Fabrication
Which gas or gas mixture is most commonly used as a shielding gas in Gas Metal Arc Welding (GMAW / MIG) of mild steel?
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