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Power Tools NCCER| Full Revision
Guide| Complete Questions and
Answers| A+
A worker cuts through sheet metal using a jigsaw with a fine-tooth blade. Sparks fly and the
blade wears out fast.
They probably used the wrong blade type. Fine-tooth blades are better for wood or soft
plastics—metal needs a tougher, coarser bi-metal blade or carbide-tipped one.
A cordless drill keeps stopping when pressure is applied to the trigger, even with a full battery.
The motor could be overheating or the clutch setting might be too low. Also, worn brushes or
a jammed gearbox can cause that stalling too.
An apprentice adjusts the guard on an angle grinder while it’s plugged in.
That’s unsafe. Guards should only be adjusted when the tool is unplugged to prevent
accidental start-up and injury.
A reciprocating saw blade keeps slipping out mid-cut.
The blade might not be locked in properly or the chuck mechanism could be worn. Either
way, it’s dangerous and needs checking before use.
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During inspection, a circular saw has frayed cords but still runs fine.
It shouldn’t be used. Even if it runs, frayed cords are a shock hazard and violate safety
standards. Tag it out and report it.
A grinder emits a burning smell and slows down during use.
That’s a red flag for motor problems—maybe worn brushes or overheating. Stop using it and
report it before it fails completely.
You notice arcing inside the drill motor vents while it's running.
That’s not normal. Arcing usually means the brushes are worn out or there's internal damage.
It needs servicing before it's used again.
A worker uses a pneumatic nail gun and double-fires frequently.
That could be due to trigger sensitivity or holding the gun too firmly against the surface. It
might also need trigger adjustment or lubrication.
A tool’s tag reads “Double Insulated” but it has no ground prong.
That’s fine. Double insulated tools are designed to be safe without a ground wire, so no third
prong is needed.
A circular saw blade binds and kicks back during a rip cut.
Could be several things: not enough blade clearance, dull teeth, or forcing the cut too fast.
Also, if the material pinches, it can cause kickback.
Power Tools NCCER| Full Revision
Guide| Complete Questions and
Answers| A+
A worker cuts through sheet metal using a jigsaw with a fine-tooth blade. Sparks fly and the
blade wears out fast.
They probably used the wrong blade type. Fine-tooth blades are better for wood or soft
plastics—metal needs a tougher, coarser bi-metal blade or carbide-tipped one.
A cordless drill keeps stopping when pressure is applied to the trigger, even with a full battery.
The motor could be overheating or the clutch setting might be too low. Also, worn brushes or
a jammed gearbox can cause that stalling too.
An apprentice adjusts the guard on an angle grinder while it’s plugged in.
That’s unsafe. Guards should only be adjusted when the tool is unplugged to prevent
accidental start-up and injury.
A reciprocating saw blade keeps slipping out mid-cut.
The blade might not be locked in properly or the chuck mechanism could be worn. Either
way, it’s dangerous and needs checking before use.
, 2
During inspection, a circular saw has frayed cords but still runs fine.
It shouldn’t be used. Even if it runs, frayed cords are a shock hazard and violate safety
standards. Tag it out and report it.
A grinder emits a burning smell and slows down during use.
That’s a red flag for motor problems—maybe worn brushes or overheating. Stop using it and
report it before it fails completely.
You notice arcing inside the drill motor vents while it's running.
That’s not normal. Arcing usually means the brushes are worn out or there's internal damage.
It needs servicing before it's used again.
A worker uses a pneumatic nail gun and double-fires frequently.
That could be due to trigger sensitivity or holding the gun too firmly against the surface. It
might also need trigger adjustment or lubrication.
A tool’s tag reads “Double Insulated” but it has no ground prong.
That’s fine. Double insulated tools are designed to be safe without a ground wire, so no third
prong is needed.
A circular saw blade binds and kicks back during a rip cut.
Could be several things: not enough blade clearance, dull teeth, or forcing the cut too fast.
Also, if the material pinches, it can cause kickback.
