Postal Exam 955 –Exam Questions With Accurate Answers
What happens when you use a longer lever arm? - accurate answers-Increases
torque, making it easier to lift heavy objects.
What type of motion do gears transfer? - accurate answers-Rotary motion.
What is the purpose of a flywheel? - accurate answers-To store rotational
energy and stabilize motion.
What does a camshaft do in a machine? - accurate answers-Converts rotary
motion into reciprocating motion.
What is the purpose of a clutch? - accurate answers-To engage or disengage
power transmission.
What component reduces friction between two moving parts? - accurate
answers-Bearing.
In a belt and pulley system, what determines speed ratio? - accurate answers-
The size of the pulleys.
What type of simple machine is a screw? - accurate answers-An inclined plane
wrapped around a cylinder.
Which direction will the driven gear turn if the driver turns clockwise? -
accurate answers-Counterclockwise.
What is the primary function of a spring? - accurate answers-To store
mechanical energy.
What happens to mechanical advantage as you increase the number of
pulleys? - accurate answers-It increases.
What kind of motion do pistons in a cylinder produce? - accurate answers-
Linear (reciprocating) motion.
What tool is used to check shaft alignment? - accurate answers-Dial indicator.
,What type of maintenance is performed on a regular schedule? - accurate
answers-Preventive maintenance.
What is a fastener? - accurate answers-A hardware device that mechanically
joins two or more objects.
What is thread pitch? - accurate answers-The distance between threads on a
screw.
What is a torque limiter used for? - accurate answers-To prevent over-
tightening.
What is a universal joint used for? - accurate answers-To transmit torque and
rotation at an angle.
What is backlash in gear systems? - accurate answers-The small gap between
gear teeth to allow movement.
What is the unit of electrical resistance? - accurate answers-Ohm (Ω)
What does a fuse do? - accurate answers-Protects a circuit by breaking it
when current is too high.
What is the purpose of a circuit breaker? - accurate answers-Automatically
interrupts current flow in overload conditions.
What is a short circuit? - accurate answers-When current flows through an
unintended, low-resistance path.
What tool is used to test continuity? - accurate answers-Multimeter.
What is the standard U.S. household voltage? - accurate answers-120 volts AC.
What is an open circuit? - accurate answers-A circuit where the flow of
current is interrupted.
What is a ground wire for? - accurate answers-To safely direct stray electrical
current to the earth.
, What is the symbol for a diode? - accurate answers-A triangle pointing to a
line.
What does a relay do? - accurate answers-Electrically operated switch.
What happens when resistors are added in series? - accurate answers-Total
resistance increases.
What happens when resistors are added in parallel? - accurate answers-Total
resistance decreases.
What is the unit of electrical power? - accurate answers-Watt (W)
What is Kirchhoff's Current Law? - accurate answers-The total current
entering a junction equals the total leaving.
What is capacitance measured in? - accurate answers-Farads (F)
What is the symbol for a ground connection in a schematic? - accurate
answers-Three horizontal lines decreasing in length.
What kind of current do batteries produce? - accurate answers-Direct current
(DC).
What is a rheostat? - accurate answers-A variable resistor.
What is a transformer used for? - accurate answers-To step voltage up or
down.
What's the purpose of an electrical junction box? - accurate answers-To house
and protect electrical connections.
What is the first step in troubleshooting a machine? - accurate answers-
Identify and verify the problem.
What does PPE stand for? - accurate answers-Personal Protective Equipment.
What color are caution signs typically? - accurate answers-Yellow.
What happens when you use a longer lever arm? - accurate answers-Increases
torque, making it easier to lift heavy objects.
What type of motion do gears transfer? - accurate answers-Rotary motion.
What is the purpose of a flywheel? - accurate answers-To store rotational
energy and stabilize motion.
What does a camshaft do in a machine? - accurate answers-Converts rotary
motion into reciprocating motion.
What is the purpose of a clutch? - accurate answers-To engage or disengage
power transmission.
What component reduces friction between two moving parts? - accurate
answers-Bearing.
In a belt and pulley system, what determines speed ratio? - accurate answers-
The size of the pulleys.
What type of simple machine is a screw? - accurate answers-An inclined plane
wrapped around a cylinder.
Which direction will the driven gear turn if the driver turns clockwise? -
accurate answers-Counterclockwise.
What is the primary function of a spring? - accurate answers-To store
mechanical energy.
What happens to mechanical advantage as you increase the number of
pulleys? - accurate answers-It increases.
What kind of motion do pistons in a cylinder produce? - accurate answers-
Linear (reciprocating) motion.
What tool is used to check shaft alignment? - accurate answers-Dial indicator.
,What type of maintenance is performed on a regular schedule? - accurate
answers-Preventive maintenance.
What is a fastener? - accurate answers-A hardware device that mechanically
joins two or more objects.
What is thread pitch? - accurate answers-The distance between threads on a
screw.
What is a torque limiter used for? - accurate answers-To prevent over-
tightening.
What is a universal joint used for? - accurate answers-To transmit torque and
rotation at an angle.
What is backlash in gear systems? - accurate answers-The small gap between
gear teeth to allow movement.
What is the unit of electrical resistance? - accurate answers-Ohm (Ω)
What does a fuse do? - accurate answers-Protects a circuit by breaking it
when current is too high.
What is the purpose of a circuit breaker? - accurate answers-Automatically
interrupts current flow in overload conditions.
What is a short circuit? - accurate answers-When current flows through an
unintended, low-resistance path.
What tool is used to test continuity? - accurate answers-Multimeter.
What is the standard U.S. household voltage? - accurate answers-120 volts AC.
What is an open circuit? - accurate answers-A circuit where the flow of
current is interrupted.
What is a ground wire for? - accurate answers-To safely direct stray electrical
current to the earth.
, What is the symbol for a diode? - accurate answers-A triangle pointing to a
line.
What does a relay do? - accurate answers-Electrically operated switch.
What happens when resistors are added in series? - accurate answers-Total
resistance increases.
What happens when resistors are added in parallel? - accurate answers-Total
resistance decreases.
What is the unit of electrical power? - accurate answers-Watt (W)
What is Kirchhoff's Current Law? - accurate answers-The total current
entering a junction equals the total leaving.
What is capacitance measured in? - accurate answers-Farads (F)
What is the symbol for a ground connection in a schematic? - accurate
answers-Three horizontal lines decreasing in length.
What kind of current do batteries produce? - accurate answers-Direct current
(DC).
What is a rheostat? - accurate answers-A variable resistor.
What is a transformer used for? - accurate answers-To step voltage up or
down.
What's the purpose of an electrical junction box? - accurate answers-To house
and protect electrical connections.
What is the first step in troubleshooting a machine? - accurate answers-
Identify and verify the problem.
What does PPE stand for? - accurate answers-Personal Protective Equipment.
What color are caution signs typically? - accurate answers-Yellow.
