USPS Exam 955 Questions with
Complete Answers
How do you reverse the turn direction of a three-phase motor? - ANSWER-Switch 2
of the hot legs
What is EP grease best used for? - ANSWER-High temp low speed
Which will aid in the peak performance of a pneumatic system? - ANSWER-Storage
tank and accumulator
When replacing a fuse what is to be considered? - ANSWER-Voltage, Amperage,
Type
How do we increase the multiplication factor in a hydraulic system? - ANSWER-
smaller surface area piston to a larger one
If pressure regulator fails what component protects the system? - ANSWER-
Pressure relief valve
Why are key ways placed on a shaft? - ANSWER-To keep the pulley or gear from
turning on the shaft
In a pneumatic system what happens to the air when it is compressed? - ANSWER-
Volume is reduced and temperature is increased
RS232 format is considered? - ANSWER-Serial interface
The number 6-32 means what to a screw or a bolt? - ANSWER-6mm, 32 threads per
inch
What does 1/4-20 mean on a screw or bolt? - ANSWER-1/4" shaft, 20 threads per
inch
In the left-hand rule of magnetism, what direction does the thumb point? - ANSWER-
direction of current flow
What wrench indicates the tension on a bolt? - ANSWER-torque wrench
What is essential about oil? - ANSWER-Viscosity, cleanliness, grade
Heavier current is controlled by a - ANSWER-shunt
What is a spanner wrench used for? - ANSWER-To remove a spanner nut
Pilot light detection is produced through? - ANSWER-Thermocouple
, If a transistor is in saturation its state is: - ANSWER-shorted
If an overload torque limiter slips - ANSWER-It is operating normally
In oxy fuel welding, the screw for the diaphragm is turned - ANSWER-1/2 way open
What is the difference between oil and grease? - ANSWER-Oil has a resevoir, lower
viscosity, and oil flows
If amperage increases and voltage remains the same, what happened to the
resistance? - ANSWER-It decreased
What does a clutch allow for? - ANSWER-Engaging and disengaging
What are the parts to a motor? - ANSWER-Armature, Field magnet, Commutator,
and brushes
Force is defined as any action that tends to produce or modify - ANSWER-Motion
How is the "chatting" eliminated on an electrical motor braking system? - ANSWER-
Adjusting the gap
What type of gear has helical sharped teeth? - ANSWER-Helical gear
What is an idler gear used for? - ANSWER-To change direction of spin
What mechanical device can be used to create oscillating motion? - ANSWER-CAM
Potential energy is - ANSWER-stored energy
Electricity is the flow of what? - ANSWER-electrons
What is the measuring unit name of current? - ANSWER-Ampere
What are the formulas for Ohm's law? - ANSWER-V=IR, I=V/R, R=V/I
A capacitor blocks and passes what? - ANSWER-Blocks DC and passes AC
An electrical magnetic device which pulls in a plunger is called what? - ANSWER-
solenoid
What device converts electrical energy into mechanical energy? - ANSWER-motor
What device converts mechanical energy into electrical energy? - ANSWER-
generator
A __________ converts one type of energy to another. - ANSWER-Transducer
What type of current is commonly applied to a transformer? - ANSWER-AC
Complete Answers
How do you reverse the turn direction of a three-phase motor? - ANSWER-Switch 2
of the hot legs
What is EP grease best used for? - ANSWER-High temp low speed
Which will aid in the peak performance of a pneumatic system? - ANSWER-Storage
tank and accumulator
When replacing a fuse what is to be considered? - ANSWER-Voltage, Amperage,
Type
How do we increase the multiplication factor in a hydraulic system? - ANSWER-
smaller surface area piston to a larger one
If pressure regulator fails what component protects the system? - ANSWER-
Pressure relief valve
Why are key ways placed on a shaft? - ANSWER-To keep the pulley or gear from
turning on the shaft
In a pneumatic system what happens to the air when it is compressed? - ANSWER-
Volume is reduced and temperature is increased
RS232 format is considered? - ANSWER-Serial interface
The number 6-32 means what to a screw or a bolt? - ANSWER-6mm, 32 threads per
inch
What does 1/4-20 mean on a screw or bolt? - ANSWER-1/4" shaft, 20 threads per
inch
In the left-hand rule of magnetism, what direction does the thumb point? - ANSWER-
direction of current flow
What wrench indicates the tension on a bolt? - ANSWER-torque wrench
What is essential about oil? - ANSWER-Viscosity, cleanliness, grade
Heavier current is controlled by a - ANSWER-shunt
What is a spanner wrench used for? - ANSWER-To remove a spanner nut
Pilot light detection is produced through? - ANSWER-Thermocouple
, If a transistor is in saturation its state is: - ANSWER-shorted
If an overload torque limiter slips - ANSWER-It is operating normally
In oxy fuel welding, the screw for the diaphragm is turned - ANSWER-1/2 way open
What is the difference between oil and grease? - ANSWER-Oil has a resevoir, lower
viscosity, and oil flows
If amperage increases and voltage remains the same, what happened to the
resistance? - ANSWER-It decreased
What does a clutch allow for? - ANSWER-Engaging and disengaging
What are the parts to a motor? - ANSWER-Armature, Field magnet, Commutator,
and brushes
Force is defined as any action that tends to produce or modify - ANSWER-Motion
How is the "chatting" eliminated on an electrical motor braking system? - ANSWER-
Adjusting the gap
What type of gear has helical sharped teeth? - ANSWER-Helical gear
What is an idler gear used for? - ANSWER-To change direction of spin
What mechanical device can be used to create oscillating motion? - ANSWER-CAM
Potential energy is - ANSWER-stored energy
Electricity is the flow of what? - ANSWER-electrons
What is the measuring unit name of current? - ANSWER-Ampere
What are the formulas for Ohm's law? - ANSWER-V=IR, I=V/R, R=V/I
A capacitor blocks and passes what? - ANSWER-Blocks DC and passes AC
An electrical magnetic device which pulls in a plunger is called what? - ANSWER-
solenoid
What device converts electrical energy into mechanical energy? - ANSWER-motor
What device converts mechanical energy into electrical energy? - ANSWER-
generator
A __________ converts one type of energy to another. - ANSWER-Transducer
What type of current is commonly applied to a transformer? - ANSWER-AC
