TPC Electrical Level 3 Test: Questions & Solutions

TPC Electrical Level 3 Test: Questions & Solutions
v v v v v v v v




The permanent joining of motor frames, conduit, control boxes, and other meta
v v v v v v v v v v v


l parts not intended to carry current in normal operations is known as
v v v v v v v v v v v v




• equipment bonding
v v


• equipment grounding
v v


• short circuiting
v v


• system grounding Right Ans - equipment bonding
v v vvvvvvv v v v v




Autotransformer starting is used where the minimum motor _____ current must
v v v v v v v v v v v


be reduced with a minimum sacrifice of motor starting torque.
v v v v v v v v v




• full-load
v


• Inrush
v


• locked-rotor
v


• running Right Ans - inrush
v vvvvvvv v v v




The function of a float switch is to indicate
v v v v v v v v




• flow
v


• liquid level
v v


• movement
v


• pressure Right Ans - liquid level
v vvvvvvv v v v v




The minimum potential difference that will cause the armature to seat against t
v v v v v v v v v v v v


he pole faces of a relay coil is called the. _____voltage
v v v v v v v v v v v




• drop-out
v


• pick-up
v


• seal-in
v


• seat-in Right Ans - seal in
v vvvvvvv v v v v




What is a protocol?
v v v




• generic communication methods
v v v


• similar communication methods
v v v


• unique communication methods
v v v

,• polite communication methods
v v v vvvvvvv Right Ans - v v


unique communication methods
v v v




In a pneumatic circuit, leakage of air during the actuating part of the cycle
v v v v v v v v v v v v v




• can usually be ignored
v v v v


• indicates the device will fail soon
v v v v v v


• is dangerous and must be stopped
v v v v v v


• prevents normal operation Right Ans - can usually be ignored
v v v vvvvvvv v v v v v v




A two-parallel-Y connection
v v




• requires a higher potential difference than a series-Y connection
v v v v v v v v v


• requires a lower potential difference than a series-Y connection
v v v v v v v v v


• is the lower-voltage connection in a dual-voltage, delta-connected motor
v v v v v v v v v


• is the higher voltage connection in a dual-voltage, delta-
v v v v v v v v v


connected motor Right Ans - v vvvvvvv v v


requires a lower potential difference than a series-Y connection
v v v v v v v v v




Another name for the mounting enclosure is what?
v v v v v v v




• fixed
v


• modular
v


• rасk
v


• slots Right Ans - rack
v vvvvvvv v v v




An undercurrent relay functions when the current reaches a(n)
v v v v v v v v




• lower limit
v v


• upper limit
v v


• value between the upper and lower limits
v v v v v v v


• value outside the upper and lower limits Right Ans - lower limit
v v v v v v v vvvvvvv v v v v




The first step in developing a PLC system to meet given specifications is
v v v v v v v v v v v v




• assembling the documentation
v v v


• drawing the hardware
v v v


• sizing the system
v v v


• writing the software Right Ans - sizing the system
v v v vvvvvvv v v v v v

, A relay that has "dogs" located directly above the operating bar is called a ____ r
v v v v v v v v v v v v v v v


elay

• frame
v


• latching
v


• power
v


• reed Right Ans - latching
v vvvvvvv v v v




Most reversing starters with low-
v v v v


voltage remote pushbuttons are all of the following EXCEPT
v v v v v v v v




• electrically interconnected
v v


• electrically interlocked
v v


• mechanically interconnected
v v


• mechanically interlocked Right Ans - mechanically interconnected
v v vvvvvvv v v v v




Which of the following is usually associated with a PLC counter instruction?
v v v v v v v v v v v




• preset register
v v


• time base
v v


• preset time
v v


• accumulated time
v v vvvvvvv Right Ans - preset register
v v v v




Which of the following is the most common cause of a program problem?
v v v v v v v v v v v v




• Changes made to the original program
v v v v v v


• Power outage
v v


• Sensor replacement
v v


• Virus Right Ans - Changes made to the original program
v vvvvvvv v v v v v v v v




Conductors that supply two or more motors must be able to carry at least
v v v v v v v v v v v v v


________ % of the full-load current rating of the largest motor.
v v v v v v v v v v v




• 75v


• 100
v


• 125
v


• 150
v vvvvvvv Right Ans - 125 v v v