PHEP 13 Flashcards
Why are symbols used in circuit diagrams?
because they can be easily and quickly drawn and they can convey a great deal of information
What is a one-line diagram?
A drawing consisting of one line that shows the route of power between 2 places. It does not show the actual number of wires or phases.
What are the 3 types of circuit diagrams?
One-Line, Schematic & Wiring
What does ASA mean & what is the purpose of it?
‘American Standards Association. - setting a standard for the meaning of circuit diagram symbols
What is a major use of the one-line diagram?
To detail the actual operations of the circuit.
What is a schematic diagram?
A circuit diagram that has more detail than a one-line but is made as simple a possible. It does not show any physical location of the symbols that represent the different parts.
Where is schematic diagrams used mostly?
In design work
A wiring diagram shows?
-All wires
-Where they connect -the routing from place to place
All wiring diagrams are wired as if the wireman was ___________.
facing the equipment
In fig 12 all of the following components are shown on the one-line diagram except? A) B) C) D)
ACB with magnetic trip only
In fig. 12 all of the below statements concerning the control circuit are true except? A) B) C) D)
the PB1 & PB2 switches are of the time delay type
In fig. 12, the purpose of device OL in the one line diagram is to provide overload protection for the? A) B) C) D)
Pump motor
In fig. 12 the following contacts of control switch CSB are closed when the remote control switch is in the NST (normal after start) position? A) B) C) D)
CSB 3&4
In fig. 12 all of the below statements concerning the indicating circuit are true EXCEPT? A) B) C) D)
The red lights are connected in series with operating coil M
In fig 13, the air circuit breakers shown in the one-line diagram is provided with? A) B) C) D)
disconnect couplers
In fig. 13 , the component in the closing circuit that, when energized, releases the charged ACB closing spring to close ACB is? A) B) C) D)
Device SRC
In fig. 13 in the normally off or de-energized condition, all contacts in the automatic circuit are? A) B) C) D)
‘Open except CN1 is closed
In fig. 13, the amber light is energized when ever contacts? A) B) C) D)
‘CSA1 and 2 are closed
In fig. 13, the closing of contacts CSA5 and 6 will? A) B) C) D)
‘Energize the anti-pump relay cont. device Y
In fig 14, the function of the 52/x coil in line 2, when energized is to? A) B) C) D)
‘Cause all 52x contacts to change position
In fig. 14, the CS2 contacts 1 and 2 are in the closed position during? A) B) C) D)
‘Start
In fig. 14, when the bench-board control switch CS2 is moved to the stop position, all of the following takes place EXCEPT? A) B) C) D)
‘All 52/b pallet switches will open
In fig, 14, after the circuit breaker has been tripped by any of the protective devices, it cannot be re-closed until the? A) B) C) D)
‘Tripping relay 86 has been reset
In fig 14 all of the below statements refer to special features of the control circuit for device CS2 and are true except?
The protective devices are unfused only on the positive leg.
