PHEP 13

Question 1

Why are symbols used in circuit diagrams?

Answer 1

because they can be easily and quickly drawn and they can convey a great deal of information

Question 2

What is a one-line diagram?

Answer 2

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.

Question 3

What are the 3 types of circuit diagrams?

Answer 3

One-Line, Schematic & Wiring

Question 4

What does ASA mean & what is the purpose of it?

Answer 4

‘American Standards Association. - setting a standard for the meaning of circuit diagram symbols

Question 5

What is a major use of the one-line diagram?

Answer 5

To detail the actual operations of the circuit.

Question 6

What is a schematic diagram?

Answer 6

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.

Question 7

Where is schematic diagrams used mostly?

Answer 7

In design work

Question 8

A wiring diagram shows?

Answer 8

-All wires
-Where they connect -the routing from place to place

Question 9

All wiring diagrams are wired as if the wireman was ___________.

Answer 9

facing the equipment

Question 10

In fig 12 all of the following components are shown on the one-line diagram except? A) B) C) D)

Answer 10

ACB with magnetic trip only

Question 11

In fig. 12 all of the below statements concerning the control circuit are true except? A) B) C) D)

Answer 11

the PB1 & PB2 switches are of the time delay type

Question 12

In fig. 12, the purpose of device OL in the one line diagram is to provide overload protection for the? A) B) C) D)

Answer 12

Pump motor

Question 13

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)

Answer 13

CSB 3&4

Question 14

In fig. 12 all of the below statements concerning the indicating circuit are true EXCEPT? A) B) C) D)

Answer 14

The red lights are connected in series with operating coil M

Question 15

In fig 13, the air circuit breakers shown in the one-line diagram is provided with? A) B) C) D)

Answer 15

disconnect couplers

Question 16

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)

Answer 16

Device SRC

Question 17

In fig. 13 in the normally off or de-energized condition, all contacts in the automatic circuit are? A) B) C) D)

Answer 17

‘Open except CN1 is closed

Question 18

In fig. 13, the amber light is energized when ever contacts? A) B) C) D)

Answer 18

‘CSA1 and 2 are closed

Question 19

In fig. 13, the closing of contacts CSA5 and 6 will? A) B) C) D)

Answer 19

‘Energize the anti-pump relay cont. device Y

Question 20

In fig 14, the function of the 52/x coil in line 2, when energized is to? A) B) C) D)

Answer 20

‘Cause all 52x contacts to change position

Question 21

In fig. 14, the CS2 contacts 1 and 2 are in the closed position during? A) B) C) D)

Answer 21

‘Start

Question 22

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)

Answer 22

‘All 52/b pallet switches will open

Question 23

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)

Answer 23

‘Tripping relay 86 has been reset

Question 24

In fig 14 all of the below statements refer to special features of the control circuit for device CS2 and are true except?

Answer 24

The protective devices are unfused only on the positive leg.