General Knowledge

Question 1

What is the 2 losses in a transformer

Answer 1

Coppper and core

Question 2

How are the coils in a transformer connected

Answer 2

Magnetically coupled ?

Question 3

What are the to enemies of a transformer

Answer 3

Heat and over voltage

Question 4

What is a transformer

Answer 4

Magnetically coupled ratio device that works off mural induction

Question 5

What determines voltage drop in xfmr

Answer 5

Impedance

Question 6

Impedance must be with In how much percent when banking

Answer 6

10%

Question 7

Two basic types of arrestors

Answer 7

Valve type and expulsion

Question 8

Coils of xfmr

Answer 8

Insulated wire wound around the core
The insulation depends on the voltage used
No electrical connection between the two coils works off mural induction
Bigger wire on secondary side more current less voltage
Smaller wire on primary side more voltage less current

Question 9

2 xfmr taps uses

Answer 9

Correct primary voltage

Control voltage to the costumer

Question 10

What coil is taps on

Answer 10

Primary side

Question 11

How do taps work

Answer 11

Add or remove turns from primary side

Higher tap add turns to coil there for decreasing secondary voltage

Lower taps remove turns from coil and there for increase secondary voltage

Question 12

Split taps

Answer 12

5 total taps 
2 up 
2 down 
5% each way 
2.5% each tap

Question 13

Straight taps

Answer 13

Only taps one way
5 taps total
Start at 100%
4 usable taps 2.5% each tap

Question 14

Purpose of case ground

Answer 14

Prevent xfmr from becoming energized and acts as neutral on single bushing xfmr

Question 15

fuse size on wye hookup

Answer 15

Kva xfmr divided by primary voltage used

Question 16

Fuse size on delta

Answer 16

Cutout with 2 bushings is kva divided primary voltage used multiplied by 1.73 single bushing cutout is kva divided by primary voltage used

Question 17

How to find size of xfmr used when you have known 3 phase load

Answer 17

Take 3 phase load divide it by 57% and get size xfmr needed
Not used for single phase load

Question 18

What must be done before working on capacitor?

Answer 18

Isolate wait 5min then shunt

Question 19

What are the zero value of a sine wave

Answer 19

360 0 and 180

Question 20

Max positive value of a sine wave

Answer 20

90

Question 21

Max negative value of a sine wave

Answer 21

270

Question 22

What are 4 things that affect resistance

Answer 22

Length
Size
Temp
Material

Question 23

Low power factor due to lagging current you would add what ?

Answer 23

Add capicitors

Question 24

Test gloves how often?

Answer 24

Every use

Question 25

Class 0 max use and proof test voltage

Answer 25

Red max use 1000v proof test 5000

Question 26

Class 1 max use and proof test voltage

Answer 26

White max use 7,500 proof test 10,000

Question 27

Class 2 max use and proof test voltage

Answer 27

Yellow max use 17,000 proof test 20,000

Question 28

Class 3 max use and proof test voltage

Answer 28

Green max use 26,500 proof test 30,000

Question 29

Class 4 max use and proof test voltage

Answer 29

Orange max use 36,000 proof test 40,000

Question 30

How often do you electrally test rubber gloves

Answer 30

6 months

Question 31

How often do you test sleeves

Answer 31

Yearly

Question 32

MAD up to 15kv

Answer 32

Phase to Grd 2ft 1 | Phase to phase 2ft 2

Question 33

MAD up to 36kv

Answer 33

Phase to ground 2ft 4 | Phase to phase 2ft 7

Question 34

MAD up to 46kv

Answer 34

Phase to Grd 2ft 7 | Phase to phase 2ft 10

Question 35

MAD up to 121kv

Answer 35

Phase to Grd 3ft 2 | Phase to phase 4ft3

Question 36

Mad up to 145kv

Answer 36

Phase to Grd 3ft 7 | Phase to phase 4ft 11

Question 37

Mad up to 169kv

Answer 37

Phase to Grd 4ft | Phase to phase 5ft 8