Published On: Sun, Aug 4th, 2019

Few Illustrated Questions From Practice With Answers

Author: Radoje Jankovic

Question 1. What is shown in this photo?


Cables layed on the cable trays in the big rotary excavator.

Question 2. What represent this photo?


Secondary side of power transformer connection cables. Used single-core cables for hard operation conditions.

Question 3. What is shown in this figure?


Various types of XLPE cables in one large capacity rotary excavator. Air layed bundles of cables are because the constructions are movable, rotary, up and down during working of the machine.

Question 4. What shows this photo?


This photo shows large cable drum on one excavator with 35 kV cable winded on the drum cca. 1500 m of cable for supplying  the excavator with voltage.

Question 5. What shows this photo?


This photo shoe the preparing electrical insulation on the machine for cutting the insulation for stator and rotor grooves in the AC electric motor. 

Question 6. What is showa thess two figure?


The terminal box of the secondary winding of the power transformer of 10/0,4/0,23 kV in one rotary excavator.

The picture show the practically worked out the connection of secondary side of this transformer, correct formed cables which going to the LV switchgear.  

Question 7. What shows these two photos?


These two photos showing the three-phase power transformer, high and low voltage windings – primary and secondary coils.

These coils are wound in the workshop for servicing and rewinding transformers.

Primary winding of one phase for three-phase power transformer.
Two secondary phase windings for three-phase power transformer.

Question 8.

a) What type of voltmeter is shown in this picture? 
b) Which system uses the movable voltmeter? 
c) What is the purpose of this voltmeter in this case? 
d) Try to draw a connection scheme of the voltmeter with a switch and a direct connection to the three-phase system, as well as the wiring diagram voltmeter across the voltage measuring transformers!

Jankovic borrowed photograph from “AutomatizacionControl Procesos” for educational purposes as a good practical example. 

About the Author

- Radoje - Rade Jankovic Electrician, Electrical Technician, Electrical Engineer, PhD, Ecologist, Environmentalist, Designer, Educator, Investigator... Today PROFESSIONAL TECHNICAL WRITER AND DOCUMENTATOR Massive practical experience in almost all fields of electrical engineering over 40 years. My International education group in Facebook: EEEW - ELECTRICAL & ELECTRONIC EDUCATION WORLD where published more than 8000 small or bigger articles, lessons, technical advice, projects, technical calculations, test questions with and without answers, illustrated test questions with and without answers; all my original works and few thousands of may original photos from practice, drawings, circuit diagrams, environmental lessons and examples from everyday practice etc., etc.

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Few Illustrated Questions From Practice With Answers