Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

2365 612 electrical sciences Exam 2025 with Answers., Exams of Electrical and Electronics Engineering

2365 612 electrical sciences Exam 2025 with Answers.

Typology: Exams

2024/2025

Available from 05/12/2025

Martin-Ray-1
Martin-Ray-1 🇺🇸

5

(8)

6.1K documents

1 / 5

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
1 | P a g e
2365 612 electrical sciences Exam 2025
with Answers.
1. Power generated at - Correct Answer ✅✅ >>25kv
2. Power transmitted at - Correct Answer ✅✅ >>Stepped up from 25kv
into 275/400kv and 132kv
3. Power distributed at - Correct Answer ✅✅ >>33/11kV and 230/400v
4. How are transformers kept cool - Correct Answer ✅✅ >>Air, oil or gas
5. MCB type B, C, D - Correct Answer ✅✅ >>BSEN 60898
6. RCD - Correct Answer ✅✅ >>BSEN 61008
7. Power factor - Correct Answer ✅✅ >>The ratio of true power to
apparent power. A better factor means current use age is reduced so a
smaller cable size can be used and lower demand needed
8. Pf - Correct Answer ✅✅ >>True power (kW) % Apparent power (kVA)
9. How to create a leading power factor - Correct Answer ✅✅ >>To
correct a lagging power factor we can use a capacitor (bulk and load
connection) or a synchronous motor
10. Inductance - Correct Answer ✅✅ >>
pf3
pf4
pf5

Partial preview of the text

Download 2365 612 electrical sciences Exam 2025 with Answers. and more Exams Electrical and Electronics Engineering in PDF only on Docsity!

2365 612 electrical sciences Exam 2025

with Answers.

  1. Power generated at - Correct Answer ✅✅ >>25kv
  2. Power transmitted at - Correct Answer ✅✅ >>Stepped up from 25kv into 275/400kv and 132kv
  3. Power distributed at - Correct Answer ✅✅ >>33/11kV and 230/400v
  4. How are transformers kept cool - Correct Answer ✅✅ >>Air, oil or gas
  5. MCB type B, C, D - Correct Answer ✅✅ >>BSEN 60898
  6. RCD - Correct Answer ✅✅ >>BSEN 61008
  7. Power factor - Correct Answer ✅✅ >>The ratio of true power to apparent power. A better factor means current use age is reduced so a smaller cable size can be used and lower demand needed
  8. Pf - Correct Answer ✅✅ >>True power (kW) % Apparent power (kVA)
  9. How to create a leading power factor - Correct Answer ✅✅ >>To correct a lagging power factor we can use a capacitor (bulk and load connection) or a synchronous motor

10.Inductance - Correct Answer ✅✅ >>

 how easily a certain material will induce an electromotive force (emf) within a circuit.  AC makes it flux any times a second so producing inductive reactance

11.Inductive Reactance (Xl) - Correct Answer ✅✅ >>  The opposition to current of AC caused by inductance of a circuit, expressed in ohms. 2pieFL  Pie=3.14 f=frequency l=inductance

12.Impedance z - Correct Answer ✅✅ >>Z = square root of Rsquared + XLsquared

13.Capictors - Correct Answer ✅✅ >>Charge like batteries in AC so produces opposition to current called capacitive reactance (XC)

14.Capacitive reactance XC - Correct Answer ✅✅ >>

 1% 2pieFC  Pie=3.14 F is frequency C is capacitance

15.Total reactance - Correct Answer ✅✅ >>  XL -XC or XC - XL  XC capacitive reactance  XL inductive reactance

16.Impedance (z) - Correct Answer ✅✅ >>  Z= square root of rsquared+xsqaufed  Impedance the opposition to current in AC comprising of resistance, inductive and capacitive reactance.

25.Star connection formula - Correct Answer ✅✅ >>Iline = Iphase Vline = Square root of 3 x Vphase

26.Delta connection formula - Correct Answer ✅✅ >>

 Vline = Vphase  Iline = square root of 3 x Iphase

27.Water heater explained (instantaneous) - Correct Answer ✅✅ >>Pull double pole switch which allows current to flow into little boiler in shower which instantly heats water

28.Immersion heater (stored hot water) - Correct Answer ✅✅ >>Heating element activated and heats water storing it keeping it hot and ready. Fed from own circuit with heat resistant flex and connected into FCU

29.Storage heaters - Correct Answer ✅✅ >>Used over night to gradually release heat through vents

30.MCB tripping types - Correct Answer ✅✅ >>

 Thermal tripping for overload, bi metal strips warmed until current exceeds it and trips.  Magnetic tripping for short circuit which automatically trips when activated.

31.Bi metal strip for mcb materials - Correct Answer ✅✅ >>Brass and steel

32.RCD trips - Correct Answer ✅✅ >>

 For earth trips as rcd monitors line and neutral current for inbalances.  Also has trip test button

33.Impedance (Z) - Correct Answer ✅✅ >>Total opposition (resistance and reactance and impedance) of a circuit to AC current flow, measured in ohms.