Electrical Engineering mock level 3 part 1

Electrical Engineering mock level 3 part 1

University

21 Qs

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Electrical Engineering mock level 3 part 1

Electrical Engineering mock level 3 part 1

Assessment

Quiz

Science

University

Practice Problem

Medium

Created by

John Shermer

Used 1+ times

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21 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Describe how an electrician, working as a self-employed sole trader, can prove to potential customers a level of competence.

By providing references from previous clients

By showing a portfolio of completed projects

By holding relevant certifications and qualifications

By offering the lowest price for services

2.

MULTIPLE CHOICE QUESTION

5 mins • 3 pts

Calculate the approximate transformer ratio that would step down the maximum super grid voltage to 33 kV.

400:1

500:1

600:1

700:1

3.

OPEN ENDED QUESTION

5 mins • 4 pts

Media Image

Determine, for the circuit shown below, the inductive reactance and impedance.

Evaluate responses using AI:

OFF

4.

MULTIPLE CHOICE QUESTION

5 mins • 5 pts

Media Image

Calculate the phase current (IP) and phase voltage (VP) for the circuit shown below.

I_P = V_P / √3 = 50 / √3 = 8.66 A

V_P = V_L - √3 = 200 V

Answer explanation

To calculate phase current (IP), divide phase voltage (VP) by √3. IP = VP / √3 = 50 / √3 = 8.66 A. Therefore, the correct choice is I_P = V_P / √3 = 50 / √3 = 8.66 A.

5.

MULTIPLE CHOICE QUESTION

3 mins • 3 pts

List three component parts, within a d.c. compound motor, that involve a magnetic process.

Armature, Field Coils, Commutator

Brushes, Bearings, Shaft

Rotor, Stator, Frame

Capacitor, Resistor, Inductor

Answer explanation

The correct choice is Armature, Field Coils, Commutator as these components within a d.c. compound motor involve a magnetic process.

6.

MULTIPLE CHOICE QUESTION

5 mins • 2 pts

Media Image

Calculate, for the luminaire shown below, the illuminance at point B.

E = I / d^2 * cos(θ)

d = √(side A^2 + side B^2)

cos(θ) = side A / d

Answer explanation

The correct formula for illuminance at point B is E = I / d^2 * cos(θ), where I is the intensity, d is the distance, and θ is the angle of incidence.

7.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

State the maximum permitted disconnection times for each of the following circuits:

  • A 230 V, 6 A, lighting circuit on a TN system.
  • A 110 V, 16 A, socket-outlet on a construction site.
  • A 400 V, 45 A, pump on a TT system.

Select the correct set of disconnection times:

1 second, 0.2 seconds, 5 seconds

0.4 seconds, 5 seconds, 1 second

5 seconds, 0.4 seconds, 1 second

0.4 seconds, 0.2 seconds, 5 seconds

Answer explanation

The correct set of disconnection times for the circuits are 0.4 seconds, 0.2 seconds, 5 seconds as per the regulations and safety standards.

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