Electrical Engineering mock level 3 part 1

Quiz
•
Science
•
University
•
Medium
John Shermer
Used 1+ times
FREE Resource
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
Determine, for the circuit shown below, the inductive reactance and impedance.
Evaluate responses using AI:
OFF
4.
MULTIPLE CHOICE QUESTION
5 mins • 5 pts
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
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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