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WorksheetsElectrical Installation LEVEL 3 Quiz
Total questions: 18
Worksheet time: 9mins
Which of the following documents should be available to a site electrician during the construction phase of an electrical installation?
Risk assessment Method Statement
Manufacturer’s instructions / Data sheets
Building regulations
All of the above
Which of the following is a type of inductive transformer?
Isolation / separation
Laminated core
Single phase
Direct current transformer
Why is pumped storage electricity generation used in preference to traditional fuel sources?
It is cheaper to operate
It provides supply flexibility when demand fluctuates
It requires less maintenance
It uses solar energy
A single-phase electric motor has a rating of 2.55 kW and the current lags the voltage by 32°. Calculate the apparent power.
2.55 kVA
3 kVA
1.59 kVA
0.85 kVA
Why must all live conductors of the same A.C. circuit enter a steel-cased consumer unit through one single hole?
To reduce the length of the conductors
To ensure the magnetic fields induced by each conductor are offset by the opposing fields
To make the installation process easier
To increase the voltage of the circuit
Which of the following gases or metallic vapours is commonly used in discharge lamps?
Neon
Oxygen
Nitrogen
Carbon Dioxide
Why is star-delta motor control equipment used in preference to direct-on-line?
It reduces the line current during start-up and increases the torque while running
It is cheaper to install
It requires less maintenance
It is more energy-efficient
What is one of the drawbacks of BS 3036 fuses?
They have a high fusing factor
They are very expensive
They can overheat and potentially cause a fire
They are difficult to replace
Which of the following is a factor to be taken into account when calculating the maximum demand of an installation according to BS 7671?
The color of the cables
The location of points of power demand
The brand of the equipment
The type of insulation used
Which of the following factors should be considered when designing a lighting system?
Anticipated future demand
Color of the walls
Number of windows
Type of flooring
What is the purpose of adjusting sensors to test settings in a hotel corridor?
To change the color of the lights
To activate lights when people move in appropriate locations
To increase the brightness of the lights
To turn off the lights during the day
Which of the following is NOT a practical measure to ensure the safety of other people during inspection and testing?
Informing people of dangers
Posting signs for awareness
Ensuring lifts are occupied
Providing adequate lighting for safe access/egress
Why must a newly installed gas central heating boiler be disconnected from a circuit before an insulation resistance test?
To prevent overheating
To avoid false readings and damage to sensitive electronic components
To save energy
To ensure the boiler is working properly
Which of the following hazardous materials may require specialist disposal when undertaking fault rectification work?
Wood
Plastic
Mercury
Paper
Identify three pieces of verbal information an electrician should seek from a user when undertaking diagnosis of an intermittent electrical fault.
How long has the fault been occurring
What is the color of the wires
How often does the fault occur
Is anything else happening at the time the fault occurs
State the upper voltage limits for Extra-Low Voltage.
50 V ac
100 V ac
120 V dc
200 V dc
Explain the effect of running a cable through 200 mm of thermal insulation.
The thermal insulation will increase the ability of the cable to dissipate heat
The thermal insulation will reduce the ability of the cable to dissipate heat
The current carrying capacity of the cable will increase
The correction factor to be applied is 0.75
Explain why Low Voltage circuits with surge protective devices may have the insulation resistance test voltage reduced.
Low voltage circuits are normally tested at 500 V, which is sufficient to operate the surge protection
Low voltage circuits are normally tested at 1000 V, which is sufficient to operate the surge protection
Reducing the test voltage to 250 V will stop the operation of the surge protective device
Reducing the test voltage to 100 V will stop the operation of the surge protective device
