Electrical Engineering Quiz

What should be checked regarding the materials given on a material schedule before they are obtained and installed?

• The right type, fit for purpose, in the correct quantity

• The color, size, and manufacturer

• The warranty, brand, and price

• The delivery method, storage conditions, and maintenance requirements

Which of the following is not a method of generating electricity using renewable energy?

• Solar

• Nuclear

• Wind

• Tidal

What is one reason why AC is used in preference to DC for most electrical distribution in the UK?

• AC voltage can easily be stepped up and down using transformers

• AC is more dangerous than DC, which makes it more efficient

• DC can easily be converted to AC, but not vice versa

• AC is cheaper to produce than DC

Which of the following is not a type of AC motor controller?

• Direct-on-line

• Star-delta

• Rotor-resistance

• Phase-sequencing

How can the neutral current in a three-phase circuit be determined if the current for each phase is L1 = 80 A, L2 = 60 A, and L3 = 40 A?

• By using Ohm's Law

• By using a scaled triangle

• By measuring with an ammeter

• By calculating the power factor

What is the purpose of a thermal cut-out in electric immersion heaters within hot water cylinders?

• To regulate the temperature of the water

• To prevent the cylinder from overheating and dangerously pressurising if the thermostat fails

• To increase the efficiency of the heating process

• To signal when the water has reached the desired temperature

List three different devices that can provide overcurrent protection.

• Fuse, light bulb, switch

• Fuse, circuit breaker, thermal overload trip

• Resistor, capacitor, inductor

• Transformer, generator, relay

Why might an IT earthing arrangement be selected for an installation?

• To ensure a stable power supply

• To reduce the cost of installation

• Where unexpected disconnection of a circuit could cause danger

• To simplify the design of the electrical system

Why do three-phase motor circuits not usually include a neutral conductor?

• Because it is not necessary for the functioning of the motor

• Because it reduces the risk of electric shocks

• Because all three phases are balanced and there will be no neutral current

• Because it makes the motor run faster

What is the correct order of the first three tests to be performed during the initial verification of a new radial final circuit in accordance with BS 7671?

• Insulation resistance, Continuity, Polarity

• Continuity, Insulation resistance, Polarity

• Polarity, Continuity, Insulation resistance

• Insulation resistance, Polarity, Continuity