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WorksheetsElectrical Engineering Quiz 3
Total questions: 16
Worksheet time: 1hrs 20mins
List three things that need to be checked regarding the materials, given on a material schedule, before they are obtained and installed.
Color, size, and price
Durability, availability, and cost
Quality, compatibility with the project, and environmental impact
Weight, texture, and fire resistance
List three methods of generating electricity using renewable energy.
Solar, Wind, and Hydroelectric
Coal, Natural Gas, and Nuclear
Biomass, Geothermal, and Tidal
Oil, Peat, and Diesel
Explain one reason why AC is used in preference to DC for most electrical distribution in the UK.
AC can be easily converted to different voltages using transformers
DC is more efficient than AC
AC is more expensive than DC
DC is safer to transmit over long distances
List three types of AC motor controller.
Soft start, Rotor resistance, Direct online
Pulse-width modulation, Voltage controller, and Slip ring induction
Direct torque control, Slip ring induction, and Synchronous motors
Frequency converter, Pulse-width modulation, and Brushless DC
Determine the neutral current within a three-phase circuit where the current for each phase is L1 = 80 A, L2 = 60 A and L3 = 40 A.
36 A
40A
42A
38A
Why must electric immersion heaters in hot water cylinders have a thermal cut-out within?
To prevent the water from freezing
To regulate the water temperature for energy efficiency
To prevent the water from overheating and potentially causing damage or injury
To monitor the water level in the cylinder
List three different devices that can provide overcurrent protection.
Fuse, Circuit Breaker, Ground Fault Circuit Interrupter
Resistor, Capacitor, Inductor
Transistor, Diode, Transformer
Voltage Regulator, Amplifier, Oscillator
Explain why an IT earthing arrangement may be selected for an installation.
It provides enhanced safety for people and equipment.
It is the most cost-effective earthing arrangement.
It is the only earthing arrangement allowed by regulations.
Where unexpected disconnection of a circuit could cause danger
Explain why three-phase motor circuits do not usually include a neutral conductor.
Because all three phases are balanced there will be no neutral current and thus a conductor is not required.
Due to the high cost of additional wiring for the neutral conductor.
Neutral conductors are only omitted in single-phase circuits, not three-phase circuits.
It is a common misconception; three-phase motor circuits always include a neutral conductor.
List, in the correct order, the first three tests to be performed during the initial verification of a new radial final circuit in accordance with BS 7671.
Continuity of conductors, insulation resistance, polarity
Insulation resistance, continuity of conductors, polarity
Polarity, insulation resistance, continuity of conductors
Continuity of conductors, polarity, insulation resistance
Which of the following is an example of how the sense of touch could be used during an inspection of a metallic conduit system?
To detect the presence of irregularities or damage on the surface
To measure the temperature of the conduit
To determine the electrical conductivity of the conduit
To identify the color of the conduit
What is verified during the functional test of a passive infrared movement detector controlling a number of outdoor luminaires?
The color temperature of the luminaires
The detection range and responsiveness
The waterproof rating of the detector
The energy consumption of the luminaires
Which of the following is NOT a GS38 requirement for an approved voltage indicator used to safely isolate a circuit prior to fault diagnosis?
Must have a fuse in the probe
Should include a means of testing the operation of the device before and after use
Must be able to operate without a battery
Should have a retractable shroud over the probe tips
State two sources for safety services as given in BS 7671.
Storage batteries
Primary cells
Generators
Separate feeder
State the minimum degree of IP protection for each zone in a location containing a bath.
Zone 2 - IPX4
Zone 1 - IPX4
Zone 0 - IPX7
Explain where, within an installation, surge protective devices may be required.
At the main electrical service entrance
Near sensitive electronic equipment
At branch circuits
All of the above
