level 3 electrical mock paper 2

State three human resource factors that willrequire monitoring during an electrical installation project.(3 marks)

Explain the operating principles of a wind turbine.(3 marks)

A 0.318 H inductor has a resistance of 20 Ω and is connected in series with a capacitor of 38.9 µF. They are connected to an AC 230 V supply at 50 Hz. Calculate the circuit’s power factor. (5 marks)

When a voltage of 110 V is applied to a circuit, a current of 20 A flows at a power factor of 0.95. Calculate the kVA.(2 marks)

An inductor has an inductive reactance of 4 kΩ when it is connected across a 24 V, 50 kHz AC supply. Calculate the supply current.(2 marks)

Explain how the wound rotor on an AC induction motor achieves a high starting torque.(3 marks)

State the three principles of space heating.(3 marks)

Describe the operating principle of a thermostat in an immersion heater.(3 marks)

Determine a suitable type and nominal rating of protective device for a single-phase circuit supplying a total loading of 4000 W discharge lighting. (4 marks)

State the two methods used to determine the suitability of a protective conductor CSA for thermal constraints during earth fault conditions as given in BS 7671. (2 marks