level 3 practice exam questions 1

State the simple steps an electrician will take to estimate the time required for an installation to be completed. 

Answer explanation

1 - Break the job down into various tasks.  

2 - Allot a time to each task.  

3 - Total up the time for the job. 

State three renewable energy sources utilised for producing electricity.

Answer explanation

Solar  

Wind  

Hydro

Describe the function of the capacitor in a capacitor start motor. 

Answer explanation

Capacitor creates a phase shift/displacement 

Creating two phases over the start and run windings  

Inducing an opposing field in the rotor producing torque  

State the type of gas used in the following types of lamps

Answer explanation

a) SON.  

b) Fluorescent. 

a) Sodium  

b) Mercury 

Describe the required relationship between the circuit design current, nominal rating of the overcurrent protective device and the current rating of circuit live conductors. 

Answer explanation

Iz>In ≥ Ib candidate who apply this formula will have an understanding of co-ordination. 

OR  

The use of a description such asCorrect coordination between the cable rating being greater than (1) the protective device rating which must be greater or equal to (1) the design current.(1) (similar wording acceptable).