Basic electrical equipment types: ESU practice questions

Supply and distribution equipment, accessories, transformers, inverters and batteries. This topic has 4 of the 30 questions in the ESU.

5 practice questions 0/5 answered

Question 1 of 5In a solar PV or battery storage system, what is the main job of the inverter? ATo step 230 V down to extra-low voltage BTo convert d.c. into a.c. at the supply frequency CTo provide overcurrent protection for the array DTo convert a.c. into d.c. for the consumer unit

Question 2 of 5What does a step-down transformer do? AConverts a.c. into d.c. BReduces a d.c. voltage to a lower d.c. voltage CReduces an a.c. voltage to a lower a.c. voltage DStores energy for use when the mains fails

Question 3 of 5A 110 V site transformer has its output winding centre-tapped to earth. What is the maximum voltage to earth at its output? A25 V B55 V C110 V D230 V

Question 4 of 5What is an RCBO? AA device that reduces the voltage to a circuit BA single device combining an MCB and an RCD CA fuse that can be reset after it operates DA switch that isolates the whole installation

Question 5 of 5What is the main purpose of the cartridge fuse in a standard UK 13 A plug? ATo limit the voltage reaching the appliance BTo detect current leaking to earth CTo protect the user against all electric shock DTo protect the flexible cord against overcurrent

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