what is the unique feature fore fire alarm system by arduino?

In reference to the load, how are MOVS connected to help prevent voltage spikes and surges? Are MOVS connected in parallel or in series with the load?

A.1. Combination misalignment is caused byA. misalignment by both offset and angle.B. both shafts offset vertically.C. both shafts offset horizontally.D. both shafts being located at an angle.A.2. You can usually check for a leak in a vacuum system by looking at or feelingA. for an air flow along the piping.B. at the exhaust of the vacuum pump.C. at the vacuum gauge at the vacuum pump.D. for signs of dirt on the piping.A.3. When you measure the voltage drop across a set of contacts, you'reA. checking the quality of the contact set.B. sensing how much current is flowing in the circuit.C. measuring the equivalent motor resistance.D. checking the incoming voltages.