Title: Railway electrification system.
Question: What problems did AC distribution cause?

Title: Queen (band).
Question: What was the name of Brian May's signature guitar?

Title: Aspirated consonant.
Question: With what word should you see a candle flicker or feel a puff of air?

Title: Treaty.
Question:
What angel, according to Muslim tradition, ordered Muhammad to order a siege on the Banu Qurayza?