As shown in the illustration, which of the...

Study

Question 1 of 205eccefa4bacbc34ba4d48382

As shown in the illustration, which of the following would prevent simultaneously pulling in both the forward and reverse contactors (which if allowed to happen would insert a short directly across 4160 VAC line)? See illustration EL-0139.

Back

Question 1 of 20

5eccefa4bacbc34ba4d48382

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

• How a reversing contactor is wired so that the forward (FCR) and reverse (RCR) coils and contacts interlock each other • The role of mechanical interlocks vs electrical interlocks in preventing opposite contactors from closing together • Which devices in the diagram (LVDI, ISHI, RLS, mechanical interlock) affect both forward and reverse circuits at the same time

💭 Think About

• Trace the control circuit for the forward coil (FCR). When FCR is energized, which contacts in the reverse circuit (RCR) are forced open? • Look at what each option actually does in the circuit: does it remove all control power, just open a permissive, or physically block opposite contact closure? • Ask yourself: if one contactor is already closed and you try to energize the other, which feature in the diagram would stop that second contactor from closing and creating a line‑to‑line short?

✅ Before You Answer

• Identify the normally closed contacts labeled with the opposite direction (F in the reverse line and R in the forward line) and understand their function • Confirm which items in the answer choices are interlocks that act between the two contactors, not just safety interlocks that de‑energize the whole circuit • Verify that the chosen feature would still prevent both contactors from being closed even if an operator tried to select the opposite direction while one is already energized

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed