The tachometer of a building’s elevator...

Question 1 / 20zUuZOUohSlDDKezqQx8e

Question 1 of 20zUuZOUohSlDDKezqQx8e

The tachometer of a building’s elevator circuit experiences interference caused by the radio system nearby. What is a common potential “fix” for the problem?

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Question 1 of 20

zUuZOUohSlDDKezqQx8e

The tachometer of a building’s elevator circuit experiences interference caused by the radio system nearby. What is a common potential “fix” for the problem?

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🔍 Key Concepts

• Radio Frequency Interference (RFI) and how it couples into control circuits • How small capacitors can be used as bypass or filter components for high-frequency noise • Difference between components that block DC/low frequency vs. those that block high-frequency signals

💭 Think About

• Think about what kind of interference a nearby radio system produces: is it low-frequency or high-frequency? Which components are most effective at shunting that kind of noise away from sensitive circuits? • Compare what a very small capacitor does versus a very large capacitor when placed across motor/tachometer leads. Which one mainly affects high-frequency noise without disturbing normal operation? • Would adding a resistor in series help with high-frequency radio noise on a feedback line, or could it affect the elevator’s control signal instead?

✅ Before You Answer

• Check which option involves a small-value capacitor that would primarily bypass or filter high‑frequency interference rather than change the DC or low‑frequency operation of the tachometer circuit. • Verify which component choice is least likely to disturb the normal tachometer feedback signal but can still drain off radio‑frequency noise to ground or across the leads. • Eliminate options that would significantly change the normal operating characteristics (speed, feedback, or torque) of the elevator motor/tachometer circuit.

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Question 1 of 20

The tachometer of a building’s elevator circuit experiences interference caused by the radio system nearby. What is a common potential “fix” for the problem?

Replace the tachometer of the elevator.

Add a . 01 µF capacitor across the motor/tachometer leads.

Add a 200 µF capacity across the motor/tachometer leads.

Add an isolating resistor in series with the motor leads.

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Question 1 / 20zUuZOUohSlDDKezqQx8e

Question 1 of 20zUuZOUohSlDDKezqQx8e

The tachometer of a building’s elevator circuit experiences interference caused by the radio system nearby. What is a common potential “fix” for the problem?

Back

Question 1 of 20

zUuZOUohSlDDKezqQx8e

The tachometer of a building’s elevator circuit experiences interference caused by the radio system nearby. What is a common potential “fix” for the problem?

No comments yet

Be the first to share your thoughts!

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

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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

Quick actions

— No credit card needed