Which of the following statements correctly matches the lock type with its switching device?

Which of the following statements correctly matches the lock type with its switching device?

• A. Combination lock — switching device is Bolt
• B. Key-operated lock — switching device is Cylinder
• C. Combination lock — switching device is Combination
• D. Key-operated lock — switching device is Wheel pack

Answer: (C)

The key idea here is what part actually carries the user’s input to configure the lock. For a combination lock, you provide the input by dialing numbers on the dials, and those numbers define how the internal wheels align to allow the bolt to move. In other words, the switching device is the combination itself—the set of numbers or positions on the wheels that the lock uses to change its internal state. So, the statement that a combination lock uses the combination as the switching device is the correct match. The bolt is just the moving part that relieves or blocks the locking, not the input that configures the lock’s internal state. For a key-operated lock, the input is a key, and the switching device is the cylinder (the plug) that interacts with the pins. The wheel pack, while part of some locking mechanisms, is not the switching device for a key-operated lock.

The key idea here is what part actually carries the user’s input to configure the lock. For a combination lock, you provide the input by dialing numbers on the dials, and those numbers define how the internal wheels align to allow the bolt to move. In other words, the switching device is the combination itself—the set of numbers or positions on the wheels that the lock uses to change its internal state.

So, the statement that a combination lock uses the combination as the switching device is the correct match. The bolt is just the moving part that relieves or blocks the locking, not the input that configures the lock’s internal state. For a key-operated lock, the input is a key, and the switching device is the cylinder (the plug) that interacts with the pins. The wheel pack, while part of some locking mechanisms, is not the switching device for a key-operated lock.