CPL CPL High-Security & Specialty Lock Systems

Question 1

What design feature of Medeco locks provides both key control and pick resistance?

Accepted Answer

Angled and rotating pins that require correct key bitting height and rotation

Answer

Medeco cylinders use angled cuts that rotate pins to align a sidebar, requiring both correct height bitting and rotational alignment to open.

Question 2

Mul-T-Lock cylinders achieve high security primarily through which mechanism?

Accepted Answer

A telescoping pin-within-pin system that doubles the number of required alignments

Answer

Mul-T-Lock's telescoping pin system means each pin stack has an inner pin inside the driver pin, requiring two-depth alignment per position.

Question 3

Abloy disc detainer locks are resistant to picking primarily because:

Accepted Answer

They use rotating discs with no springs, eliminating the feedback needed for traditional picking

Answer

Abloy's springless rotating disc design provides no tactile feedback for picking tools, making traditional picking techniques ineffective.

Question 4

What is the defining characteristic of a dimple key lock compared to a standard pin tumbler lock?

Accepted Answer

The key has dimples milled into its flat faces rather than cuts along its edge

Answer

Dimple keys have precisely milled dimples on the flat blade surface, allowing the lock to use more pin positions and be used in either orientation.

Question 5

High-security locks that comply with ANSI/BHMA Grade 1 must withstand a minimum of how many open/close cycles?

Accepted Answer

250,000 cycles

Answer

ANSI/BHMA Grade 1 commercial hardware must withstand a minimum of 250,000 operating cycles to meet durability requirements.

(CPL) Certified Professional Locksmith Practice Test