Quiz: BNC Crimp Connector Assembly — 14 questions

1. Which cable is specified for the Telegärtner straight crimp/crimp G1 BNC male connector?

A. RG-58C/U with a 4.95 mm outer diameter and 50 Ω impedance

B. RG-174 with a 2.8 mm outer diameter and 50 Ω impedance

C. RG-213 with a 10.3 mm outer diameter and 50 Ω impedance

D. RG-59 with a 6.15 mm outer diameter and 75 Ω impedance

Answer: (A)

Explanation

The connector is designed for RG-58C/U cable measuring 4.95 mm in diameter and having a characteristic impedance of 50 Ω. Compatibility with cables outside this specified group is not confirmed.

2. What are the three components of the crimp/crimp BNC male connector?

A. A BNC female body, a solder pin, and a threaded sleeve

B. A BNC female body, a crimp centre pin, and a compression nut

C. A BNC male body, a threaded centre pin, and a solder cup

D. A BNC male body, a crimp centre pin, and a crimp ferrule

Answer: (D)

Explanation

The connector consists of a BNC male body, a crimp centre pin, and a separate crimp ferrule. The ferrule is the component associated with crimping the braid.

3. What distinguishes crimp/crimp termination from a soldered coaxial termination?

A. Both the centre pin and braid ferrule are crimped without soldering

B. Only the centre pin is crimped and the braid is left unsecured

C. The braid is soldered while the centre pin is secured by threads

D. The centre pin is soldered while the braid ferrule is crimped

Answer: (A)

Explanation

In a crimp/crimp termination, both the centre pin and the braid ferrule are crimped, and no soldering is used.

4. Which cable combination matches the specified compatibility group for the connector?

A. RG-59, YR23092, LMR-400, and RG-213

B. RG-58C/U, YR23092, LMR-195, and RG-58

C. RG-174, RG-6, LMR-195, and RG-213

D. RG-58C/U, RG-62, LMR-600, and RG-59

Answer: (B)

Explanation

The compatibility group includes RG-58C/U, YR23092, LMR-195, and RG-58. RG-58C/U specifically has the stated 4.95 mm outer diameter and 50 Ω impedance.

5. Which die configuration is required for crimping this connector?

A. A round die with reference 100025879 and cavities of 1.72 mm and 5.41 mm

B. An XM-type die with reference 100026879 and cavities of 1.50 mm and 4.95 mm

C. An XM-type die with reference 100025879 and HEX cavities of 1.72 mm and 5.41 mm

D. An XM-type die with reference 100025879 and HEX cavities of 2.50 mm and 6.35 mm

Answer: (C)

Explanation

Crimping requires the XM-type die identified by reference 100025879, with two HEX cavities measuring 1.72 mm and 5.41 mm.

6. How should the finished termination be inspected electrically?

A. Use a magnifier to verify that the conductor and braid are visibly soldered together

B. Use a multimeter to verify that continuity between the conductor and braid is open

C. Use a multimeter to verify that continuity between the conductor and braid is closed

D. Use a continuity tester to verify that the centre pin is disconnected from the cable conductor

Answer: (B)

Explanation

Inspection uses a magnifier and a multimeter, with the electrical check confirming that the conductor and braid have no continuity between them. An open reading indicates they are not shorted.

7. What is the total strip length measured from the jacket end to the conductor tip?

A. 5 mm

B. 10 mm

C. 18 mm

D. 7 mm

Answer: (C)

Explanation

The total strip length, measured from the jacket end to the conductor tip, is 18 mm. The 10 mm value refers specifically to the dielectric length.

8. A technician has exposed the dielectric from the conductor tip. What length should this dielectric section have?

A. 10 mm

B. 5 mm

C. 18 mm

D. 7 mm

Answer: (A)

Explanation

The dielectric length measured from the conductor tip is 10 mm. It should not be confused with the 5 mm centre-conductor exposure or the 18 mm total strip length.

9. Why must the specified cable-strip dimensions be followed precisely rather than estimated?

A. They ensure that the cable jacket becomes electrically conductive

B. They eliminate the need to inspect continuity after crimping

C. They determine the connector’s colour and marking

D. They control the 50 Ω impedance match and return loss

Answer: (D)

Explanation

The specified strip lengths govern the 50 Ω impedance match and return loss, so approximating them can impair the electrical performance of the termination.

10. For the specified cable preparation, how far should the centre conductor extend beyond the dielectric?

A. 10 mm

B. 5 mm

C. 7 mm

D. 3 mm

Answer: (B)

Explanation

The centre conductor must be exposed over a length of 5 mm. The 7 mm value applies only to removing the outer foil from double-foil cables, not to the centre-conductor exposure.

11. Which sequence correctly describes the assembly of the connector?

A. Fold back the braid, strip the jacket, slide on the ferrule, insert the assembly into the body, strip the dielectric, and crimp the centre pin before crimping the ferrule

B. Strip the jacket, crimp the ferrule, fold back the braid, strip the dielectric, crimp the centre pin, and insert the assembly into the body

C. Slide on the ferrule, strip the jacket, fold back the braid, strip the dielectric, crimp the centre pin, insert the assembly into the body, and crimp the ferrule

D. Slide on the ferrule, strip the dielectric, strip the jacket, crimp the centre pin, fold back the braid, insert the assembly into the body, and crimp the ferrule

Answer: (C)

Explanation

The ferrule must be slid onto the cable first, followed by jacket and dielectric preparation, centre-pin crimping, body insertion, and final ferrule crimping. Installing the ferrule after preparation is not possible if it was forgotten.

12. After crimping, which condition confirms that the conductor and braid were prepared correctly?

A. The conductor is flush with the centre-pin tip and one braid strand remains outside the ferrule

B. The conductor is flush with the centre-pin tip and no braid strand protrudes after ferrule crimping

C. The conductor extends beyond the centre-pin tip and the braid is folded loosely around the body

D. The conductor is recessed from the centre-pin tip and several braid strands extend beyond the ferrule

Answer: (B)

Explanation

Correct preparation leaves the centre conductor flush with the centre-pin tip and fully contains the braid after ferrule crimping. A recessed conductor or protruding braid indicates an assembly defect.

13. Why must braid strands be kept from touching the centre conductor?

A. Contact would produce intermittent ground contact and occasional false hits

B. Contact would create a short circuit that completely corrupts the Acoustic Emission signal

C. Contact would make the cable length too short for reproducible testing

D. Contact would prevent the ferrule from sliding onto the cable

Answer: (B)

Explanation

A braid strand touching the conductor creates a short circuit, which completely corrupts the Acoustic Emission signal. Intermittent ground contact is instead associated with a non-uniform braid crimp.

14. Which set of checks should be completed before commissioning the cable assembly?

A. Verify braid-to-braid continuity, conductor-to-shield continuity, and an unlabelled approximate cable length

B. Verify jacket thickness, connector weight, and the number of braid strands

C. Verify conductor-to-conductor continuity, conductor-to-shield isolation, and the controlled labelled cable length

D. Verify centre-pin diameter, ferrule colour, and the cable’s storage temperature

Answer: (C)

Explanation

Before commissioning, the assembly must be checked for conductor continuity, isolation between conductor and shield, and a controlled, labelled length. These checks support safe and reproducible Acoustic Emission tests.