General G6B: Ferrites, ICs and connectors
These are the 11 official questions in group G6B of the 2023–2027 General question pool, with the correct answer marked and a plain-English explanation of why it's right. The real exam asks one question from this group.
- G6B01Question 1
What determines the performance of a ferrite core at different frequencies?
- AIts conductivity
- BIts thickness
- CThe composition, or “mix,” of materials used Correct
- DThe ratio of outer diameter to inner diameter
Why: A ferrite's frequency performance depends on its material mix.
- G6B02Question 2
What is meant by the term MMIC?
- AMulti-Mode Integrated Circuit
- BMonolithic Microwave Integrated Circuit Correct
- CMetal Monolayer Integrated Circuit
- DMode Modulated Integrated Circuit
Why: MMIC stands for Monolithic Microwave Integrated Circuit.
- G6B03Question 3
Which of the following is an advantage of CMOS integrated circuits compared to TTL integrated circuits?
- ALow power consumption Correct
- BHigh power handling capability
- CBetter suited for RF amplification
- DBetter suited for power supply regulation
Why: CMOS chips use much less power than TTL.
- G6B04Question 4
What is a typical upper frequency limit for low SWR operation of 50-ohm BNC connectors?
- A50 MHz
- B500 MHz
- C4 GHz Correct
- D40 GHz
Why: 50-ohm BNC connectors keep a low SWR up to about 4 GHz.
- G6B05Question 5
What is an advantage of using a ferrite core toroidal inductor?
- ALarge values of inductance may be obtained
- BThe magnetic properties of the core may be optimized for a specific range of frequencies
- CMost of the magnetic field is contained in the core
- DAll these choices are correct Correct
Why: Ferrite toroids give high inductance, contained fields and fewer turns. All the choices are correct.
- G6B06Question 6
What kind of device is an integrated circuit operational amplifier?
- ADigital
- BMMIC
- CProgrammable Logic
- DAnalog Correct
Why: An op-amp is an analog device.
- G6B07Question 7
Which of the following describes a type N connector?
- AA moisture-resistant RF connector useful to 10 GHz Correct
- BA small bayonet connector used for data circuits
- CA low noise figure VHF connector
- DA nickel plated version of the PL-259
Why: Type N is a moisture-resistant RF connector usable to about 10 GHz.
- G6B08Question 8
How is an LED biased when emitting light?
- AIn the tunnel-effect region
- BAt the Zener voltage
- CReverse biased
- DForward biased Correct
Why: An LED lights when it's forward biased.
- G6B10Question 9
How does a ferrite bead or core reduce common-mode RF current on the shield of a coaxial cable?
- ABy creating an impedance in the current’s path Correct
- BIt converts common-mode current to differential mode current
- CBy creating an out-of-phase current to cancel the common-mode current
- DFerrites expel magnetic fields
Why: The ferrite adds impedance in the path of the common-mode current.
- G6B11Question 10
What is an SMA connector?
- AA type-S to type-M adaptor
- BA small threaded connector suitable for signals up to several GHz Correct
- CA connector designed for serial multiple access signals
- DA type of push-on connector intended for high-voltage applications
Why: SMA is a small threaded connector for signals up to several GHz.
- G6B12Question 11
Which of these connector types is commonly used for low frequency or dc signal connections to a transceiver?
- APL-259
- BBNC
- CRCA Phono Correct
- DType N
Why: RCA phono plugs are common for low-frequency and DC connections.