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RF and Microwave Engineering MCQs

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1. Which of the following frequency ranges is typically considered as RF?





2. The wavelength of a 1 GHz signal in free space is approximately:





3. The term ‘microwave’ generally refers to frequencies above:





4. What does ‘RF’ stand for?





5. A quarter-wave impedance transformer has an impedance transformation ratio of:





6. Which of the following components is typically used to filter RF signals?





7. In waveguides, TE modes refer to:





8. The resonant frequency of a parallel LC circuit depends on:





9. The characteristic impedance of a transmission line depends on:





10. A circulator is a microwave device that:





11. The primary advantage of using a microstrip line over a stripline is:





12. The Smith chart is used primarily for:





13. The purpose of a directional coupler in RF systems is to:





14. Which of the following antennas is often used for microwave communication?





15. A Gunn diode is commonly used in microwave oscillators because:





16. In microwave engineering, the term ‘VSWR’ stands for:





17. A radar system typically operates at:





18. The primary function of a waveguide is to:





19. The term ‘dBm’ is a measure of:





20. A coaxial cable consists of:





21. The main advantage of using waveguide over coaxial cable is:





22. The term ‘isotropic radiator’ refers to an antenna that:





23. A Smith chart is used for:





24. In microwave transmission lines, the mode in which the electric field is parallel to the direction of propagation is known as:





25. In a microstrip antenna, the patch is typically made of:





26. The term ‘group delay’ in microwave systems refers to:





27. A horn antenna is known for its:





28. A stub tuner is used primarily for:





29. The purpose of a duplexer in a radar system is to:





30. The main function of a circulator in microwave systems is to:





31. The bandwidth of a resonant circuit is defined as:





32. In waveguide terminology, WR-90 refers to a waveguide with:





33. The term ‘dielectric constant’ in microwave engineering refers to:





34. A ferrite circulator is used primarily because of its:





35. The ‘skin effect’ in conductors refers to:





36. In radar systems, the term ‘Doppler effect’ is used to describe:





37. The term ‘fading’ in microwave communication refers to:





38. In microwave systems, a ‘balun’ is used primarily for:





39. The phenomenon where electromagnetic waves are confined within a specific region of space by reflecting off boundaries is called:





40. The term ‘cut-off frequency’ in waveguides refers to:





41. A dielectric resonator antenna typically consists of:





42. The term ‘Q factor’ in microwave circuits refers to:





43. A ‘magic tee’ is a microwave component used for:





44. A helical antenna is characterized by:





45. The term ‘ferrite’ in microwave engineering refers to a material known for its:





46. In a microwave transistor amplifier, the input and output ports are typically:





47. A ‘s-parameter’ in microwave engineering refers to:





48. The term ‘antenna gain’ is a measure of:





49. The term ‘insertion loss’ in microwave systems refers to:





50. A ‘vector network analyzer’ is used primarily for:





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