MCQOPTIONS
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MCQOPTIONS
This section includes 58 Mcqs, each offering curated multiple-choice questions to sharpen your Electromagnetic Theory knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
In a waveguide, attenuation near the cut-off frequency is |
| A. | low |
| B. | high |
| C. | very high |
| D. | zero |
| Answer» E. | |
| 52. |
Consider a standard rectangular and a circular waveguide having same dominant mode cut-off frequency, determine the ratio of area of circular waveguide to rectangular waveguide: |
| A. | 1/π |
| B. | 6.78/π |
| C. | 0.69/π |
| D. | π |
| Answer» C. 0.69/π | |
| 53. |
A rectangular waveguide with air medium has dimensions a = 22.86 mm and b = 10.6 mm is fed by 3 GHz carrier from a coaxial cable, which of the following is a false statement for TE01 mode? |
| A. | Propagating mode |
| B. | Non-propagating mode |
| C. | Propagating mode in case filled fully with dielectric material of proper dielectric constant |
| D. | None of the above |
| Answer» B. Non-propagating mode | |
| 54. |
In this mode, the electric field is purely transverse to the direction of propagation, whereas the magnetic field is not. Name the mode of propagation of microwaves. |
| A. | Transverse Electromagnetic Waves |
| B. | Transverse Electric Waves |
| C. | Transverse Magnetic Waves |
| D. | Hybrid Waves |
| Answer» C. Transverse Magnetic Waves | |
| 55. |
An optical fibre cable consists of three parts. One of these is a protective outercoating of the cable. Select that protective outer coating from the given options. |
| A. | Fibre |
| B. | Buffer coating |
| C. | Cladding |
| D. | Core |
| Answer» C. Cladding | |
| 56. |
A typical optical fiber has |
| A. | high refractive index core & low refractive index cladding |
| B. | Low refractive index core & high refractive index cladding |
| C. | Uniform refractive index core surrounded by variable refractive index cladding |
| D. | None of the above |
| Answer» B. Low refractive index core & high refractive index cladding | |
| 57. |
In a single-mode fiber, the power received is 1% that of the transmitted power. The attenuation of a single-mode fiber is of the order of |
| A. | 50 dBm |
| B. | -20 dBm |
| C. | 030 dBm |
| D. | -2 dBm |
| Answer» B. -20 dBm | |
| 58. |
Microwave energies propagate the length of the waveguide by ____ its sidewalls. |
| A. | Moving off |
| B. | Refraction |
| C. | Reflection off |
| D. | None of these |
| Answer» D. None of these | |