MCQOPTIONS
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MCQOPTIONS
This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Engineering (MCQ) questions & answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which term is regarded as an inductive field as it is predictable from Biot Savart law & considered to be of prime importance at near field or the distance close to current element? |
| A. | 1/ r |
| B. | 1/ r |
| C. | 1/ r |
| D. | 1/ r |
| Answer» B. 1/ r | |
| 2. |
If a half-wave dipole operates at 300 MHz with = 0.5m & D = 1.643, what will be its effective area? |
| A. | 0.032 m |
| B. | 0.047 m |
| C. | 0.65 m |
| D. | 0.99 m |
| Answer» B. 0.047 m | |
| 3. |
What would happen if the rms value of induced emf in loop acquires an angle = 90 ? |
| A. | Wave is incident in direction of plane of the loop with induced maximum voltage |
| B. | Wave is incident normal to plane of the loop with no induced voltage |
| C. | Wave is incident in opposite direction of plane of the loop with minimum voltage |
| D. | None of the above |
| Answer» C. Wave is incident in opposite direction of plane of the loop with minimum voltage | |
| 4. |
If the radius of loop is / 20 in a free space medium,what will be the radiation resistance of 8-turn small circular loop? |
| A. | 0.7883 |
| B. | 50.45 |
| C. | 123.17 |
| D. | 190.01 |
| Answer» D. 190.01 | |
| 5. |
For receiving a particular frequency signal, which tuning component must be used by the loop to form a reso t circuit for tuning to that frequency? |
| A. | Capacitor |
| B. | Inductor |
| C. | Resistor |
| D. | Gyrator |
| Answer» B. Inductor | |
| 6. |
According to the directivity of a small loop, which value of ' ' contributes to achieve the maximum value of radiation intensity (U)? |
| A. | 0 |
| B. | 90 |
| C. | 180 |
| D. | 270 |
| Answer» C. 180 | |
| 7. |
If a linear uniform array consists of 9 isotropic elements separated by /4, what would be the directivity of a broadside array in dB? |
| A. | 6.53 dB |
| B. | 7.99 dB |
| C. | 8.55 dB |
| D. | 9.02 dB |
| Answer» B. 7.99 dB | |
| 8. |
If the length of elements of an array is greater than /2, which will be the operating region of an array? |
| A. | Transmission line region |
| B. | Active region |
| C. | Reflective region |
| D. | All of the above |
| Answer» D. All of the above | |
| 9. |
If the elements of a binomial array are separated by /4, how many shape patterns are generated with no minor lobes? |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» D. 16 | |
| 10. |
By how many times is an input impedance of a folded dipole at reso ce greater than that of an isolated dipole with same length as one of its sides? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 11. |
A rectangular horn antenna operating at 4GHz has the wavelength of 0.075m and gain of about 13dBi. What will be its required capture area? |
| A. | 0.0149 m |
| B. | 0.0475 m |
| C. | 0.5521 m |
| D. | 0.9732 m |
| Answer» B. 0.0475 m | |
| 12. |
What is /are the advantages of using ferrite loops?A. Increase in Magnetic field intensityB. Increase in radiation resistanceC. Decrease in Magnetic field intensityD. Decrease in radiation resistance |
| A. | A & B |
| B. | C & D |
| C. | A & D |
| D. | B & C |
| Answer» B. C & D | |
| 13. |
A dipole carries r.m.s. current of about 300A across the radiation resistance 2 . What would be the power radiated by an antenna? |
| A. | 90 kW |
| B. | 135 kW |
| C. | 180 kW |
| D. | 200 kW |
| Answer» D. 200 kW | |
| 14. |
In the solutions of inhomogeneous vector potential wave equation, which component exists if the source is at origin and the points are removed from the source (J = 0)? |
| A. | Inward |
| B. | Outward |
| C. | Both a and b |
| D. | None of the above |
| Answer» C. Both a and b | |
| 15. |
In solution evaluation process of inhomogeneous vector potential wave equation, if points are completely removed from the source, then by which factor does the time varying field & static solution differ? |
| A. | e |
| B. | e |
| C. | e |
| D. | e |
| Answer» B. e | |
| 16. |
In retarded potentials, what factor of time delay is generally introduced in & equations? |
| A. | R + c |
| B. | R - c |
| C. | R/c |
| D. | R x c |
| Answer» D. R x c | |
| 17. |
Which operations are performed by vector potentials (, ) over the radiated fields( & )? |
| A. | Addition |
| B. | Subtraction |
| C. | Differentiation |
| D. | Integration |
| Answer» D. Integration | |
| 18. |
Which auxiliary functions assist in solving the radiation problem by evaluation of & using sources & ? |
| A. | Scalar potentials |
| B. | Vector potentials |
| C. | Gradient potentials |
| D. | Divergence potentials |
| Answer» C. Gradient potentials | |
| 19. |
If & are active at the same time, which principle theorem is used for field estimation? |
| A. | Reciprocity |
| B. | Superposition |
| C. | Causality |
| D. | Relativity |
| Answer» C. Causality | |
| 20. |
The concept ofmagnetic vector potential finds its major application in deriving expression of magnetic field intensity especially for ______ |
| A. | Real fields |
| B. | Imaginary fields |
| C. | Complex fields |
| D. | None of the above |
| Answer» D. None of the above | |