MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Microwave Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Equivalent noise temperature associated with an arbitrary white noise source is: |
| A. | N0/GKB |
| B. | N0 |
| C. | N0/ kB |
| D. | None of the mentioned |
| Answer» B. N0 | |
| 2. |
Excess noise ratio is defined as the ratio of generator noise to the noise associated with room temperature |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
The noise power associated with a two port network modeled as thevinin equivalent is: |
| A. | kTB |
| B. | k/TB |
| C. | TB/ K |
| D. | None of the mentioned |
| Answer» B. k/TB | |
| 4. |
The Y factor of an amplifier obtained by measuring the noise figure at the temperatures 77 K and 290 K is 2.7 db. Then the equivalent noise temperature of the amplifier is: |
| A. | 100 K |
| B. | 150 K |
| C. | 170 K |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 5. |
An X- band amplifier has a gain of 20 dB and a gain of 1GHz bandwidth. Noise figure of the amplifier is -62 dBm at 290 K and -64.7 dBm at 77 K. then the Y factor of the amplifier is : |
| A. | 3 dB |
| B. | 6.4 dB |
| C. | 2.7 dB |
| D. | 5.6 dB |
| Answer» D. 5.6 dB | |
| 6. |
Flicker noise occurs in solid-state components and vacuum tubes.a) Trueb) False 4.________ noise is caused by random motion of charges in ionized gas. |
| A. | Trueb) False 4.________ noise is caused by random motion of charges in ionized gas.a) Plasma noise |
| B. | False 4.________ noise is caused by random motion of charges in ionized gas.a) Plasma noiseb) Quantum noise |
| C. | Thermal noise |
| D. | Flicker noiseView Answer |
| Answer» B. False 4.________ noise is caused by random motion of charges in ionized gas.a) Plasma noiseb) Quantum noise | |
| 7. |
EXCESS_NOISE_RATIO_IS_DEFINED_AS_THE_RATIO_OF_GENERATOR_NOISE_TO_THE_NOISE_ASSOCIATED_WITH_ROOM_TEMPERATURE?$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
Equivalent noise temperature associated with an arbitrary white noise source is:$ |
| A. | N<sub>0</sub>/GKB |
| B. | N<sub>0</sub> |
| C. | N<sub>0</sub>/ kB |
| D. | None of the mentioned |
| Answer» B. N<sub>0</sub> | |
| 9. |
The noise power associated with a two port network modeled as thevinin equivalent is? |
| A. | kTB |
| B. | k/TB |
| C. | TB/ K |
| D. | None of the mentioned |
| Answer» B. k/TB | |
| 10. |
An amplifier has a noise equivalent temperature of 170 K. If the amplifier is used with a source having an equivalent noise temperature of TS=450 K, the output noise power of the amplifier is: |
| A. | -50 dBm |
| B. | -60 dBm |
| C. | -60.7 dBm |
| D. | -55 dBm |
| Answer» D. -55 dBm | |
| 11. |
The most insignificant form of noise is: |
| A. | Plasma noise |
| B. | Quantum noise |
| C. | Shot noise |
| D. | Flicker noise |
| Answer» C. Shot noise | |
| 12. |
________ noise is caused by random motion of charges in ionized gas. |
| A. | Plasma noise |
| B. | Quantum noise |
| C. | Thermal noise |
| D. | Flicker noise |
| Answer» B. Quantum noise | |
| 13. |
Flicker noise occurs in solid-state components and vacuum tubes. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
________ noise occurs due to the random fluctuation of charge in an electron tube. |
| A. | Flicker noise |
| B. | Shot noise |
| C. | Thermal noise |
| D. | White noise |
| Answer» C. Thermal noise | |
| 15. |
The type of noise caused by vibration of bound charges is called: |
| A. | Thermal noise |
| B. | Shot noise |
| C. | Flicker noise |
| D. | None of the mentioned |
| Answer» B. Shot noise | |