MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If a transmission line of characteristic impedance 50 Ω is terminated with a load impedance of 150 Ω, then VSWR is: |
| A. | 0.75 |
| B. | 0.5 |
| C. | 2 |
| D. | none of the mentioned |
| Answer» C. 2 | |
| 2. |
If the reflection co-efficient for a transmission line is 0.3, then the VSWR is: |
| A. | 0.5384 |
| B. | 1.8571 |
| C. | 0.4567 |
| D. | 3.6732 |
| Answer» C. 0.4567 | |
| 3. |
Expression for VSWR in terms of reflection co-efficient is: |
| A. | (1+│┌│)/(1-│┌│) |
| B. | (1-│┌│)/(1+│┌│) |
| C. | 1/│┌│ |
| D. | 1/1+│┌│ |
| Answer» B. (1-│┌│)/(1+│┌│) | |
| 4. |
If the reflection coefficient for transmission line is 0.24, then the return lossin dB is: |
| A. | 12.39dB |
| B. | 15dB |
| C. | -12.39dB |
| D. | -15.2dB |
| Answer» B. 15dB | |
| 5. |
Return loss for a transmission line in terms of its reflection co efficient is given by: |
| A. | -20logl┌l in dB where ┌ is the reflection coefficient. |
| B. | -10logl┌l in dB where ┌ is the reflection coefficient |
| C. | -10log (1/l┌l) in dB where ┌ is the reflection coefficient |
| D. | -20log (1/l┌l) in dB where ┌ is the reflection coefficient |
| Answer» B. -10logl┌l in dB where ┌ is the reflection coefficient | |
| 6. |
If a transmission line of a characteristics impedance 50 Ω is terminated with a load impedance of 100 Ω, then the reflection co efficient is: |
| A. | 0.3334 |
| B. | 0.6667 |
| C. | 1.6 |
| D. | 1.333 |
| Answer» B. 0.6667 | |
| 7. |
Expression for a voltage reflection co-efficient in terms of load impedance and characteristics impedance is: |
| A. | (ZL– Z0)/(ZL+ Z0) |
| B. | (ZL+ Z0)/(ZL– Z0) |
| C. | ZL. Z0/( ZL+ Z0)( ZL-Z0) |
| D. | (ZL+ Z0)( ZL-Z0)/ ZL. Z0 |
| Answer» B. (ZL+ Z0)/(ZL– Z0) | |
| 8. |
We say a transmission line is matched when: |
| A. | ZL=Z0 |
| B. | ZL=√Z0 |
| C. | ZL=Z0/2 |
| D. | ZL=2Z0 |
| Answer» B. ZL=√Z0 | |
| 9. |
When a lossless line is terminated with an arbitrary load impedance ZL, then it : |
| A. | causes wave reflection on transmission lines |
| B. | transmits the entire supplied power |
| C. | causes loss in transmission line |
| D. | none of the mentioned |
| Answer» B. transmits the entire supplied power | |