MCQOPTIONS
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MCQOPTIONS
This section includes 35 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate g and r if y = 4 mS and y = 15S. |
| A. | 4 mS, 66.7 k |
| B. | 4 mS, 15 k |
| C. | 66.7 k |
| D. | , 4 mS |
| E. | None of the above |
| Answer» B. 4 mS, 15 k | |
| 2. |
The voltage gain of a common-source amplifier is found by the product of g and R. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
Referring to this figure, calculate A if y = 20 S. |
| A. | –3.48 |
| B. | –3.56 |
| C. | –3.62 |
| D. | –4.02 |
| Answer» D. –4.02 | |
| 4. |
Referring to this figure, find Z if y = 20 S. |
| A. | 1.85 k |
| B. | 1.92 k |
| C. | 2.05 k |
| D. | 2.15 k |
| Answer» C. 2.05 k | |
| 5. |
The gate-to-source voltage V of a(n) ________ must be larger than the threshold V for the transistor to conduct. |
| A. | JFET |
| B. | D-type MOSFET |
| C. | E-type MOSFET |
| D. | None of the above |
| Answer» D. None of the above | |
| 6. |
Determine the value for R if the ac gain is 8. |
| A. | 1.51 k |
| B. | 1.65 k |
| C. | 1.85 k |
| D. | 2.08 k |
| Answer» C. 1.85 k | |
| 7. |
Referring to this figure, calculate Z for y = 20 S. Assume V = −2.2V. |
| A. | 300.2 |
| B. | 330.4 |
| C. | 340.5 |
| D. | 350.0 |
| Answer» C. 340.5 | |
| 8. |
The transconductance g ________ as the Q-point moves from V to I |
| A. | decreases |
| B. | remains the same |
| C. | increases |
| D. | None of the above |
| Answer» D. None of the above | |
| 9. |
For the fixed-bias configuration, if ________. |
| A. | R |
| B. | R |
| Answer» C. | |
| 10. |
Referring to this figure, obtain g for I = 6 mA. |
| A. | 2.83 mS |
| B. | 3.00 mS |
| C. | 3.25 mS |
| D. | 3.46 mS |
| Answer» E. | |
| 11. |
Referring to this figure, calculate Z for V = –3.2 V. |
| A. | 362.52 |
| B. | 340.5 |
| C. | 420.5 |
| D. | 480.9 |
| Answer» E. | |
| 12. |
Referring to this figure, calculate Z if y = 40 S. |
| A. | 2.92 k |
| B. | 3.20 k |
| C. | 3.25 k |
| D. | 3.75 k |
| Answer» B. 3.20 k | |
| 13. |
In a common-source amplifier, the purpose of the bypass capacitor, C, is to |
| A. | keep the source effectively at ac ground. |
| B. | provide a dc path to ground. |
| C. | provide coupling to the input. |
| D. | provide coupling to the load. |
| Answer» B. provide a dc path to ground. | |
| 14. |
Referring to the figure below, determine the output impedance for V = –3 V at V = 5 V. |
| A. | 100 k |
| B. | 80 k |
| C. | 25 k |
| D. | 5 k |
| Answer» B. 80 k | |
| 15. |
Referring to this figure, calculate Z if r = 19 k. |
| A. | 1.75 k |
| B. | 1.81 k |
| C. | 1.92 k |
| D. | 2.00 k |
| Answer» C. 1.92 k | |
| 16. |
On which of the following parameters does r have no or little impact in a source-follower configuration? |
| A. | Z |
| B. | Z |
| C. | A |
| D. | All of the above |
| Answer» E. | |
| 17. |
If I = I / 2, g = ________ g. |
| A. | 1 |
| B. | 0.707 |
| C. | 0.5 |
| Answer» C. 0.5 | |
| 18. |
The ________ configuration has an input impedance, which is other than R. |
| A. | common-source |
| B. | common-gate |
| C. | common-drain |
| D. | None of the above |
| Answer» C. common-drain | |
| 19. |
What is the typical value for the input impedance Z for JFETs? |
| A. | 100 k |
| B. | 1 M |
| C. | 10 M |
| D. | 1000 M |
| Answer» E. | |
| 20. |
When V = 0.5 V g is ________ the maximum value. |
| A. | one-fourth |
| B. | one-half |
| C. | three-fourths |
| Answer» C. three-fourths | |
| 21. |
Referring to the transfer characteristics shown below, calculate g at V = –1 V. |
| A. | 2 mS |
| B. | 3 mS |
| C. | 4 mS |
| D. | 5 mS |
| Answer» C. 4 mS | |
| 22. |
Referring to this figure, calculate A if r = 19 k. |
| A. | –2.85 |
| B. | –3.26 |
| C. | –2.95 |
| D. | –3.21 |
| Answer» D. –3.21 | |
| 23. |
Referring to this figure, calculate A for y = 58 S. |
| A. | –7.29 |
| B. | –7.50 |
| C. | –8.05 |
| D. | –8.55 |
| Answer» B. –7.50 | |
| 24. |
The efficiency of a class D amplifier is |
| A. | 75%. |
| B. | 85%. |
| C. | 90%. |
| D. | 100%. |
| Answer» E. | |
| 25. |
Use the following equation to calculate g for a JFET having I = 10 mA, V = –5 V, and V = –2.5 V. |
| A. | 2 mS |
| B. | 3 mS |
| C. | 4 mS |
| D. | 5 mS |
| Answer» B. 3 mS | |
| 26. |
For what value of I is g equal to 0.5 g? |
| A. | 0 mA |
| B. | 0.25 I |
| C. | 0.5 I |
| D. | I |
| Answer» C. 0.5 I | |
| 27. |
Referring to the following figure, calculate g for V = –1.25 V. |
| A. | 2 mS |
| B. | 2.5 mS |
| C. | 2.75 mS |
| D. | 3.25 mS |
| Answer» D. 3.25 mS | |
| 28. |
Referring to this figure, calculate the value of R if the ac gain is 10. Assume V = ¼V. |
| A. | 2.2 k |
| B. | 2.42 k |
| C. | 2.62 k |
| D. | 2.82 k |
| Answer» E. | |
| 29. |
g has its maximum value for a JFET at ________. |
| A. | 0.5 |
| B. | 0.3 |
| C. | I |
| Answer» E. | |
| 30. |
r changes from one operation region to another with ________ values typically occurring at ________ levels of V (closer to zero). |
| A. | lower, lower |
| B. | lower, higher |
| C. | higher, lower |
| D. | None of the above |
| Answer» B. lower, higher | |
| 31. |
________ configuration(s) has (have) Z R. |
| A. | Fixed-bias |
| B. | Self-bias |
| C. | Voltage-divider |
| D. | All of the above |
| Answer» E. | |
| 32. |
What is the input resistance (R) of a common-gate amplifier? |
| A. | R |
| B. | 1 / g |
| C. | none of the above |
| Answer» D. | |
| 33. |
Where do you get the level of g and r for an FET transistor? |
| A. | from the dc biasing arrangement |
| B. | from the specification sheet |
| C. | from the characteristics |
| D. | All of the above |
| Answer» E. | |
| 34. |
What is (are) the function(s) of the coupling capacitors C and C in an FET circuit? |
| A. | to create an open circuit for dc analysis |
| B. | to isolate the dc biasing arrangement from the applied signal and load |
| C. | to create a short-circuit equivalent for ac analysis |
| D. | All of the above |
| Answer» E. | |
| 35. |
The steeper the slope of the I versus V curve, the ________ the level of g. |
| A. | less |
| B. | same |
| C. | greater |
| Answer» D. | |