MCQOPTIONS
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MCQOPTIONS
This section includes 72 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The channel of a JFET is between the ___________ |
| A. | ate and drain |
| B. | rain and source |
| C. | ate and source |
| D. | nput and output |
| Answer» C. ate and source | |
| 2. |
A JFET is similar in operation to ___________ valve |
| A. | iode |
| B. | entode |
| C. | riode |
| D. | etrode |
| Answer» C. riode | |
| 3. |
In a JFET, when drain voltage is equal to pinch-off voltage, the depletion layers |
| A. | lmost touch each other |
| B. | ave large gap |
| C. | ave moderate gap |
| D. | one of the above |
| Answer» B. ave large gap | |
| 4. |
The gate of a JFET is ___________ biased |
| A. | everse |
| B. | orward |
| C. | everse as well as forward |
| D. | one of the above |
| Answer» B. orward | |
| 5. |
A certain D-MOSFET is biased at VGS = 0 V. Its data sheet specifies IDSS = 20mA and VGS(off) = -5 V. The value of the drain current is ___________ |
| A. | 0 mA |
| B. | mA |
| C. | 0 mA |
| D. | 0 mA |
| Answer» B. mA | |
| 6. |
A certain common source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ___________ |
| A. | he voltage gain will increase |
| B. | he transconductance will increase |
| C. | he voltage gain will decrease |
| D. | he Q-point will shift |
| Answer» D. he Q-point will shift | |
| 7. |
The pinch-off voltage of a JFET is about ___________ |
| A. | V |
| B. | .6 V |
| C. | 5 V |
| D. | 5 V |
| Answer» B. .6 V | |
| 8. |
In a p-channel JFET, the charge carriers are ___________ |
| A. | lectrons |
| B. | oles |
| C. | oth electrons and holes |
| D. | one of the above |
| Answer» C. oth electrons and holes | |
| 9. |
The transconductance of a JFET ranges from ___________ |
| A. | 00 to 500 mA/V |
| B. | 00 to 1000 mA/V |
| C. | .5 to 30 mA/V |
| D. | bove 1000 mA/V |
| Answer» D. bove 1000 mA/V | |
| 10. |
A n-channel D-MOSFET with a positive VGS is operating in ___________ |
| A. | he depletion-mode |
| B. | he enhancement-mode |
| C. | ut off |
| D. | aturation |
| Answer» C. ut off | |
| 11. |
When drain voltage equals the pinch-off-voltage, then drain current ___________ with the increase in drain voltage |
| A. | ecreases |
| B. | ncreases |
| C. | emains constant |
| D. | one of the above |
| Answer» D. one of the above | |
| 12. |
For VGS = 0 V, the drain current becomes constant when VDS exceeds |
| A. | ut off |
| B. | DD |
| C. | P |
| D. | V |
| Answer» D. V | |
| 13. |
A MOSFET has ___________ terminals |
| A. | wo |
| B. | ive |
| C. | our |
| D. | hree |
| Answer» E. | |
| 14. |
A common base configuration of a pnp transistor is analogous to ___________ of a JFET |
| A. | ommon source configuration |
| B. | ommon drain configuration |
| C. | ommon gate configuration |
| D. | one of the above |
| Answer» D. one of the above | |
| 15. |
A JFET is also called ___________ transistor |
| A. | nipolar |
| B. | ipolar |
| C. | nijunction |
| D. | one of the above |
| Answer» B. ipolar | |
| 16. |
The source terminal of a JEFT corresponds to ___________ of a vacuum tube |
| A. | late |
| B. | athode |
| C. | rid |
| D. | one of the above |
| Answer» C. rid | |
| 17. |
A JFET has three terminals, namely ___________ |
| A. | athode, anode, grid |
| B. | mitter, base, collector |
| C. | ource, gate, drain |
| D. | one of the above |
| Answer» D. one of the above | |
| 18. |
A MOSFET uses the electric field of a ___________ to control the channel current |
| A. | apacitor |
| B. | attery |
| C. | enerator |
| D. | one of the above |
| Answer» B. attery | |
| 19. |
In a certain CS JFET amplifier, RD= 1kΩ , RS= 560Ω , VDD=10V and gm= 4500 µS. If the source resistor is completely bypassed, the voltage gain is ___________ |
| A. | 50 |
| B. | 5 |
| C. | 0.52 |
| D. | 0.5 |
| Answer» E. | |
| 20. |
If the cross-sectional area of the channel in n-channel JEFT increases, the drain current ___________ |
| A. | s increased |
| B. | s decreased |
| C. | emains the same |
| D. | one of the above |
| Answer» B. s decreased | |
| 21. |
A MOSFET differs from a JFET mainly because ___________ |
| A. | f power rating |
| B. | he MOSFET has two gates |
| C. | he JFET has a pn junction |
| D. | one of the above |
| Answer» D. one of the above | |
| 22. |
A JFET has high input impedance because ___________ |
| A. | t is made of semiconductor material |
| B. | nput is reverse biased |
| C. | f impurity atoms |
| D. | one of the above |
| Answer» C. f impurity atoms | |
| 23. |
The constant-current region of a JFET lies between |
| A. | ut off and saturation |
| B. | ut off and pinch-off |
| C. | and IDSS |
| D. | inch-off and breakdown |
| Answer» E. | |
| 24. |
The output characteristics of a JFET closely resemble the output characteristics of a ___________ valve |
| A. | entode |
| B. | etrode |
| C. | riode |
| D. | iode |
| Answer» B. etrode | |
| 25. |
A CS JFET amplifier has a load resistance of 10 kΩ , RD= 820° . If gm= 5mS and Vin= 500 mV, the output signal voltage is ___________%! |
| A. | 2.05 V |
| B. | 25 V |
| C. | 0.5 V |
| D. | 1.89 V |
| Answer» E. | |
| 26. |
In a common source JFET amplifier, the output voltage is ___________%! |
| A. | |
| B. | in phase with the input |
| Answer» B. in phase with the input | |
| 27. |
A MOSFET is sometimes called ___________ JFET%! |
| A. | many gate |
| B. | open gate |
| C. | insulated gate |
| D. | shorted gate |
| Answer» D. shorted gate | |
| 28. |
In a JFET, IDSS is known as ___________%! |
| A. | drain to source current |
| B. | drain to source current with gate shorted |
| C. | drain to source current with gate open |
| D. | none of the above |
| Answer» C. drain to source current with gate open | |
| 29. |
The two important advantages of a JFET are ___________%! |
| A. | high input impedance and square-law property |
| B. | inexpensive and high output impedance |
| C. | low input impedance and high output impedance |
| D. | none of the above |
| Answer» B. inexpensive and high output impedance | |
| 30. |
A MOSFET differs from a JFET mainly because ___________%! |
| A. | of power rating |
| B. | the MOSFET has two gates |
| C. | the JFET has a pn junction |
| D. | none of the above |
| Answer» D. none of the above | |
| 31. |
*$_A MOSFET differs from a JFET mainly because ___________? |
| A. | of power rating |
| B. | the MOSFET has two gates |
| C. | the JFET has a pn junction |
| D. | none of the above |
| Answer» D. none of the above | |
| 32. |
*/*_A MOSFET has ___________ terminals? |
| A. | two |
| B. | five |
| C. | four |
| D. | three |
| Answer» E. | |
| 33. |
*/*_A n-channel D-MOSFET with a positive VGS is operating in ___________? |
| A. | the depletion-mode |
| B. | the enhancement-mode |
| C. | cut off |
| D. | saturation |
| Answer» C. cut off | |
| 34. |
*/*_The pinch-off voltage of a JFET is about ___________? |
| A. | 5 V |
| B. | 0.6 V |
| C. | 15 V |
| D. | 25 V |
| Answer» B. 0.6 V | |
| 35. |
*/*_The gate of a JFET is ___________ biased? |
| A. | reverse |
| B. | forward |
| C. | reverse as well as forward |
| D. | none of the above |
| Answer» B. forward | |
| 36. |
*/*_The channel of a JFET is between the ___________? |
| A. | gate and drain |
| B. | drain and source |
| C. | gate and source |
| D. | input and output |
| Answer» C. gate and source | |
| 37. |
*/*_In a certain CS JFET amplifier, RD= 1kΩ , RS= 560Ω , VDD=10V and gm= 4500 µS. If the source resistor is completely bypassed, the voltage gain is ___________? |
| A. | 450 |
| B. | 45 |
| C. | 2.52 |
| D. | 4.5 |
| Answer» E. | |
| 38. |
*/*_The source terminal of a JEFT corresponds to ___________ of a vacuum tube? |
| A. | plate |
| B. | cathode |
| C. | grid |
| D. | none of the above |
| Answer» C. grid | |
| 39. |
*/*_A JFET has high input impedance because ___________? |
| A. | it is made of semiconductor material |
| B. | input is reverse biased |
| C. | of impurity atoms |
| D. | none of the above |
| Answer» C. of impurity atoms | |
| 40. |
%_A JFET has high input impedance because ____________% |
| A. | it is made of semiconductor material |
| B. | input is reverse biased |
| C. | of impurity atoms |
| D. | none of the above |
| Answer» C. of impurity atoms | |
| 41. |
_ A common base configuration of a pnp transistor is analogous to ___________ of a JFET$? |
| A. | common source configuration |
| B. | common drain configuration |
| C. | common gate configuration |
| D. | none of the above |
| Answer» D. none of the above | |
| 42. |
_ When drain voltage equals the pinch-off-voltage, then drain current ___________ with the increase in drain voltage$? |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | none of the above |
| Answer» D. none of the above | |
| 43. |
_ In a p-channel JFET, the charge carriers are ___________$? |
| A. | electrons |
| B. | holes |
| C. | both electrons and holes |
| D. | none of the above |
| Answer» C. both electrons and holes | |
| 44. |
_ A certain D-MOSFET is biased at VGS = 0 V. Its data sheet specifies IDSS = 20mA and VGS(off) = -5 V. The value of the drain current is ___________$? |
| A. | 20 mA |
| B. | 0 mA |
| C. | 40 mA |
| D. | 10 mA |
| Answer» B. 0 mA | |
| 45. |
_ A JFET is similar in operation to ___________ valve$? |
| A. | diode |
| B. | pentode |
| C. | triode |
| D. | tetrode |
| Answer» C. triode | |
| 46. |
_ In a certain common source D-MOSFET amplifier, Vds =3.2 V r.m. and Vgs = 280 mV r.m.s. The voltage gain is ___________$? |
| A. | 1 |
| B. | 11.4 |
| C. | 8.75 |
| D. | 3.2 |
| Answer» C. 8.75 | |
| 47. |
_ A JFET has three terminals, namely ___________$? |
| A. | cathode, anode, grid |
| B. | emitter, base, collector |
| C. | source, gate, drain |
| D. | none of the above |
| Answer» D. none of the above | |
| 48. |
__The constant-current region of a JFET lies between__ |
| A. | cut off and saturation |
| B. | cut off and pinch-off |
| C. | o and IDSS |
| D. | pinch-off and breakdown |
| Answer» E. | |
| 49. |
A JFET is also called ___________ transistor$? |
| A. | unipolar |
| B. | bipolar |
| C. | unijunction |
| D. | none of the above |
| Answer» B. bipolar | |
| 50. |
For VGS = 0 V, the drain current becomes constant when VDS exceeds$? |
| A. | cut off |
| B. | VDD |
| C. | VP |
| D. | o V |
| Answer» D. o V | |