MCQOPTIONS
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MCQOPTIONS
This section includes 28 Mcqs, each offering curated multiple-choice questions to sharpen your Active Filter Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What are the two types of bipolar junction transistors? |
| A. | npn and pnp |
| B. | pnn and nnp |
| C. | ppn and nnp |
| D. | pts and stp |
| Answer» B. pnn and nnp | |
| 2. |
Refer to this figure. Determine the minimum value of V IN from the following that will saturate this transistor. |
| A. | 13.21 V |
| B. | 12.51 V |
| C. | 0.7 V |
| D. | 9.4 V |
| Answer» B. 12.51 V | |
| 3. |
The dc load line on a family of collector characteristic curves of a transistor shows the |
| A. | saturation region. |
| B. | cutoff region. |
| C. | active region. |
| D. | all of the above |
| Answer» E. | |
| 4. |
What is (are) common fault(s) in a BJT-based circuit? |
| A. | opens or shorts internal to the transistor |
| B. | open bias resistor(s) |
| C. | external opens and shorts on the circuit board |
| D. | all of the above |
| Answer» E. | |
| 5. |
A 35 mV signal is applied to the base of a properly biased transistor with an r' e = 8 and R C = 1 k . The output signal voltage at the collector is: |
| A. | 3.5 V |
| B. | 28.57 V |
| C. | 4.375 mV |
| D. | 4.375 V |
| Answer» E. | |
| 6. |
The magnitude of dark current in a phototransistor usually falls in what range? |
| A. | mA |
| B. | ?A |
| C. | nA |
| D. | pA |
| Answer» D. pA | |
| 7. |
In what range of voltages is the transistor in the linear region of its operation? |
| A. | 0 < V CE |
| B. | 0.7 < V CE < V CE(max) |
| C. | V CE(max) > V CE |
| D. | none of the above |
| Answer» C. V CE(max) > V CE | |
| 8. |
What is the order of doping, from heavily to lightly doped, for each region? |
| A. | base, collector, emitter |
| B. | emitter, collector, base |
| C. | emitter, base, collector |
| D. | collector, emitter, base |
| Answer» C. emitter, base, collector | |
| 9. |
Which of the following is true for an npn or pnp transistor? |
| A. | I E = I B + I C |
| B. | I B = I C + I E |
| C. | I C = I B + I E |
| D. | none of the above |
| Answer» B. I B = I C + I E | |
| 10. |
Refer to this figure. The value of DC = 100 and V IN = 8 V. Determine I C(sat) . |
| A. | 18 mA |
| B. | 7.92 mA |
| C. | 1.8 mA |
| D. | 8 A |
| Answer» C. 1.8 mA | |
| 11. |
What is the ratio of I C to I E ? |
| A. | DC |
| B. | DC / ( DC + 1) |
| C. | DC |
| D. | either DC / ( DC + 1) or DC , but not DC |
| Answer» E. | |
| 12. |
A transistor data sheet usually identifies DC as |
| A. | h re . |
| B. | h FE . |
| C. | I C . |
| D. | V CE . |
| Answer» C. I C . | |
| 13. |
The value of DC |
| A. | is fixed for any particular transistor. |
| B. | varies with temperature. |
| C. | varies with I C . |
| D. | varies with temperature and I C . |
| Answer» E. | |
| 14. |
In this circuit DC = 100 and V IN = 8 V. The value of R B that will produce saturation is: |
| A. | 92 k |
| B. | 9.1 M |
| C. | 100 k |
| D. | 150 k |
| Answer» B. 9.1 M | |
| 15. |
Refer to this figure. The value of V BE is: |
| A. | 0.6 V |
| B. | 0.7 V |
| C. | 1.2 V |
| D. | 0.079 V |
| Answer» C. 1.2 V | |
| 16. |
A BJT has an I B of 50 A and a DC of 75; I C is: |
| A. | 375 mA |
| B. | 37.5 mA |
| C. | 3.75 mA |
| D. | 0.375 mA |
| Answer» D. 0.375 mA | |
| 17. |
What does DC vary with? |
| A. | I C |
| B. | ºC |
| C. | both I C and ºC |
| D. | I C , but not ºC |
| Answer» D. I C , but not ºC | |
| 18. |
Refer to this figure. The value of V CE is: |
| A. | 9.9 V |
| B. | 9.2 V |
| C. | 0.7 V |
| D. | 19.3 V |
| Answer» B. 9.2 V | |
| 19. |
A certain transistor has I C = 15 mA and I B = 167 A; DC is: |
| A. | 15 |
| B. | 167 |
| C. | 0.011 |
| D. | 90 |
| Answer» E. | |
| 20. |
For a silicon transistor, when a base-emitter junction is forward-biased, it has a nominal voltage drop of |
| A. | 0.7 V. |
| B. | 0.3 V. |
| C. | 0.2 V. |
| D. | V CC . |
| Answer» B. 0.3 V. | |
| 21. |
When a transistor is used as a switch, it is stable in which two distinct regions? |
| A. | saturation and active |
| B. | active and cutoff |
| C. | saturation and cutoff |
| D. | none of the above |
| Answer» D. none of the above | |
| 22. |
The term BJT is short for |
| A. | base junction transistor. |
| B. | binary junction transistor. |
| C. | both junction transistor. |
| D. | bipolar junction transistor. |
| Answer» E. | |
| 23. |
Refer to this figure. The value of V BC is: |
| A. | 9.2 V |
| B. | 9.9 V |
| C. | –9.9 V |
| D. | –9.2 V |
| Answer» E. | |
| 24. |
For normal operation of a pnp BJT, the base must be ________ with respect to the emitter and ________ with respect to the collector. |
| A. | positive, negative |
| B. | positive, positive |
| C. | negative, positive |
| D. | negative, negative |
| Answer» D. negative, negative | |
| 25. |
Refer to this figure. If V CE = 0.2 V, I C(sat) is: |
| A. | 0.05 mA |
| B. | 2.085 mA |
| C. | 1.065 mA |
| D. | 7.4 mA |
| Answer» C. 1.065 mA | |
| 26. |
What is the ratio of I C to I B ? |
| A. | DC |
| B. | h FE |
| C. | DC |
| D. | either DC or h FE , but not DC |
| Answer» E. | |
| 27. |
A transistor amplifier has a voltage gain of 100. If the input voltage is 75 mV, the output voltage is: |
| A. | 1.33 V |
| B. | 7.5 V |
| C. | 13.3 V |
| D. | 15 V |
| Answer» C. 13.3 V | |
| 28. |
Refer to this figure. Determine the minimum value of I B that will produce saturation. |
| A. | 0.25 mA |
| B. | 5.325 A |
| C. | 1.065 A |
| D. | 10.425 A |
| Answer» E. | |