MCQOPTIONS
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MCQOPTIONS
This section includes 261 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Phototransistors usually respond only to light in the red or infrared spectrum. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
DC = IE/IC |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
In saturation, both the base-collector and base-emitter junctions are forward-biased. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
Av RC/r'e |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
Both junctions of a BJT should be forward-biased for linear operation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
PD(max) is usually specified at 25°C. For higher temperatures, the value of PD(max) is greater. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
It is best to check a transistor in-circuit before removing it. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
If maximum IC and maximum VCE are applied to a BJT, maximum power dissipation will not be exceeded. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
BJT transistors are of two general types, npn and pnp. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
DC is the ratio of IC to IE. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
A BJT consists of three regions: base, emitter, and collector. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
What is (are) general-purpose/small-signal transistors case type(s)? |
| A. | TO-18 |
| B. | TO-92 |
| C. | TO-39 |
| D. | TO-52 |
| E. | all of the above |
| Answer» F. | |
| 13. |
What is the ratio of IC to IB? |
| A. | DC |
| B. | hFE |
| C. | DC |
| D. | either DC or hFE, but not DC |
| Answer» E. | |
| 14. |
What is the ratio of IC to IE? |
| A. | DC |
| B. | DC / (DC + 1) |
| C. | DC |
| D. | either DC / (DC + 1) or DC, but not DC |
| Answer» E. | |
| 15. |
In this circuit DC = 100 and VIN = 8 V. The value of RB that will produce saturation is: |
| A. | 92 k |
| B. | 9.1 M |
| C. | 100 k |
| D. | 150 k |
| Answer» B. 9.1 M | |
| 16. |
Refer to this figure. The value of DC = 100 and VIN = 8 V. Determine IC(sat). |
| A. | 18 mA |
| B. | 7.92 mA |
| C. | 1.8 mA |
| D. | 8 A |
| Answer» C. 1.8 mA | |
| 17. |
Refer to this figure. Determine the minimum value of IB that will produce saturation. |
| A. | 0.25 mA |
| B. | 5.325 A |
| C. | 1.065 A |
| D. | 10.425 A |
| Answer» E. | |
| 18. |
Refer to this figure. Determine the minimum value of VIN 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 | |
| 19. |
Refer to this figure. If VCE = 0.2 V, IC(sat) is: |
| A. | 0.05 mA |
| B. | 2.085 mA |
| C. | 1.065 mA |
| D. | 7.4 mA |
| Answer» C. 1.065 mA | |
| 20. |
Refer to this figure. The value of VBC is: |
| A. | 9.2 V |
| B. | 9.9 V |
| C. | –9.9 V |
| D. | –9.2 V |
| Answer» E. | |
| 21. |
Refer to this figure. The value of VCE is: |
| A. | 9.9 V |
| B. | 9.2 V |
| C. | 0.7 V |
| D. | 19.3 V |
| Answer» B. 9.2 V | |
| 22. |
Refer to this figure. The value of VBE is: |
| A. | 0.6 V |
| B. | 0.7 V |
| C. | 1.2 V |
| D. | 0.079 V |
| Answer» C. 1.2 V | |
| 23. |
A 35 mV signal is applied to the base of a properly biased transistor with an r'e = 8 and RC = 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. | |
| 24. |
A BJT has an IB of 50 A and a DC of 75; IC is: |
| A. | 375 mA |
| B. | 37.5 mA |
| C. | 3.75 mA |
| D. | 0.375 mA |
| Answer» D. 0.375 mA | |
| 25. |
A certain transistor has IC = 15 mA and IB = 167 A; DC is: |
| A. | 15 |
| B. | 167 |
| C. | 0.011 |
| D. | 90 |
| Answer» E. | |
| 26. |
Emitter Follower configuration is used for ________. |
| A. | Impedance Matching |
| B. | Voltage Amplification |
| C. | Power Amplification |
| D. | None of the above |
| Answer» B. Voltage Amplification | |
| 27. |
In the active region of a transistor Emitter-Base junction is ______ biased and Collector-Base junction is in _______ biased. |
| A. | forward, forward |
| B. | reverse, reverse |
| C. | forward, reverse |
| D. | reverse, forward |
| Answer» D. reverse, forward | |
| 28. |
Lowest output resistance is obtained in the configuration |
| A. | CE |
| B. | CB |
| C. | CC |
| D. | CC and CE both equally |
| Answer» D. CC and CE both equally | |
| 29. |
A small-signal voltage amplifier in a common emitter configuration was working satisfactorily. Suddenly its emitter-bypass capacitor (CE) got disconnected Its:1. Voltage gain will decrease2. Voltage gain will increase3. Bandwidth will decrease4. Bandwidth will increase |
| A. | 1 and 4 only |
| B. | 2 and 3 only |
| C. | 3 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» B. 2 and 3 only | |
| 30. |
An NPN transistor has a beta cut-off frequency fβ of 1 MHz and Common Emitter short circuit low-frequency current gain β0 of 200 at unity gain frequency fT and the alpha cut-off frequency fo respectively are |
| A. | 200 MHz, 201 MHz |
| B. | 200 MHz, 199 MHz |
| C. | 199 MHz, 200 MHz |
| D. | 201 MHz, 200 MHz |
| Answer» B. 200 MHz, 199 MHz | |
| 31. |
Low-frequency response of RC coupled amplifier can be improved by: |
| A. | Increasing the value of the coupling capacitor only |
| B. | Increasing the values of the bypass capacitor and coupling capacitor |
| C. | Increasing the value of bypass capacitor only |
| D. | Decreasing the value of the coupling capacitor |
| Answer» C. Increasing the value of bypass capacitor only | |
| 32. |
Most of linear ICs are based on the two transistor differential amplifier because of its |
| A. | Input voltage dependent linear transfer characteristic |
| B. | High voltage gain |
| C. | High input resistance |
| D. | High CMRR |
| Answer» E. | |
| 33. |
For amplifier application, a transistor needs to be biased to operate in which of the following regions? |
| A. | Cut-off region |
| B. | Depletion region |
| C. | Active region |
| D. | Saturation region |
| Answer» D. Saturation region | |
| 34. |
A transistor with β = 100 is to be used in the emitter feedback bias configuration. If Re = 2 kΩ, Rb = 370 kΩ the stability factor is |
| A. | 1 |
| B. | 1.57 |
| C. | 65 |
| D. | 32.5 |
| Answer» D. 32.5 | |
| 35. |
All transistor in the N output current mirror in figure given below are matched with a finite gain β and early voltage VA = ∞. The expression for load current is |
| A. | \(\frac{{{I_{ref}}}}{{\left( {1 + \frac{{\left( {1 + N} \right)}}{{\beta \left( {\beta + 1} \right)}}} \right)}}\) |
| B. | \(\frac{{{I_{ref}}}}{{\left( {1 + \frac{N}{{\beta \left( {\beta + 1} \right)}}} \right)}}\) |
| C. | \(\frac{{\beta {I_{ref}}}}{{\left( {1 + \frac{{\left( {1 + N} \right)}}{{\beta \left( {\beta + 1} \right)}}} \right)}}\) |
| D. | \(\frac{{\beta {I_{ref}}}}{{\left( {1 + \frac{N}{{\beta \left( {\beta + 1} \right)}}} \right)}}\) |
| Answer» B. \(\frac{{{I_{ref}}}}{{\left( {1 + \frac{N}{{\beta \left( {\beta + 1} \right)}}} \right)}}\) | |
| 36. |
In the differential amplifier shown in the figure, the magnitudes of the common-made & differential-mode gains are Acm and Ad, respectively. If the resistance RE is increased, then |
| A. | Acm increases |
| B. | Common-mode Rejection Ratio increases |
| C. | Ad increases |
| D. | Common-mode Rejection ratio decreases |
| Answer» C. Ad increases | |
| 37. |
Directions : Each of the next items consists of two statements, one labelled as the `Assertion (A)' and the other as 'Reason (R)' You are to examine these two statements carefully and select the answers to these items using the codes given below :Assertion (A) : The typical common base output characteristics of a bipolar junction transistor remains almost parallel to the voltage axis, but shows very little increase in current with increase in the output voltage.Reason (R) : The short circuit common base current gain (α) of a bipolar transistor increases with increase in the temperature. |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually true but R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 38. |
In a CE amplifier, thermal runaway is unconditionally avoided if |
| A. | \({{\rm{V}}_{{\rm{CE}}}} = \frac{1}{2}{\rm{\;}}{{\rm{V}}_{{\rm{CC}}}}\) |
| B. | \({{\rm{V}}_{{\rm{CE}}}} > \frac{1}{2}{\rm{\;}}{{\rm{V}}_{{\rm{CC}}}}\) |
| C. | \({{\rm{V}}_{{\rm{CE}}}} < \frac{1}{2}{\rm{\;}}{{\rm{V}}_{{\rm{CC}}}}\) |
| D. | \({{\rm{V}}_{{\rm{CE}}}} = \frac{1}{{\sqrt 2 }}{\rm{\;}}{{\rm{V}}_{{\rm{CC}}}}\) |
| Answer» D. \({{\rm{V}}_{{\rm{CE}}}} = \frac{1}{{\sqrt 2 }}{\rm{\;}}{{\rm{V}}_{{\rm{CC}}}}\) | |
| 39. |
A BJT is having a common-emitter current gain of 100. Considering 10 V supply and VBE = 0.7 V, what will be the value of RC and RB to set the quiescent point at IC = 10 mA and VCE = 8 V? |
| A. | RC = 200 Ω, RB = 93 kΩ |
| B. | RC = 2 kΩ, RB = 100 kΩ |
| C. | RB = 83 kΩ, RC = 100 Ω |
| D. | RC = 20 Ω, RB = 93 kΩ |
| Answer» B. RC = 2 kΩ, RB = 100 kΩ | |
| 40. |
In common base configuration, the current amplification factor is: |
| A. | α |
| B. | Δ |
| C. | Γ |
| D. | β |
| Answer» B. Δ | |
| 41. |
Cascading two amplifiers will result in |
| A. | reduction in overall gain and increase in overall bandwidth |
| B. | reduction in overall gain and reduction in overall bandwidth |
| C. | increase in overall gain and increase in overall bandwidth |
| D. | increase in overall gain and reduction in overall bandwidth |
| Answer» E. | |
| 42. |
Effect of cascading several amplifier stages is to |
| A. | reduce the overall gain |
| B. | reduce the overall frequency response |
| C. | increase the overall gain and reduce the frequency response |
| D. | decrease the overall gain and increase the frequency response |
| Answer» D. decrease the overall gain and increase the frequency response | |
| 43. |
Push-pull amplifiers are____________. |
| A. | Class AB amplifiers |
| B. | Class C amplifiers |
| C. | Class B amplifiers |
| D. | Class A amplifier |
| Answer» D. Class A amplifier | |
| 44. |
A cascode Amplifier stage is equivalent to |
| A. | A common emitter stage followed by a common base stage |
| B. | A common base stage followed by an Emitter follower |
| C. | An Emitter follower stage followed by a common base stage |
| D. | A common base stage followed by a common Emitter stage |
| Answer» B. A common base stage followed by an Emitter follower | |
| 45. |
Consider the following statements regarding an N-P-N Bipolar Junction Transistor:1. Emitter diode is forward biased and the collector diode is reverse biased2. Emitter has many free electrons3. Free electrons are injected into the base and pass through the collector4. Depletion layers around junction J1 and J2 of BJT are widened.Which of the above statements are correct? |
| A. | 1, 2 and 4 |
| B. | 1, 3 and 4 |
| C. | 2, 3 and 4 |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 46. |
In a differential amplifier, there are two sets of input signals. In first set, ν1 = +50 μV and ν2 = –50 μV and in second set, ν1 = 1050 μV and ν2 = 950 μV. If the common-mode rejection ratio is 100, the percentage difference in the output voltage for the two sets of input signals will be |
| A. | 10% |
| B. | 15% |
| C. | 20% |
| D. | 25% |
| Answer» B. 15% | |
| 47. |
A Darlington pair consisting of two power transistors has an effective β of 125. If the driver BJT has a β of 20, the β of the main transistor is |
| A. | 5 |
| B. | 25 |
| C. | 6.25 |
| D. | 105 |
| Answer» D. 105 | |
| 48. |
Directions: Each of the next items consists of two statements, one labeled as the `Assertion (A)' and the other as 'Reason (R)' You are to examine these two statements carefully and select the answers to these items using the codes given below :Assertion (A): The bias stability of a self-bias amplifier circuit can be improved by increasing the values of both the base resistor (RB) and the emitter resistor (RE).Reason (R): The base resistor (RB) provides the required voltage to the base terminal and the emitter resistor (RE) provides negative feedback to the amplifier. |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually true but R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» E. | |
| 49. |
Assume that the β of transistor is extremely large and VBE = 0.7 V, IC and VCE in the circuit shown in the figure are |
| A. | IC = 1 mA and Vce = 4.7 V |
| B. | IC = 0.5 mA and Vce = 3.75 V |
| C. | IC = 1 mA and Vce = 2.5 V |
| D. | IC = 0.5 mA and Vce = 3.9 V |
| Answer» D. IC = 0.5 mA and Vce = 3.9 V | |
| 50. |
For a given op-amp, CMRR = 105 and differential gain = 105. What is the common-mode gain for the amplifier? |
| A. | 1010 |
| B. | 2 × 105 |
| C. | 105 |
| D. | 1 |
| Answer» E. | |