

MCQOPTIONS
This section includes 40 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
1. |
The stability factor of a collector feedback bias circuit is_______________ that of base resistor bias? |
A. | The same as |
B. | More than |
C. | Less than |
D. | None of the above |
Answer» D. None of the above | |
2. |
The disadvantage of base resistor method of transistor biasing is that it_________________? |
A. | 10 IB |
B. | 3 IB |
C. | 2 IB |
D. | 4 IB |
Answer» B. 3 IB | |
3. |
If the temperature increases, the value of VCE_________________? |
A. | Remains the same |
B. | Is increased |
C. | Is decreased |
D. | None of the above |
Answer» D. None of the above | |
4. |
The purpose of resistance in the emitter circuit of a transistor amplifier is to _________________? |
A. | Limit the maximum emitter current |
B. | Provide base-emitter bias |
C. | Limit the change in emitter current |
D. | None of the above |
Answer» D. None of the above | |
5. |
In a base resistor method, if the value of ß changes by 50, then collector current will change by a factor ___________________? |
A. | 25 |
B. | 50 |
C. | 100 |
D. | 200 |
Answer» C. 100 | |
6. |
If the value of collector current IC increases, then the value of VCE ______________? |
A. | Remains the same |
B. | Decreases |
C. | Increases |
D. | None of the above |
Answer» C. Increases | |
7. |
In the above question (Q38.) , what is the collector voltage ? |
A. | 3 V |
B. | 8 V |
C. | 6 V |
D. | 7 V |
Answer» B. 8 V | |
8. |
The base resistor method is generally used in ________________? |
A. | Amplifier circuits |
B. | Switching circuits |
C. | Rectifier circuits |
D. | None of the above |
Answer» C. Rectifier circuits | |
9. |
When the temperature changes, the operating point is shifted due to _______________? |
A. | Change in ICBO |
B. | Change in VCC |
C. | Change in the values of circuit resistance |
D. | None of the above |
Answer» B. Change in VCC | |
10. |
A silicon transistor is biased with base resistor method. If ß=100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V , what is the value of the base resistor RB ? |
A. | 105 kO |
B. | 530 kO |
C. | 315 kO |
D. | None of the above |
Answer» C. 315 kO | |
11. |
The value of VBE ___________________? |
A. | Depends upon IC to moderate extent |
B. | Is almost independent of IC |
C. | Is strongly dependant on IC |
D. | None of the above |
Answer» C. Is strongly dependant on IC | |
12. |
In a particular biasing circuit, the value of RE is about _________________? |
A. | 10 kO |
B. | 1 MO |
C. | 100 kO |
D. | 800 O |
Answer» E. | |
13. |
The zero signal IC is generally ______________ mA in the initial stages of a transistor amplifier? |
A. | 4 |
B. | 1 |
C. | 3 |
D. | More than 10 |
Answer» C. 3 | |
14. |
Transistor biasing is done to keep _____________in the circuit? |
A. | Proper direct current |
B. | Proper alternating current |
C. | The base current small |
D. | Collector current small |
Answer» B. Proper alternating current | |
15. |
Transistor biasing is generally provided by a_______________? |
A. | Biasing circuit |
B. | Bias battery |
C. | Diode |
D. | None of the above |
Answer» B. Bias battery | |
16. |
For faithful amplification by a transistor circuit, the value of VBE should_____________for a silicon transistor? |
A. | Be zero |
B. | Be 0.01 V |
C. | Not fall below 0.7 V |
D. | Be between 0 V and 0.1 V |
Answer» D. Be between 0 V and 0.1 V | |
17. |
In voltage divider bias, VCC = 25 V; R1 = 10 kO; R2 = 2.2 V ; RC = 3.6 V and RE =1 kO. What is the emitter voltage? |
A. | 7 V |
B. | 3 V |
C. | V |
D. | 8 V |
Answer» E. | |
18. |
In a transistor amplifier circuit VCE = VCB +________________? |
A. | VBE |
B. | 2VBE |
C. | 5 VBE |
D. | None of the above |
Answer» B. 2VBE | |
19. |
Thermal runaway occurs when_________________? |
A. | Collector is reverse biased |
B. | Transistor is not biased |
C. | Emitter is forward biased |
D. | Junction capacitance is high |
Answer» C. Emitter is forward biased | |
20. |
For germanium transistor amplifier, VCE should_______________for faithful amplification? |
A. | Be zero |
B. | Be 0.2 V |
C. | Not fall below 0.7 V |
D. | None of the above |
Answer» D. None of the above | |
21. |
In the design of a biasing circuit, the value of collector load RC is determined by__________________? |
A. | VCE consideration |
B. | VBE consideration |
C. | IB consideration |
D. | None of the above |
Answer» B. VBE consideration | |
22. |
The value of stability factor for a base resistor bias is________________? |
A. | RB (ß+1) |
B. | (ß+1)RC |
C. | (ß+1) |
D. | 1-ß |
Answer» D. 1-ß | |
23. |
In voltage divider bias, operating point is 3 V, 2 mA. If VCC = 9 V, RC = 2.2 kO, what is the value of RE ? |
A. | 2000 O |
B. | 1400 O |
C. | 800 O |
D. | 1600 O |
Answer» D. 1600 O | |
24. |
The disadvantage of voltage divider bias is that it has _________________? |
A. | High stability factor |
B. | Low base current |
C. | Many resistors |
D. | None of the above |
Answer» D. None of the above | |
25. |
For proper amplification by a transistor circuit, the operating point should be located at the_____________ of the d.c. load line? |
A. | The end point |
B. | Middle |
C. | The maximum current point |
D. | None of the above |
Answer» C. The maximum current point | |
26. |
For faithful amplification by a transistor circuit, the value of VCE should______________for silicon transistor? |
A. | Not fall below 1 V |
B. | Be zero |
C. | Be 0.2 V |
D. | None of the above |
Answer» B. Be zero | |
27. |
For good stabilsation in voltage divider bias, the current I1 flowing through R1 and R2 should be equal to or greater than_____________? |
A. | 10 IB |
B. | 3 IB |
C. | 2 IB |
D. | 4 IB |
Answer» B. 3 IB | |
28. |
The operating point is also called the _______________? |
A. | Cut off point |
B. | Quiescent point |
C. | Saturation point |
D. | None of the above |
Answer» C. Saturation point | |
29. |
An ideal value of stability factor is________________? |
A. | 100 |
B. | 200 |
C. | More than 200 |
D. | 1 |
Answer» C. More than 200 | |
30. |
The operating point ________________ on the a.c. load line? |
A. | Also line |
B. | Does not lie |
C. | May or may not lie |
D. | Data insufficient |
Answer» B. Does not lie | |
31. |
For proper operation of the transistor, its collector should have___________________? |
A. | Proper forward bias |
B. | Proper reverse bias |
C. | Very small size |
D. | None of the above |
Answer» C. Very small size | |
32. |
The circuit that provides the best stabilization of operating point is___________________? |
A. | Base resistor bias |
B. | Collector feedback bias |
C. | Potential divider bias |
D. | None of the above |
Answer» D. None of the above | |
33. |
Transistor biasing represents ______________ conditions? |
A. | a.c |
B. | d.c |
C. | both a.c. and d.c |
D. | none of the above |
Answer» C. both a.c. and d.c | |
34. |
If biasing is not done in an amplifier circuit, it results in________________? |
A. | Decrease in the base current |
B. | Unfaithful amplification |
C. | Excessive collector bias |
D. | None of the above |
Answer» C. Excessive collector bias | |
35. |
If the maximum collector current due to signal alone is 3 mA, then zero signal collector current should be at least equal to___________________? |
A. | 6 mA |
B. | mA |
C. | 3 mA |
D. | 1 mA |
Answer» D. 1 mA | |
36. |
The biasing circuit has a stability factor of 50. If due to temperature change, ICBO changes by 1 µA, then IC will change by___________________? |
A. | 100 µA |
B. | 25 µA |
C. | 20 µA |
D. | 50 µA |
Answer» E. | |
37. |
The point of intersection of d.c. and a.c. load lines represents __________________? |
A. | Operating point |
B. | Current gain |
C. | Voltage gain |
D. | None of the above |
Answer» B. Current gain | |
38. |
The leakage current in a silicon transistor is about_____________ the leakage current in a germanium transistor? |
A. | One hundredth |
B. | One tenth |
C. | One thousandth |
D. | One millionth |
Answer» D. One millionth | |
39. |
Operating point represents__________________? |
A. | Values of IC and VCE when signal is applied |
B. | The magnitude of signal |
C. | Zero signal values of IC and VCE |
D. | None of the above |
Answer» D. None of the above | |
40. |
The stabilisation of operating point in potential divider method is provided by_______________? |
A. | RE consideration |
B. | RC consideration |
C. | VCC consideration |
D. | None of the above |
Answer» B. RC consideration | |