MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of these is incorrect for complementary symmetry push-pull amplifiers? |
| A. | During positive cycle NPN transistor conducts |
| B. | It is easier to fabricate on IC |
| C. | Size of the transformer required reduces |
| D. | Efficiency and figure of merit are same as transformer coupled push-pull amplifier |
| Answer» D. Efficiency and figure of merit are same as transformer coupled push-pull amplifier | |
| 2. |
Why does no DC current flow in the primary winding of the output transformer of class B push-pull amplifier? |
| A. | Because DC currents from both transistors flow in opposite directions |
| B. | Because the net impedance is very high to allow flow of current |
| C. | The winding only allows AC current to flow |
| D. | Current only flows in secondary winding due to the presence of load at that side |
| Answer» B. Because the net impedance is very high to allow flow of current | |
| 3. |
What is the disadvantage of a class B push-pull amplifier? |
| A. | The efficiency reduces |
| B. | The figure of merit increases |
| C. | The cross-over distortion occurs |
| D. | The Q-power dissipation is very large |
| Answer» D. The Q-power dissipation is very large | |
| 4. |
When is the maximum efficiency of class B amplifier achieved? |
| A. | When V<sub>MAX</sub> = V<sub>CC</sub> |
| B. | When two transistors are used |
| C. | When V<sub>MIN</sub> = 0 |
| D. | Efficiency is always constant |
| Answer» D. Efficiency is always constant | |
| 5. |
In a class B amplifier, it is found that DC power is 25W, find the ac power. |
| A. | 10 W |
| B. | 62.5 W |
| C. | 25 W |
| D. | 50 W |
| Answer» C. 25 W | |
| 6. |
How do we obtain sinusoidal output out of a class B amplifier? |
| A. | By using non-sinusoidal inputs |
| B. | By utilizing two transistors |
| C. | By biasing it in the active region |
| D. | By adding a capacitor to the output |
| Answer» C. By biasing it in the active region | |
| 7. |
What is the output of a class B amplifier for sinusoidal input? |
| A. | Sinusoidal amplifier |
| B. | Half-sinusoidal |
| C. | Sinusoidal with higher frequency |
| D. | Square wave |
| Answer» C. Sinusoidal with higher frequency | |
| 8. |
Which of these is not true for a class B amplifier? |
| A. | It has zero DC bias |
| B. | They have an efficiency less than that of class A amplifiers |
| C. | The quiescent power dissipation is zero |
| D. | The conduction angle is only 180 |
| Answer» C. The quiescent power dissipation is zero | |