MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Power Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Let’s say that a transistor is operating at the middle of the load line, then a decrease in the current gain would$# |
| A. | move the Q point up |
| B. | move the Q point down |
| C. | result in to & fro motion of the Q point |
| D. | not change the Q point |
| Answer» C. result in to & fro motion of the Q point | |
| 2. |
Which of the following relations is true for a BJT? |
| A. | Ic ≈ Ie |
| B. | Ib ≈ Ic |
| C. | Ie ≈ Ib |
| D. | Ib ≈ Ie ≈ Ic |
| Answer» B. Ib ‚Äö√Ñ√∂‚àö¬¢‚àö‚Ć Ic | |
| 3. |
A 1mv of i/p gives an output of 1V, the voltage gain as such would be |
| A. | 0.001 |
| B. | 0.0001 |
| C. | 1000 |
| D. | 100 |
| Answer» D. 100 | |
| 4. |
For a power transistor, the average power loss during the delay time can be given by the equation |
| A. | Ic * Vc |
| B. | 1/T * ‚à´<sup>Td</sup> (Ic Vce) dt |
| C. | Ic * dVc/dt * T |
| D. | 1/T * ‚à´<sup>(Td *Tr)</sup> (Ic Vc) dt |
| Answer» C. Ic * dVc/dt * T | |
| 5. |
The instantaneous power loss during the delay time of a transistor is given by |
| A. | Ic Vce |
| B. | Ib Vbe |
| C. | Ic Vbe |
| D. | Ib Vce |
| Answer» B. Ib Vbe | |
| 6. |
High frequency operation of any device is limited by the |
| A. | forward voltage rating |
| B. | switching losses |
| C. | thermal conductivity |
| D. | heat Sink arrangements |
| Answer» C. thermal conductivity | |
| 7. |
For a power transistor, which of the following relations is true? |
| A. | Ie>Ic>Ib |
| B. | Ib>Ic>Ie |
| C. | Ic>Ie>Ib |
| D. | Ie=Ib |
| Answer» B. Ib>Ic>Ie | |
| 8. |
The power electronics devices have a very high efficiency because |
| A. | cooling is very efficient |
| B. | the devices traverse active region at high speed & stays at the two states, on and off |
| C. | the devices never operate in active region |
| D. | the devices always operate in the active region |
| Answer» C. the devices never operate in active region | |
| 9. |
For a power transistor, if the forward current gain α = 0.97, then β = ? |
| A. | 0.03 |
| B. | 2.03 |
| C. | 49.24 |
| D. | 32.33 |
| Answer» E. | |