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. |
In the integral cycle control method with duty cycle = k and maximum load current = Im. Find the value of average SCR current. |
| A. | Im/k.π |
| B. | Im |
| C. | k.Im |
| D. | k.Im/π |
| Answer» E. | |
| 2. |
Find the power delivered to the load in the integral cycle control method of ac voltage control, having a sine input of Vs, R load and duty cycle = k. |
| A. | Vs2/R |
| B. | k.Vs2/R |
| C. | √k .Vs2/R |
| D. | 0 |
| Answer» C. √k .Vs2/R | |
| 3. |
If k is the duty cycles of the controller, then the rms value of the output voltage in case of a integral cycle control circuit will be?Consider the input to be sinusoidal with peak value Vm and rms value Vs. |
| A. | Vs x k |
| B. | Vs/k |
| C. | Vs x √k |
| D. | Vs |
| Answer» D. Vs | |
| 4. |
In the integral cycle control of ac voltage controller, is the load is on for n cycles and off for m cycles, then the periodicity is given by? Consider the output is sinusoidal. |
| A. | m/2π(m+n) |
| B. | n/2π(m+n) |
| C. | m/π(m+n) |
| D. | n/π(m+n) |
| Answer» C. m/π(m+n) | |
| 5. |
In the integral cycle control method of ac voltage controller |
| A. | the average power delivered to the load is controlled |
| B. | the instantaneous power delivered to the load is controlled |
| C. | the frequency of output voltage is controlled |
| D. | none of the mentioned |
| Answer» B. the instantaneous power delivered to the load is controlled | |
| 6. |
In the below shown AC converter circuit with firing angle = α for both the devices, T2 will conduct from |
| A. | α to π |
| B. | π + α to 2π |
| C. | π to 2π |
| D. | α to 2π |
| Answer» C. π to 2π | |
| 7. |
The below given output voltage waveform can be obtained by a |
| A. | half wave ac voltage controller |
| B. | full wave ac voltage controller |
| C. | half wave controller with firing angle = 0° for T1 |
| D. | full wave controller with firing angle = 0° for both T1 and T2 |
| Answer» B. full wave ac voltage controller | |
| 8. |
The SCR T1 is fired at an angle of α, and the supply Vs = Vm sinωt. Find the average value of the output voltage. |
| A. | (Vm/2π) (cosα + ) |
| B. | (Vm/2π) (cosα) |
| C. | (Vm/2π) (cosα – 1) |
| D. | Vm |
| Answer» D. Vm | |
| 9. |
In the below shown circuit, the diode conducts for |
| A. | 90° |
| B. | > 90° |
| C. | < 90° |
| D. | 0° |
| Answer» B. > 90° | |