MCQOPTIONS
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MCQOPTIONS
This section includes 10 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 MPM, the square wave is the ________ signal whereas the triangular wave is the ________ signal. |
| A. | reference, carrier |
| B. | base, reference |
| C. | carrier, reference |
| D. | none of the mentioned |
| Answer» B. base, reference | |
| 2. |
In the MPM method, the comparator is given _______ and _______ types of waveform at its input. |
| A. | square, sine |
| B. | square, quasi-square |
| C. | sine, triangular |
| D. | square, triangular |
| Answer» E. | |
| 3. |
Find the peak value of the fundamental component of voltage with MPM with two pulses having pulse width = 36° and ɣ = 54°. The Fourier representation of the waveform is as follows. |
| A. | 0.7484 x Vs |
| B. | 1.414 x Vs |
| C. | 0.637 x Vs |
| D. | 2.54 x Vs |
| Answer» D. 2.54 x Vs | |
| 4. |
In case of MPM with two pulses per half cycle of width = d each and ɣ as the distance between the first pulse and ωt=0, for eliminating the nth harmonic from the output voltage, the value of gamma (ɣ) must be equal to |
| A. | 0 |
| B. | π |
| C. | π/n |
| D. | d/n |
| Answer» D. d/n | |
| 5. |
In case of MPM with two pulses per half cycle of width = d each and ɣ as the distance between the first pulse and ωt=0, for eliminating the nth harmonic from the output voltage, which of the following condition must be satisfied? |
| A. | d = 2π |
| B. | d = π |
| C. | d = n° |
| D. | d = 2π/n |
| Answer» E. | |
| 6. |
The amplitude of the nth harmonic of the two-pulse MPM waveform is given by __________Let d be the width of a single pulse and ɣ be the distance from 0 to the centre of the first pulse. |
| A. | (8Vs/nπ) sin(nɣ) sin(nd/2) |
| B. | (4Vs/nπ) sin(nɣ) sin(nd/2) |
| C. | (8Vs/nπ) sin(nπ) sin(nd/2) |
| D. | (8Vs/nπ) sin(nɣ/2) sin(nd/2) |
| Answer» B. (4Vs/nπ) sin(nɣ) sin(nd/2) | |
| 7. |
In the multiple-pulse width modulation method with two pulses per half cycle of width = d each and ɣ as the distance between the first pulse and ωt=0, has the Fourier coefficient bn = |
| A. | (8Vs/π) [ cos(ɣπ/2) cos(nd/2) ]. |
| B. | 0 |
| C. | (4Vs/nπ) [sin(nɣ) sin(nd/2)]. |
| D. | (8Vs/nπ) [sin(nɣ) sin(nd/2)]. |
| Answer» E. | |
| 8. |
In the multiple-pulse width modulation method, the Fourier coefficient an is |
| A. | (Vs/π) [ cos(nπ/2) cos(nd) ]. |
| B. | 0 |
| C. | (4Vs/nπ) [sin(nπ/2) sin(nd)].d) (2Vs/nπ) [sin(nπ/2) sin(n |
| D. | ].b) 0c) (4Vs/nπ) [sin(nπ/2) sin(nd)].d) (2Vs/nπ) [sin(nπ/2) sin(nd)]. |
| Answer» C. (4Vs/nπ) [sin(nπ/2) sin(nd)].d) (2Vs/nπ) [sin(nπ/2) sin(n | |
| 9. |
Several equidistant pulses per half cycle are used in ___________ type of modulation technique. |
| A. | single-pulse |
| B. | multiple-pulse |
| C. | sine-pulse |
| D. | equidistant-pulse |
| Answer» C. sine-pulse | |
| 10. |
In case of a single-pulse width modulation with the pulse width = 2d, to eliminate the 5th harmonic from the output voltage waveform, the value of the pulse width (2d) must be equal to |
| A. | 72° |
| B. | 86° |
| C. | 91° |
| D. | must be equal toa) 72°b) 86°c) 91°d) 5° |
| Answer» D. must be equal toa) 72°b) 86°c) 91°d) 5° | |