NPTEL Smart Grid: Basics to Advanced Technologies Week 9 Assignment Answers 2024
1. Which one is correct in MPPT mode of a solar cell?
- Voc > Vmp and Imp > Isc
- Voc < Vmp and Imp < Isc
- Voc > Vmp and Imp < Isc
- Voc < Vmp and Imp > Isc
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2. What is the purpose of PLL in solar inverter control?
- Tracking grid voltage magnitude and phase angle
- Tracking grid voltage magnitude
- Tracking grid voltage phase angle
- Tracking grid frequency
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3. DFIG is a ____________ type of machine.
- Squirrel Cage Induction
- Slip Ring Induction
- Both Squirrel Cage and Slip Ring Induction
- None of the above
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4. A private entity has taken a contract from the government to establish a hybrid microgrid that should continuously operate in grid-connected mode. Which of the following configuration of microgrid is economical as well as efficient?
- DC- coupled hybrid microgrid
- AC- coupled hybrid microgrid
- AC-DC coupled hybrid microgrid
- Both DC-coupled hybrid microgrid and AC-DC coupled hybrid microgrid
Answer :-
5. Select the correct statement
- Internal resistance is a temporary reason for cell imbalances
- Cell-to-cell is a passive method of cell balancing
- A shunt resistor is an active method of cell balancing
- All are incorrect
Answer :-
6. Which of the following is not an EV charging standard?
- ISO 15118-1/2/3
- ISO 11898-2
- IEC 62840
- None of the above
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7. IEC 62840 standard type is related to ____________
- EV interface
- Communication
- Conductive charging
- Battery swapping
Answer :-
8. The terminal voltage of a battery decreases with ___________ while being charged.
- Increasing charging rate
- Increasing state of charge
- Increasing temperature
- All of the above
Answer :-
9. The interlinking converter works on the principle of _______________
- Equalizing DC side p.u. voltage with AC side p.u. frequency.
- Equalizing DC side p.u. voltage with AC side p.u. voltage.
- Equalizing DC side p.u. voltage angle with AC side p.u. voltage angle.
- None of the above
Answer :-
10. What is/are the reason for cell imbalance?
- Leakage and self-discharge currents
- Internal resistance
- Uneven temperatures
- All of the above
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