Skip to main content

DC Microgrid MCQ-2


1. The role of ILCs, DGs and SEs respectively in the case of grid connected un-dispatched power mode operation of AC/DC hybrid microgrid is

  •  operates in MPPT, regulate the DC bus, always discharge
  •  Regulates the DC bus, operates in MPPT, always charges
  •  Regulates DC bus, operates in MPPT, charges/discharges
  •  Operates in off MPPT, regulates the DC link voltage, charges/discharges


 2. The modern electronic loads when they are connected to the isolated AC microgrid having PV as the single source of energy, the following conversion losses are natural

  •  AC-DC-AC
  •  DC-AC-DC
  •  DC-DC-DC
  •  AC-AC-AC


 3. Synchronizing torque comes into operation under all of the following cases except

  •  Frequency difference between two voltages
  •  Phase difference between two voltages
  •  Changing excitation current
  •  None of the above


 4. When Induction motor load is connected to the isolated DC Microgrid having wind as the single source of energy, the following losses take place

  •  AC-DC-AC
  •  DC-AC-DC
  •  DC-DC-DC
  •  AC-AC-AC


 5. The converters used for Battery, PV, ultra capacitor and PMSG wind system in a DC Microgrid respectively are

  •  unidirectional, bidirectional, bidirectional, unidirectional
  •  bidirectional, unidirectional, bidirectional, unidirectional
  •  unidirectional, unidirectional, bidirectional, bidirectional
  •  bidirectional, bidirectional, unidirectional, unidirectional


 6. The frequency of the microgrid system control the

  •  Reactive power
  •  Active power
  •  (a) and (b) both
  •  None of them


 7. The external control of ac output voltage can be achieved in an inverter by

  •  connecting a cyclo-converter
  •  connecting an ac voltage controller between the dc source and inverter
  •  connecting an ac voltage controller between the output of the inverter and the load
  •  connecting an ac voltage controller between the load and the dc source


 8. Demand response is performed at

  •  Only consumer side
  •  Only utility side
  •  Both at utility and consumer sides
  •  None of the above


 9. For a single phase, full bridge, diode rectifier excited from a 230 V, 50 Hz source. With R = 10 Ω & the inductance (L) large enough to maintain continues conduction, the average and RMS values of diode currents will be

  •  7.85 A, 8 A
  •  10.35 A, 7.85 A
  •  10.35 A, 14.6 A
  •  8 A, 8 A


 10. A 3-phase bridge rectifier charges a 240 V battery. The rectifier is given a 3 phase, 230 V supply. The current limiting resistance in series with the battery is of 8 Ω. Find the average value of battery charging current.

  •  8.82 A
  •  6.82 A
  •  7.82 A
  •  5.82 A