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Transformer: Quiz


Question 1: Transformers range in size from a thumbnail-sized coupling transformer hidden inside a stage ________ to huge units weighing hundreds of tons used to interconnect portions of power grids.
Sound cardMicrophoneCentral processing unitHard disk drive

Question 2: The phenomenon of electromagnetic induction was discovered independently by Michael Faraday and ________ in 1831.
Alexander Dallas BacheAlbert Abraham MichelsonJoseph HenryCharles Doolittle Walcott

Question 3: What does the following picture show?

  An ideal transformer
  Prototypes of the world's first high-efficiency transformers. (Széchenyi István Memorial Exhibition Nagycenk)
  Laminated core transformer showing edge of laminations at top of photo
  Image of an electrical substation in Melbourne, Australia showing 3 of 5 220kV/66kV transformers, each with a capacity of 185MVA

Question 4: [57] A strip construction ensures that the ________ are optimally aligned, improving the transformer's efficiency by reducing the core's reluctance.
CrystalliteGrain boundaryZincCrystallography

Question 5: [26] When a voltage is applied to the primary winding, a small current flows, driving flux around the ________ of the core.
Magnetic reluctanceMaxwell's equationsMagnetic fieldMagnetic circuit

Question 6: Experimental power transformers in the 2 MVA range have been built with ________ windings which eliminates the copper losses, but not the core steel loss.
NiobiumFlux pumpingSuperconductivityIron-based superconductor

Question 7: [citation needed] In 1891 ________ invented the Tesla coil, an air-cored, dual-tuned resonant transformer for generating very high voltages at high frequency.
Wardenclyffe TowerNikola TeslaElectricityAlexander Graham Bell

Question 8: What does the following picture show?

  Laminated core transformer showing edge of laminations at top of photo
  Current transformers, designed for placing around conductors
  An ideal transformer
  Cut-away view of three-phase oil-cooled transformer. The oil reservoir is visible at the top. Radiative fins aid the dissipation of heat.

Question 9: In 1878, the Ganz Company in Hungary began manufacturing equipment for electric lighting, and by 1883 had installed over fifty systems in ________.
Holy Roman EmpireGerman EmpireAustria–HungaryOttoman Empire

Question 10: [2] The relationship between ________ (EMF) or "voltage" and magnetic flux was formalized in an equation now referred to as "Faraday's law of induction":
Electric currentElectromotive forceMaxwell's equationsElectromagnetism

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