Electric Circuits
The delta equation of given star connected impedance ZQR is equal to

 (20 + j10) Ω.
 40 Ω.
  (10 + j30) Ω.
 (5 + j10 / 3) Ω.

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Electric Circuits
Two electric bulbs have transparent filament of same thickness. It one of them gives 60 W and other gives 100 W, then-

 60 W lamp filament has shorter length.
 60 W and 100 W lamp filament have equal length.
 60 W lamp filament has longer length.
 100 W lamp filament has longer length.

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