Question
In a certain three-wire Y-connected generator, the phase voltages are 3.3 KV. The magnitudes of the line voltages are 1) 2kV 2) 6.75kV 3) 3.3kV 4) 5.715kV In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of 1) 60 degree 2) 90 degree 3) 120 degree 4) 30 degree In a three-phase supply floating neutral is undesirable because its way give rise to 1) Unequal line voltages across the load 2) Low voltage across the load 3) High voltage across the load 4) zero voltage across the load In a certain series resonance circuit V_c' = 120V, V_R = 75V and V_L = 215V The value of the source voltage is 1) 75 2) 45 3) 120 4) 215 In a series RLC circuit that is operating above the resonance frequency, the current 1) Lags the voltage supply 2) Equal to the voltage supplied 3) Leads the voltage supply 4) In phase with the voltage If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth 1) Disappears 2) Decreases
Explanation / Answer
Answer 1 : option 4 : line voltage in Y = sqrt(3)* phase vltage = 5.175
Answer 2 : option 4 : As we know the phase angle between line voltage and phase voltage is 30 degree. the phase difference between any 2 phase is 120 deg, t
Answer 3: option 1 : fact
Answer 4: option 3 : Vs^2 = (Vr^2 + (Vl^2 - Vc^2)^2) = 121.03
Answer5: option 1
Answer 6: option 2