EEE 360 MIDTERM 2 COMPLETE TEST PAPER
WITH CORRECT ANSWERS
◉ For balanced wye-delta loads, Z delta = ?
Answer: Z delta = 3Zy
◉ For delta transformers, Vphase = ?
Answer: V line to line. There is no neutral
◉ In wye circuits, Phase = ?
Answer: V line to neutral voltage
◉ Step-down transformers
Answer: Wye-delta transformers are frequently used as this.
◉ current magnitude
Answer: I_M = rad(2)I_rms
◉ Complex Power (VA)
Answer: S = V_rms x I*_rms;
S = P + jQ
, the rating of power equipment is described by the apparent power,
S, also measured in volt-amperes
P = real power
Q = reactive power
◉ In this circuit, the current lags the applied voltage
Answer: inductive
◉ In this circuit, the current leads the applied voltage
Answer: capacitive
◉ Resistor real power equation
Answer: S_R = V_R x I*
◉ Capacitive reactive power [negative] equation
Answer: S_C = V_C x I*
◉ Voltage source complex power equation
Answer: S_S = V_S x I*
◉ Voltage regulation
WITH CORRECT ANSWERS
◉ For balanced wye-delta loads, Z delta = ?
Answer: Z delta = 3Zy
◉ For delta transformers, Vphase = ?
Answer: V line to line. There is no neutral
◉ In wye circuits, Phase = ?
Answer: V line to neutral voltage
◉ Step-down transformers
Answer: Wye-delta transformers are frequently used as this.
◉ current magnitude
Answer: I_M = rad(2)I_rms
◉ Complex Power (VA)
Answer: S = V_rms x I*_rms;
S = P + jQ
, the rating of power equipment is described by the apparent power,
S, also measured in volt-amperes
P = real power
Q = reactive power
◉ In this circuit, the current lags the applied voltage
Answer: inductive
◉ In this circuit, the current leads the applied voltage
Answer: capacitive
◉ Resistor real power equation
Answer: S_R = V_R x I*
◉ Capacitive reactive power [negative] equation
Answer: S_C = V_C x I*
◉ Voltage source complex power equation
Answer: S_S = V_S x I*
◉ Voltage regulation