EEE 360; EXAM 1 QUESTIONS AND
ANSWERS 2026 VERIFIED.
If the power is positive, the element is absorbing or supplying power. - ANS absorbing, like a
load
If the power is negative, the element is absorbing or supplying power. - ANS supplying, like a
generator.
The RMS value of v(t) = Vmaxcos(wt + theta) is given by: - ANS Vmax / 2^0.5
For balanced wye-delta loads, Z delta = ? - ANS Z delta = 3Zy
For delta transformers, Vphase = ? - ANS V line to line. There is no neutral
In wye circuits, Phase = ? - ANS V line to neutral voltage
Step-down transformers - ANS Wye-delta transformers are frequently used as this.
current magnitude - ANS I_M = rad(2)I_rms
Complex Power (VA) - ANS S = V_rms x I*_rms;
@2026/2027 ALLRIGHTS RESERVED.
, 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 - ANS inductive
In this circuit, the current leads the applied voltage - ANS capacitive
Resistor real power equation - ANS S_R = V_R x I*
Capacitive reactive power [negative] equation - ANS S_C = V_C x I*
Voltage source complex power equation - ANS S_S = V_S x I*
Voltage regulation - ANS The difference between the magnitudes of the voltage at the load
terminals for the no-load (V_no-load) and (full) load conditions divided by the load voltage
(V_load) magnitude
Voltage regulation generalizations - ANS Typically, the voltage regulation should be less than
10%.
Overvoltage in no-load condition must be less than 5%.
The voltage drop in full load condition should not be more than -5%.
@2026/2027 ALLRIGHTS RESERVED.
ANSWERS 2026 VERIFIED.
If the power is positive, the element is absorbing or supplying power. - ANS absorbing, like a
load
If the power is negative, the element is absorbing or supplying power. - ANS supplying, like a
generator.
The RMS value of v(t) = Vmaxcos(wt + theta) is given by: - ANS Vmax / 2^0.5
For balanced wye-delta loads, Z delta = ? - ANS Z delta = 3Zy
For delta transformers, Vphase = ? - ANS V line to line. There is no neutral
In wye circuits, Phase = ? - ANS V line to neutral voltage
Step-down transformers - ANS Wye-delta transformers are frequently used as this.
current magnitude - ANS I_M = rad(2)I_rms
Complex Power (VA) - ANS S = V_rms x I*_rms;
@2026/2027 ALLRIGHTS RESERVED.
, 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 - ANS inductive
In this circuit, the current leads the applied voltage - ANS capacitive
Resistor real power equation - ANS S_R = V_R x I*
Capacitive reactive power [negative] equation - ANS S_C = V_C x I*
Voltage source complex power equation - ANS S_S = V_S x I*
Voltage regulation - ANS The difference between the magnitudes of the voltage at the load
terminals for the no-load (V_no-load) and (full) load conditions divided by the load voltage
(V_load) magnitude
Voltage regulation generalizations - ANS Typically, the voltage regulation should be less than
10%.
Overvoltage in no-load condition must be less than 5%.
The voltage drop in full load condition should not be more than -5%.
@2026/2027 ALLRIGHTS RESERVED.
