PE ELECTRICAL POWER 2025 EXAM
QUESTIONS WITH CORRECT ANSWERS
PE Exam: Electrical Power 2025
135 QUESTIONS AND ANSWERS
Three Identical complex 1-phase impedance loads are delta-connected to make
a complex 3-phase load. Assuming balanced conditions, select the answer that
describes what would happen if the same load was wye connected instead
a) The load would draw the same amount of line current
b)The load would draw 1.73 times more line current
c) The load would draw 1.73 times less line current
d) The load would draw 3 times less line current - ANSWER ZY = ZD/3.
Therefore with Ohm's law V=IR
In wye connected load:
I = Vp/ZY
In delta connected load
I = Vp/ZD/3 or I = 3Vp/ZD
Answer: D - The load would draw 3 times less current
Three Identical complex 1-phase impedance loads are wye connected to make a
complex 3-phase load. Assuming balanced conditions, select the answer that
describes what would happen if the same load was delta connected instead
a) The load would draw the same amount of apparent power
b) The load would draw 3 times more apparent power
c) The load would draw 1.73 times more apparent power
d) The load would draw 1.73 times less apparent power - ANSWER Apparent
Power = 1.73 VI
,In wye connected load:
I = Vp/ZY
In delta connected load
I = Vp/ZD/3 or I = 3Vp/ZD
Line Current is 3 times more there for apparent power (S) will also be 3 times
more.
Answer: B - The load would draw 3 times more apparent power
A complex 3-phase wye connected load and complex 3-phase delta connected
load both have the same power rating and power factor. Select the statement
that is true
a) Both loads will draw the same amount of line current
b) The wye connected load will draw 3 times more line current compared to the
delta connected load
c) The wye connected load will draw 3 times less line current compared to the
delta connected load
d) The wye connected load will draw 1.73 times less line current compared to
the delta connected load - ANSWER Same power rating means they output the
same power.
wye power = delta power
Answer: A - Both loads will draw the same amount of line current
For a balanced and positive (ABC) sequence system, select the statement that is
true for wye connection
a) The phase voltage and line voltage are IN PHASE
b) The phase voltage LEADS the line voltage by 30 degrees
c) The phase voltage LAGS the line voltage by 30 degrees
d) The displacement angle between the phase voltage and line voltage depends
on the load - ANSWER In Positive Wye connection:
Vphase Lags Vline by 30 degrees
, Answer: C - The phase voltage LAGS the line voltage by 30 degrees
For a balanced and positive (ABC) sequence system, select the statement that is
true for a delta connection
a) The phase current and line current are IN PHASE
b) The phase current LEADS the line current by 30 degrees
c) The Phase current LAGS the line current by 30 degrees
d) The displacement angle between the phase current and line current depends
on the load. - ANSWER In positive Delta connection:
Iphase LEADS Iline by 30 degrees
Answer: B - The Phase current LEADS the line current by 30 degrees
For a Balanced and negative (ACB) sequence system, select the statement
below that is true for a wye connection.
a) The phase voltage and line voltage are IN PHASE
b) The phase voltage LEADS the line voltage by 30 degrees
c) The phase voltage LAGS the line voltage by 30 degrees
d) The displacement angle between the phase voltage and line voltage depends
on the load - ANSWER In negative Wye connection:
Vphase Leads Vline by 30 degrees
Answer: B - The phase voltage LEADS the line voltage by 30 degrees
For a balanced and negative (ACB) sequence system, select the statement that is
true for a delta connection
a) The phase current and line current are IN PHASE
b) The phase current LEADS the line current by 30 degrees
c) The Phase current LAGS the line current by 30 degrees
d) The displacement angle between the phase current and line current depends
on the load. - ANSWER In negative Delta connection:
QUESTIONS WITH CORRECT ANSWERS
PE Exam: Electrical Power 2025
135 QUESTIONS AND ANSWERS
Three Identical complex 1-phase impedance loads are delta-connected to make
a complex 3-phase load. Assuming balanced conditions, select the answer that
describes what would happen if the same load was wye connected instead
a) The load would draw the same amount of line current
b)The load would draw 1.73 times more line current
c) The load would draw 1.73 times less line current
d) The load would draw 3 times less line current - ANSWER ZY = ZD/3.
Therefore with Ohm's law V=IR
In wye connected load:
I = Vp/ZY
In delta connected load
I = Vp/ZD/3 or I = 3Vp/ZD
Answer: D - The load would draw 3 times less current
Three Identical complex 1-phase impedance loads are wye connected to make a
complex 3-phase load. Assuming balanced conditions, select the answer that
describes what would happen if the same load was delta connected instead
a) The load would draw the same amount of apparent power
b) The load would draw 3 times more apparent power
c) The load would draw 1.73 times more apparent power
d) The load would draw 1.73 times less apparent power - ANSWER Apparent
Power = 1.73 VI
,In wye connected load:
I = Vp/ZY
In delta connected load
I = Vp/ZD/3 or I = 3Vp/ZD
Line Current is 3 times more there for apparent power (S) will also be 3 times
more.
Answer: B - The load would draw 3 times more apparent power
A complex 3-phase wye connected load and complex 3-phase delta connected
load both have the same power rating and power factor. Select the statement
that is true
a) Both loads will draw the same amount of line current
b) The wye connected load will draw 3 times more line current compared to the
delta connected load
c) The wye connected load will draw 3 times less line current compared to the
delta connected load
d) The wye connected load will draw 1.73 times less line current compared to
the delta connected load - ANSWER Same power rating means they output the
same power.
wye power = delta power
Answer: A - Both loads will draw the same amount of line current
For a balanced and positive (ABC) sequence system, select the statement that is
true for wye connection
a) The phase voltage and line voltage are IN PHASE
b) The phase voltage LEADS the line voltage by 30 degrees
c) The phase voltage LAGS the line voltage by 30 degrees
d) The displacement angle between the phase voltage and line voltage depends
on the load - ANSWER In Positive Wye connection:
Vphase Lags Vline by 30 degrees
, Answer: C - The phase voltage LAGS the line voltage by 30 degrees
For a balanced and positive (ABC) sequence system, select the statement that is
true for a delta connection
a) The phase current and line current are IN PHASE
b) The phase current LEADS the line current by 30 degrees
c) The Phase current LAGS the line current by 30 degrees
d) The displacement angle between the phase current and line current depends
on the load. - ANSWER In positive Delta connection:
Iphase LEADS Iline by 30 degrees
Answer: B - The Phase current LEADS the line current by 30 degrees
For a Balanced and negative (ACB) sequence system, select the statement
below that is true for a wye connection.
a) The phase voltage and line voltage are IN PHASE
b) The phase voltage LEADS the line voltage by 30 degrees
c) The phase voltage LAGS the line voltage by 30 degrees
d) The displacement angle between the phase voltage and line voltage depends
on the load - ANSWER In negative Wye connection:
Vphase Leads Vline by 30 degrees
Answer: B - The phase voltage LEADS the line voltage by 30 degrees
For a balanced and negative (ACB) sequence system, select the statement that is
true for a delta connection
a) The phase current and line current are IN PHASE
b) The phase current LEADS the line current by 30 degrees
c) The Phase current LAGS the line current by 30 degrees
d) The displacement angle between the phase current and line current depends
on the load. - ANSWER In negative Delta connection:
