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NERC Question Practice Test Questions and Answers.
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NERC Question Practice Test Questions and Answers.
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NERC Question Practice Test Questionsand Answers
A .transmission .line .is .operating .with .a .voltage .phase .angle .different .of .30 .degrees .between .the .sen
ding .Vs .and .the .receiving .bus .Vr. .If .the .receiving .end .load .is .suddenly .increased, .the .voltage .phase .
angle .difference .will .be? .- .(correct .answer) .-
The .phase .angle .will .increase. .When .load .is .increased .phase .angle .will .increase.
A .load .has .a .power .factor .of .0.9 .lagging. .If .the .load .draws .100 .MVA, .what .is .the .MW .draw? .- .
(correct .answer) .-90 .pf= .mw/mva
The .high .side .of .a .delta-wye .connection .transformer .is .connected .to .a .power .system .with .199 .kV .L-
G .high .side .voltage. .What .is .the .voltage .across .the .delta .winding .of .the .transformer? .- .
(correct .answer) .-Vl-l= .square .root .of .3 .times .Vl-g .1.73x191= .345kV
If .a .transmission .line .is .carrying .400 .MW .and .300 .MVAR .what .is .the .MVA? .- .(correct .answer) .-3-4-5
.triangle .500 .MVA
The .prime .mover .is .the .component .of .the .generator .that .creates .the .rotational .force. .In .a .typical .c
oal .fired .steam .generator .what .component .spins .the .rotor? .- .(correct .answer) .-Turbine
Reactive .reserve .response .during .a .disturbance .is .best .obtained .from .which .devise? .- .
(correct .answer) .-Synchronous .condensers
For .two .identically .constructed .transmission .lines .where .Line .A .is .150 .miles .long .and .line .B .is .15 .mi
les .long, .if .both .lines .are .lightly .loaded? .- .(correct .answer) .-
A .produces .more .reactive .power .than .B.
Lightly .loaded .transmission .lines .essentially .behave .like? .- .(correct .answer) .-Shunt .Capacitors
You .receive .an .alarm .that .indicates .low .oil .pressure .on .an .underground .transmission .cable. .SCADA .s
hows .the .pressure .is .continuing .to .drop. .What .is .the .first .step .you .take .to .protect .the .line? .- .
(correct .answer) .-Isolate .the .line
,Computer .simulations .show .that .for .a .100 .MW .schedule .from .Bus .A .to .Bus .B, .63% .of .the .schedule .
will .flow .on .the .scheduled .path .and .the .remainder .will .flow .on .other .parallel .paths. .What .is .the .dis
tribution .factor .for .the .scheduled .path? .- .(correct .answer) .-63%
Which .statement .best .describes .how .reactive .power .MVAR .power .normally .flows? .- .
(correct .answer) .-High .Voltage .to .Low .Voltage
Which .of .the .following .types .of .data .are .BA .and .RC .not .required .to .share .with .one .another? .- .
(correct .answer) .-Generator .start .up .cost
TOP .must .develop, .maintain, .and .implement .formal .policies .and .procedures .to .provide .for .transmiss
ion .reliability. .Which .of .the .following .DOES .NOT .need .to .be .addressed .in .these .policies .and .proced
ures? .- .(correct .answer) .-Planned .outages .of .generation .units
A .1000 .MVA .rated .generator .that .produces .800 .MW .and .100 .MVAR .is .best .described .as? .- .
(correct .answer) .-Operating .in .a .lagging .mode. .Inductive .system
Which .of .the .following .types .of .MW .load .is .the .most .impacted .by .an .intentional .frequency .reductio
n? .- .(correct .answer) .-Motor
Assume .there .are .two .250 .mile .long .transmission .lines .exporting .an .excessive .amount .of .MW .from .
a .generation .area .to .a .load .area. .One .of .the .lines .suddenly .trips .and .the .area .power .system .collaps
es .within .a .few .seconds. .The .most .likely .cause .of .the .collapse? .- .(correct .answer) .-Angle .Instability
The .phase .voltage .in .a .wye-connected .load .is .277 .V. .What .is .the .line .to .line .voltage? .- .
(correct .answer) .-480 .V
A .simple .power .system .is .composed .of .three .lines .connecting .generation .to .load. .Each .lines .the .sa
me .impedance, .is .initially .loaded .at .200 .MW, .and .has .a .thermal .limit .of .400 .MW. .If .one .line .trips, .
what .the .loading .on .the .shortest .remaining .line .be .and .will .the .thermal .limit .either .remaining .line .
be .violated? .- .(correct .answer) .-300 .MW .and .No
The .best .prediction .of .system .load .is .the .load .forecast .tool .that .uses? .- .(correct .answer) .-
Forecasted .Weather
If .the .phase .angel .at .an .open .breaker .is .equal .to .1/10 .of .a .cycle, .this .is .the .the .same .angle .as? .- .
(correct .answer) .-1/10 .of .360 .so .36
A .___________ .tool .is .used .to .ensure .the .power .system .can .respond .within .acceptable .limits .of .N-
1 .- .(correct .answer) .-Contingency .Analysis
Which .of .the .following .activities .would .not .be .included .in .the .procedures .for .transmission .reliability
? .- .(correct .answer) .-Ancillary .service .pricing
, The .transmission .Operator .and .BA .shall .provide .documentation .that .operating .personnel .have .____
__ .to .implement .real .time .actions .to .ensure .the .stable .and .reliable .operation .of .the .BES. .- .
(correct .answer) .-Proper .NERC .Certification .Credential
A .utility .distribution .bus .has .the .following .customer .loads .attached. .What .is .the .total .customer .MW
.load .and .is .the .total .customer .load .capacitive .or .inductive? .5 .MW .1 .MVAR .& .3 .MW .1 .MVAR .& .2 .
MW .-2 .MVAR .& .10 .MW .3 .MVAR .- .(correct .answer) .-20 .mw .and .Inductive
How .many .MVARs .does .a .230 .kV, .50 .MVAR .capacitor .bank .provide .when .the .voltage .id .207 .kV .- .
(correct .answer) .-Actual .MW/ .Rated .MW .^2 .x .Capacitor .Rating
40
You .are .a .system .operator .and .the .load .forecast .is .for .an .all .time .summer .peak .load .day, .generatio
ns .and .reactive .resources .will .be .tight. .Which .scheduled .job .would .you .allow .to .proceed? .- .
(correct .answer) .-735 .kV .shunt .reactor .maintenance.
A .contingency .results .in .the .exceedance .of .an .IROL. .What .could .be .the .result .if .the .IROL .is .allowed .
to .be .exceeded .longer .than .T .sub .v .- .(correct .answer) .-
Interruption .of .power .to .a .large .part .of .the .BES
Generators .have .the .ability .to .be .used .as .voltage .control .devices. .If .a .generator .raises .its .VAR .outp
ut, .the .system .orator .should .expect .system .stage .to? .- .(correct .answer) .-Increase
The .actual .voltage .is .362kV .on .a .345 .bus. .What .is .the .p.u. .voltage? .- .(correct .answer) .-1.05
In .the .initial .stages .of .a .system .restoration .condition .high .transmission .system .voltage .problems .are
.more .likely .than .low .transmission .system .voltage .problems .why? .- .(correct .answer) .-
Because .of .excessive .MVAR .supply .from .the .energization .of .transmission .lines
All .transmission .operators .shall .operate .so .that .instability .uncontrolled .separation .or .cascading .outa
ges .will .not .occur .in .result .of? .- .(correct .answer) .-Most .severe .single .contingency .MSSC
A .230kV .transmission .line .is .energized .at .230kV .and .is .100 .miles .long. .What .is .the .approximate .line
.charging .contribution? .- .(correct .answer) .-30MVAR
When .the .system .is .on .the .verge .of .a .voltage .collapse .and .nothing .else .can .be .done .to .alleviate .th
e .problem, .operating .personnel .should? .- .(correct .answer) .-Shed .Load
The .transmission .operator .shall .take .corrective .actions .necessary .to .prevent .voltage .collapse .when .r
eactive .resources .are .insufficient .including? .- .(correct .answer) .-Shedding .Load
There .is .a .SPS/RAS .system .out .of .service .for .maintenance .in .your .BA. .What .actions .do .you .take? .- .
(correct .answer) .-Operate .within .system .limits .that .the .SPS/RAS .is .designed .to .protect .against
If .a .BA .has .500 .MW .of .spinning .Reserves .and .of .that .300 .MW .are .Regulating .Reserves .by .definition
.NERC .requires .the .Regulating .Reserves .must .be? .- .(correct .answer) .-On .line .and .AGC .responsive
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