6TH MONTH FINAL

Question 1

THE LOSS OF THE MAGNETIC BONDS THAT BIND TOGETHER THE ELEMENTS OF A POWER SYSTEM IS KNOWN AS

Answer 1

ALL OF THE ABOVE

Question 2

IF A 2 POLE GENERATOR’S ROTOR IS SPINNING AT 3601 RPM WHILE THE GENERATOR IS CONNECTED TO A 60HZ SYSTEM, HOW FAST IS THE GENERATOR’S TORQUE ANGLE CHANGING

Answer 2

6 DEGREES PER SECOND

Question 3

NEGLECTING LOSSES, THE DIFFERENCE BETWEEN A GENERATOR’S MECHANICAL POWER INPUT AND ELECTRICAL POWER OUTPUT IS CALLED

Answer 3

ACCELERATING POWER

Question 4

STEADY STATE INSTABILITY

Answer 4

SLOWLY DEVELOPING EVENT

Question 5

TRANSIENT INSTABILITY

Answer 5

RAPIDLY DEVEILOPING EVENT

Question 6

OSCILLATORY INSTABILITY

Answer 6

EXCITATION SYSTEMS ARE COMMON CAUSE

Question 7

ACCORDING TO THE EQUAL AREA CRITERION FOR TRANSIENT STABILITY

Answer 7

THE DECELERATING AREA MUST AT LEAST MATCH THE ACCELERATING AREA

Question 8

A GENERATOR IS ANGLE UNSTABLE WHENEVER IT’S TORQUE ANGLE EXCEEDS 90 DEGREES

Answer 8

FALSE

Question 9

HIGH SPEED TRANSMISSION PROTECTION IS A BENEFIT TO ANGLE STABILITY BECAUSE

Answer 9

ALL OF THE ABOVE

Question 10

THE PRIMARY DIFFERENCE BETWEEN AN OUT OF STEP EVENT AND A FAULT IS

Answer 10

THE SPEED AT WHICH THE IMPEDANCE CHANGES

Question 11

WHEN A POWER SYSTEM IS ANGLE STABLE IT HAS WHAT 3 CHARACTERISTICS

Answer 11

SUSTAINED GENERATOR TORQUE ANGLES OF LESS THAN 90
SUSTAINED POWER ANGLES OF LESS THAN 90
A TORQUE ANGLE OF 25

Question 12

WHAT ARE THE 3 CLASSIFICATIONS OF ANGLE STABILITY

Answer 12

STEADY STATE
OSCILLATORY
TRANSIENT

Question 13

ANGLE STABILITY IS NOT LIKE VOLTAGE CONTROL IN WHICH A SYSTEM OPERATOR HAS THE TIME TO CORRECT VOLTAGE DEVIATION

Answer 13

TRUE

Question 14

FOR A GENERATOR’S TORQUE ANGLE TO CHANGE THER EMUST BE WHAT

Answer 14

ACCELERATING POWER

Question 15

WHAT ARE TWO ACTIONS AVAILABLE TO A SYSTEM OPERATOR TO ASSIST WITH MAINTAINING ANGLE STABILITY

Answer 15

MAINTAINING SYSTEM VOLTAGE LEVELS AS HIGH AS POSSIBLE

MAINTAINING THE SYSTEM IMPEDANCE AS LOW AS POSSIBLE

Question 16

THE NOMINAL LOAD IS

Answer 16

EQUAL TO THE RATED LOAD

Question 17

A PERIOD OF VOLTAGE INSTABILITY WILL ALWAYS RESULT IN A VOLTAGE COLLAPSE

Answer 17

FALSE

Question 18

THE CRITICAL VOLTAGE AND CRITICAL MW TRANSFER ARE LOCATED AT THE

Answer 18

KNEE OF THE P-V CURVE

Question 19

DURING VOLTAGE COLLAPSE PRONE CONDITIONS, TAP CHANGING TO SUPPORT SECONDARY VOLTAGE SHOULD GENERALLY NOT BE USED IF THE SECONDARY LOAD IS FORMED BY

Answer 19

NON-MOTOR TYPE LOAD

Question 20

P-V CURVES INDICATE THE ___ MARGIN FROM VOLTAGE INSTABILITY WHILE V-Q CURVES INDICATE THE ___ MARGIN FROM VOLTAGE STABILITY

Answer 20

MW/MVAR

Question 21

UVLS DIFFERS FROM UFLS IN THAT

Answer 21

UVLS IS BASED ON VOLTAGE WHILE UFLS IS BASED ON FREQUENCEY

Question 22

IN WHICH TYPE OF VOLTAGE COLLAPSE DOES A KEY ELEMENT OUTAGE TRIGGER THE COLLAPSE

Answer 22

CLASSICAL VOLTAGE COLLAPSE

Question 23

A P-V CURVE RELATES

Answer 23

THE MW TRANSFERRED ACROSS A SYSTEM TO THE VOLTAGE AT THE RECEIVING END OF THE SYSTEM

Question 24

IN A RADIAL POWER SYSTEM, THE ADDITION OF SHUNT CAPACITORS AT THE RECEIVING END OF THE SYSTEM TENDS TO

Answer 24

FLATTEN THE P-V CURVE AND INCREASE THE CRITICAL VOLTAGE

Question 25

IN WHICH TYPE OF VOLTAGE COLLAPSE DOES A SIMULTANEOUS STALLING OF LARGE AMOUNTS OF INDUCTION MOTOR LOAD TRIGGER THE VOLTAGE COLLAPSE

Answer 25

TRANSIENT VOLTAGE COLLAPSE

Question 26

A RADIAL POWER SYSTEM IS A POWER SYSTEM IN WHICH GENERATION AND LOAD AREAS ARE SEPARATED BY A TRANSMISSION PATH

Answer 26

TRUE

Question 27

TAP CHANGER IMPACT IS NOT ONLY DUE TO THEIR DRAW OF REACTIVE POWER FROM THE HIGH SIDE BUT ALSO TO

Answer 27

THEIR IMPACT ON THE MAGNITUDE OF CUSTOMER LOAD

Question 28

POWER SYSTEM LOAD IS CONSTANTLY CHANGING

Answer 28

TRUE

Question 29

THE INCREASING/DECLINING VOLTAGES DUE TO THE SUDDEN INCREASE IN MVAR DEMAND MAY CAUSE UNCONTROLLED TRIPPING AND RAPID COLLAPSE OF THE AREA POWER SYSTEM

Answer 29

DECLINING

Question 30

DYNAMIC REACTIVE RESERVES ARE TYPICALLY CARRIED IN

Answer 30

SYNCHRONOUS GENERATORS, SYNCHRONOUS CONDENSERS OR SVC’C

Question 31

IF MANUAL LOAD IS TO BE USED TO AVOID VOLTAGE COLLAPSE WHICH 3 OPERATING PROCEDURES SHOULD BE PERFORMED

Answer 31

PROVIDE ASSISTANCE TO THE SYSTEM OPERATOR TO HELP INDENTIFY VOLTAGE COLLAPSE PRONE CONDITIONS
DESCRIBE THE CONDITIONS IN WHICH LOADS ARE AVAILABLE FOR SHEDDING MAY BE USED
CLEARLY IDENTIFY WHICH LOADS ARE AVAILABLE FOR SHEDDING AND WHICH LOADS SHOULD BE SHED FOR DIFFERENT SYSTEM CONDITIONS

Question 32

AS A SYSTEM OPERATOR YOU CAN PREVENT ALL TYPES OF VOLTAGE COLLAPSE

Answer 32

FALSE

Question 33

AS A LAST RESORT TO AVOID A VOLTAGE COLLAPSE A SYSTEM OPERATOR SHOULD DO WHAT

Answer 33

MANUALLY DROP LOAD