Question 1
A transmission line is operating with a voltage phase angle different of 30 degrees
between the sending 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.
Question 2
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
Question 3
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
Question 4
If a transmission line is carrying 400 MW and 300 MVAR what is the MVA?
1
@THE STUDY VAULT
,CORRECT ANSWER
3-4-5 triangle 500 MVA
Question 5
The prime mover is the component of the generator that creates the rotational force. In a
typical coal fired steam generator what component spins the rotor?
CORRECT ANSWER
Turbine
Question 6
Reactive reserve response during a disturbance is best obtained from which devise?
CORRECT ANSWER
Synchronous condensers
Question 7
For two identically constructed transmission lines where Line A is 150 miles long and line B
is 15 miles long, if both lines are lightly loaded?
CORRECT ANSWER
A produces more reactive power than B.
Question 8
Lightly loaded transmission lines essentially behave like?
CORRECT ANSWER
Shunt Capacitors
2
@THE STUDY VAULT
,Question 9
You receive an alarm that indicates low oil pressure on an underground transmission
cable. SCADA shows the pressure is continuing to drop. What is the first step you take to
protect the line?
CORRECT ANSWER
Isolate the line
Question 10
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 distribution factor for the scheduled path?
CORRECT ANSWER
63%
Question 11
Which statement best describes how reactive power MVAR power normally flows?
CORRECT ANSWER
High Voltage to Low Voltage
Question 12
Which of the following types of data are BA and RC not required to share with one
another?
CORRECT ANSWER
Generator start up cost
3
@THE STUDY VAULT
, Question 13
TOP must develop, maintain, and implement formal policies and procedures to provide for
transmission reliability. Which of the following DOES NOT need to be addressed in these
policies and procedures?
CORRECT ANSWER
Planned outages of generation units
Question 14
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
Question 15
Which of the following types of MW load is the most impacted by an intentional frequency
reduction?
CORRECT ANSWER
Motor
Question 16
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 collapses within a few seconds. The most likely cause of the collapse?
CORRECT ANSWER
Angle Instability
4
@THE STUDY VAULT
A transmission line is operating with a voltage phase angle different of 30 degrees
between the sending 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.
Question 2
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
Question 3
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
Question 4
If a transmission line is carrying 400 MW and 300 MVAR what is the MVA?
1
@THE STUDY VAULT
,CORRECT ANSWER
3-4-5 triangle 500 MVA
Question 5
The prime mover is the component of the generator that creates the rotational force. In a
typical coal fired steam generator what component spins the rotor?
CORRECT ANSWER
Turbine
Question 6
Reactive reserve response during a disturbance is best obtained from which devise?
CORRECT ANSWER
Synchronous condensers
Question 7
For two identically constructed transmission lines where Line A is 150 miles long and line B
is 15 miles long, if both lines are lightly loaded?
CORRECT ANSWER
A produces more reactive power than B.
Question 8
Lightly loaded transmission lines essentially behave like?
CORRECT ANSWER
Shunt Capacitors
2
@THE STUDY VAULT
,Question 9
You receive an alarm that indicates low oil pressure on an underground transmission
cable. SCADA shows the pressure is continuing to drop. What is the first step you take to
protect the line?
CORRECT ANSWER
Isolate the line
Question 10
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 distribution factor for the scheduled path?
CORRECT ANSWER
63%
Question 11
Which statement best describes how reactive power MVAR power normally flows?
CORRECT ANSWER
High Voltage to Low Voltage
Question 12
Which of the following types of data are BA and RC not required to share with one
another?
CORRECT ANSWER
Generator start up cost
3
@THE STUDY VAULT
, Question 13
TOP must develop, maintain, and implement formal policies and procedures to provide for
transmission reliability. Which of the following DOES NOT need to be addressed in these
policies and procedures?
CORRECT ANSWER
Planned outages of generation units
Question 14
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
Question 15
Which of the following types of MW load is the most impacted by an intentional frequency
reduction?
CORRECT ANSWER
Motor
Question 16
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 collapses within a few seconds. The most likely cause of the collapse?
CORRECT ANSWER
Angle Instability
4
@THE STUDY VAULT
