EPRI TEST QUESTIONS AND CORRECT ANSWERS
LATEST UPDATED
d. Reduces the losses by four times.
120 volts is fed to a customer. While the amount of the load remains constant,
the customer voltage doubles. How does this impact the power losses?
The losses are doubled.
b. Splits losses in half
c. Boosts the losses by four times.
d. Reduces the losses by four times.
b. 1.05
On a 345 kV bus, the actual voltage is 362 kV. What is the voltage per unit
(p.u.)?
a. 1.0 b. 1.05 c. 1.5 d. 0.95
b. 90
The power factor of a load is 0.9 lagging. What is the MW draw if the load
draws 100 MVA?
100 b. 90 c. 111 d. 44 a.
a. Indeed
A gearbox line has a 1000 MVA rating. At the moment, the power flow is 1001
MVar and 0 MW. Is there too much traffic on this transmission line?
a. Yes b. No c. Uncertain d. There is no load on the queue
d. 500 MW
It has been established that a transmission path's Total Transfer Capability
(TTC) maximum is 1000 MW from east to west. On this route, the operator
sells 500 MW. What is the Available Transfer Capability (ATC) of this path?
1000 MW, 1500 MW, 0 MW, and 500 MW
, a. 20 MW
The planned flow from Bus "X" to Bus "Y" is 200 MW. For this schedule, the
distribution factor for transmission line "A-B" is 10%. How much of
transmission line "A-B" will carry the 200 MW schedule?
20 MW, 40 MW, 180 MW, and 200 MW are possible.
c. 200 MW
In a typical 10,000 MW system, a 1% change in frequency will result in what
approximate amount of load change, according to the load/frequency
relationship?
500 MW and 1000 MW
c. 200 MW d. 50 MW
A governor that is isochronous
The terms "flat frequency control," "transient droop," "blocked governor," and
"isochronous governor" all refer to a governor with zero droop.
d. Everything mentioned above
The frequency bias setting of a balancing authority is equivalent to: a. the
frequency response characteristics (FRC) of the control area; b. the balancing
area's natural response; and c. the bias value of the AGC system.
d. Everything mentioned above
b. +75 MW
The bias of a balancing authority is -150 MW/0.1 Hz. A disturbance from
outside causes the frequency to drop by 0.05 Hz. What is the expected number
of MW provided by this Balancing Authority?
-75 MW, +75 MW, -150 MW, and +150 MW
d. 3 Hz
In a 60.00 Hz system, what size frequency shift would cause a 5% droop
generator to transition from zero to full output?
10 Hz, 6 Hz, and 5 Hz
d. 3 Hz
When a 50 MVar shunt capacitor is powered at 90% of its nominal voltage,
LATEST UPDATED
d. Reduces the losses by four times.
120 volts is fed to a customer. While the amount of the load remains constant,
the customer voltage doubles. How does this impact the power losses?
The losses are doubled.
b. Splits losses in half
c. Boosts the losses by four times.
d. Reduces the losses by four times.
b. 1.05
On a 345 kV bus, the actual voltage is 362 kV. What is the voltage per unit
(p.u.)?
a. 1.0 b. 1.05 c. 1.5 d. 0.95
b. 90
The power factor of a load is 0.9 lagging. What is the MW draw if the load
draws 100 MVA?
100 b. 90 c. 111 d. 44 a.
a. Indeed
A gearbox line has a 1000 MVA rating. At the moment, the power flow is 1001
MVar and 0 MW. Is there too much traffic on this transmission line?
a. Yes b. No c. Uncertain d. There is no load on the queue
d. 500 MW
It has been established that a transmission path's Total Transfer Capability
(TTC) maximum is 1000 MW from east to west. On this route, the operator
sells 500 MW. What is the Available Transfer Capability (ATC) of this path?
1000 MW, 1500 MW, 0 MW, and 500 MW
, a. 20 MW
The planned flow from Bus "X" to Bus "Y" is 200 MW. For this schedule, the
distribution factor for transmission line "A-B" is 10%. How much of
transmission line "A-B" will carry the 200 MW schedule?
20 MW, 40 MW, 180 MW, and 200 MW are possible.
c. 200 MW
In a typical 10,000 MW system, a 1% change in frequency will result in what
approximate amount of load change, according to the load/frequency
relationship?
500 MW and 1000 MW
c. 200 MW d. 50 MW
A governor that is isochronous
The terms "flat frequency control," "transient droop," "blocked governor," and
"isochronous governor" all refer to a governor with zero droop.
d. Everything mentioned above
The frequency bias setting of a balancing authority is equivalent to: a. the
frequency response characteristics (FRC) of the control area; b. the balancing
area's natural response; and c. the bias value of the AGC system.
d. Everything mentioned above
b. +75 MW
The bias of a balancing authority is -150 MW/0.1 Hz. A disturbance from
outside causes the frequency to drop by 0.05 Hz. What is the expected number
of MW provided by this Balancing Authority?
-75 MW, +75 MW, -150 MW, and +150 MW
d. 3 Hz
In a 60.00 Hz system, what size frequency shift would cause a 5% droop
generator to transition from zero to full output?
10 Hz, 6 Hz, and 5 Hz
d. 3 Hz
When a 50 MVar shunt capacitor is powered at 90% of its nominal voltage,
