ELECTRICAL ENGINEERING
SOLUTIONS MANUAL OVERVIEW.
EXAM 2025 QUESTIONS AND ANSWERS
What is the formula for estimating power demand growth? - ANS P = P0 * e^(a(t−t0)), where
a is the average per unit growth rate, P is the demand in year t, and P0 is the given demand at
year t0.
What was the peak power demand in the United States in 1984? - ANS 480 GW.
What was the average growth rate of peak power demand used in the estimation? - ANS 3.4
percent.
Using the given MATLAB commands, what is the predicted peak power demand for the year
1999? - ANS 799.3398 GW.
What MATLAB command is used to plot the predicted peak demand? - ANS plot(t, P), grid.
What does the variable P0 represent in the demand estimation formula? - ANS The given
demand at year t0.
1 @COPYRIGHT THESTAR 2025/2026
,What does the variable a represent in the demand estimation formula? - ANS The average
per unit growth rate.
What is the time range used for predicting peak demand from 1984 to 1999? - ANS From
year 1984 (t0 = 84) to year 1999 (t = 99).
What is the significance of the variable t in the demand estimation formula? - ANS It
represents the year for which the demand is being estimated.
What is the expected energy consumption growth in a certain country over 10 years? -
ANS It is expected to double.
What is the formula for exponential growth used in energy consumption estimation? - ANS P
= P0 * e^(at), where a is the growth rate.
What does the variable P represent in the energy consumption growth formula? - ANS The
energy consumption at time t.
What is the purpose of estimating peak power demand? - ANS It is the starting point for
planning future electric power supply.
What is the significance of the year 1984 in the context of the notes? - ANS It is the base year
for estimating future peak power demand.
What is the relationship between the variables P, P0, and a in the context of power demand? -
ANS P is the future demand, P0 is the current demand, and a is the growth rate affecting
how P changes over time.
What type of growth does the formula P = P0 * e^(at) represent? - ANS Exponential growth.
2 @COPYRIGHT THESTAR 2025/2026
,What is the expected outcome of the plot generated by the MATLAB commands? - ANS A
visual representation of the predicted peak power demand from 1984 to 1999.
How is the growth rate a calculated if energy consumption is expected to double in 10 years? -
ANS Using the formula P = P0 * e^(at) and solving for a.
What does the variable t0 represent in the demand estimation formula? - ANS The base year
from which the demand is measured.
What is the primary focus of Chapter 1 in the provided notes? - ANS Problems related to
power demand estimation and growth.
What is the role of MATLAB in the context of the notes? - ANS To plot and analyze the
predicted peak demand based on the given formulas.
What does the term 'e' represent in the exponential growth formulas? - ANS The base of the
natural logarithm, approximately equal to 2.71828.
What is the significance of the year range from 1984 to 1999 in the context of power demand? -
ANS It is the period over which the peak power demand is being predicted.
What is the formula for solving for 'a' in the equation ln 2 = 10a? - ANS a = 0.693
What is the average load for January in the annual load table? - ANS 8 MW
What is the average load for February in the annual load table? - ANS 6 MW
3 @COPYRIGHT THESTAR 2025/2026
, What is the average load for March in the annual load table? - ANS 4 MW
What is the average load for April in the annual load table? - ANS 2 MW
What is the average load for May in the annual load table? - ANS 6 MW
What is the average load for June in the annual load table? - ANS 12 MW
What is the average load for July in the annual load table? - ANS 16 MW
What is the average load for August in the annual load table? - ANS 14 MW
What is the average load for September in the annual load table? - ANS 10 MW
What is the average load for October in the annual load table? - ANS 4 MW
What is the average load for November in the annual load table? - ANS 6 MW
What is the average load for December in the annual load table? - ANS 8 MW
How do you calculate the total energy (W) in the MATLAB code provided? - ANS W = P' * Dt,
where P is the load and Dt is the demand interval.
What MATLAB command is used to calculate the average load (Pavg)? - ANS Pavg =
W/sum(Dt)
4 @COPYRIGHT THESTAR 2025/2026
SOLUTIONS MANUAL OVERVIEW.
EXAM 2025 QUESTIONS AND ANSWERS
What is the formula for estimating power demand growth? - ANS P = P0 * e^(a(t−t0)), where
a is the average per unit growth rate, P is the demand in year t, and P0 is the given demand at
year t0.
What was the peak power demand in the United States in 1984? - ANS 480 GW.
What was the average growth rate of peak power demand used in the estimation? - ANS 3.4
percent.
Using the given MATLAB commands, what is the predicted peak power demand for the year
1999? - ANS 799.3398 GW.
What MATLAB command is used to plot the predicted peak demand? - ANS plot(t, P), grid.
What does the variable P0 represent in the demand estimation formula? - ANS The given
demand at year t0.
1 @COPYRIGHT THESTAR 2025/2026
,What does the variable a represent in the demand estimation formula? - ANS The average
per unit growth rate.
What is the time range used for predicting peak demand from 1984 to 1999? - ANS From
year 1984 (t0 = 84) to year 1999 (t = 99).
What is the significance of the variable t in the demand estimation formula? - ANS It
represents the year for which the demand is being estimated.
What is the expected energy consumption growth in a certain country over 10 years? -
ANS It is expected to double.
What is the formula for exponential growth used in energy consumption estimation? - ANS P
= P0 * e^(at), where a is the growth rate.
What does the variable P represent in the energy consumption growth formula? - ANS The
energy consumption at time t.
What is the purpose of estimating peak power demand? - ANS It is the starting point for
planning future electric power supply.
What is the significance of the year 1984 in the context of the notes? - ANS It is the base year
for estimating future peak power demand.
What is the relationship between the variables P, P0, and a in the context of power demand? -
ANS P is the future demand, P0 is the current demand, and a is the growth rate affecting
how P changes over time.
What type of growth does the formula P = P0 * e^(at) represent? - ANS Exponential growth.
2 @COPYRIGHT THESTAR 2025/2026
,What is the expected outcome of the plot generated by the MATLAB commands? - ANS A
visual representation of the predicted peak power demand from 1984 to 1999.
How is the growth rate a calculated if energy consumption is expected to double in 10 years? -
ANS Using the formula P = P0 * e^(at) and solving for a.
What does the variable t0 represent in the demand estimation formula? - ANS The base year
from which the demand is measured.
What is the primary focus of Chapter 1 in the provided notes? - ANS Problems related to
power demand estimation and growth.
What is the role of MATLAB in the context of the notes? - ANS To plot and analyze the
predicted peak demand based on the given formulas.
What does the term 'e' represent in the exponential growth formulas? - ANS The base of the
natural logarithm, approximately equal to 2.71828.
What is the significance of the year range from 1984 to 1999 in the context of power demand? -
ANS It is the period over which the peak power demand is being predicted.
What is the formula for solving for 'a' in the equation ln 2 = 10a? - ANS a = 0.693
What is the average load for January in the annual load table? - ANS 8 MW
What is the average load for February in the annual load table? - ANS 6 MW
3 @COPYRIGHT THESTAR 2025/2026
, What is the average load for March in the annual load table? - ANS 4 MW
What is the average load for April in the annual load table? - ANS 2 MW
What is the average load for May in the annual load table? - ANS 6 MW
What is the average load for June in the annual load table? - ANS 12 MW
What is the average load for July in the annual load table? - ANS 16 MW
What is the average load for August in the annual load table? - ANS 14 MW
What is the average load for September in the annual load table? - ANS 10 MW
What is the average load for October in the annual load table? - ANS 4 MW
What is the average load for November in the annual load table? - ANS 6 MW
What is the average load for December in the annual load table? - ANS 8 MW
How do you calculate the total energy (W) in the MATLAB code provided? - ANS W = P' * Dt,
where P is the load and Dt is the demand interval.
What MATLAB command is used to calculate the average load (Pavg)? - ANS Pavg =
W/sum(Dt)
4 @COPYRIGHT THESTAR 2025/2026
