EEE-360 MIDTERM EXAM 2 2026-FALL REVIEW SOLUTIONS ENERGY SYSTEMS AND POWER ELECTRONICS

EEE-360 MIDTERM EXAM 2 2026-FALL
REVIEW SOLUTIONS ENERGY SYSTEMS AND
POWER ELECTRONICS

Highlight=100; Red = -50; Blue = 50; Black = 25


1. For a given synchronous machine, corresponding to a stator
current value of 𝐼𝑠𝑡𝑎, the value of the armature reaction is
𝑋𝑎𝑟𝑚. For everything else remaining the same, if the stator
current now becomes 2 × 𝐼𝑠𝑡𝑎, what will be the new value of
armature reaction?
a. 𝑋𝑎𝑟𝑚
𝑋𝑎𝑟𝑚
b.
2



c. 2 × 𝑋𝑎𝑟𝑚
d. Cannot be determined

2. As the speed of an alternator increases:
a. the frequency increases
b. the frequency decreases
c. the frequency remains constant, but power factor
decreases
d. none of the above

3. The driving power from the prime mover driving the
alternator is lost but the alternator remains connected to the
supply network and the field supply also remains on. The
alternator will
a. get burnt

, b. behave as an induction motor but will rotate in the
opposite direction
c. behave as a synchronous motor and will rotate in the
same direction
d. behave as a synchronous motor but will rotate in a
reverse direction to that corresponding to generator
action

4. Maximum electric power output of a synchronous generator is:
a. 𝑋𝑠𝑦𝑛
𝐸𝑔𝑒𝑛𝑉𝑡
𝑉2
b. 𝑡
𝑋𝑠𝑦𝑛
2
c. 𝐸𝑔𝑒𝑛
𝐸𝑔𝑒𝑛𝑉𝑡
d.
𝑋𝑠𝑦𝑛

𝑋𝑠𝑦𝑛