ABSA 3rd Class Part A2 Power Engineering Practice Exam –
Chapters 1–15 EXAM LATEST 2026-2027 600 QUESTIONS AND
100% Verified ANSWERS
The most common type of industrial electrical generation is the _____________.
a. single phase
b. two phase
c. three phase
d. DC generators
e. AC motors - answer>>C
When you are synchronizing an electrical generator and the synchronizing lamps are dark, you _________.
a. should have higher voltage ratings than the line system
b. have lower voltage rating
c. have two or more lamps connected in parallel
d. should have colored glass
e. should have higher current ratings than the line system - answer>>A
Modern alternators consist of a rotor on which the AC voltage producing windings are placed and a rotating stator
on which a DC excitation winding is placed.
a. True
b. False - answer>>B
In the case of the single-phase alternator, the coil windings are connected in three different groups, one for each
phase.
a. True
b. False - answer>>B
An alternator is a ___________________.
,a. three phase AC converter
b. DC generator
c. wound rotor motor
d. AC generator
e. single phase AC converter - answer>>D
Alternators __________________________.
a. have AC excitation on the rotor
b. DC excitation voltage on the stator
c. have a rotating armature on which a DC excitation winding is placed
d. slip rings on the stator
e. split ring on the rotor - answer>>C
Salient pole rotors _________________________.
a. are used on high speed alternators
b. are used on alternators not exceeding 1800 rpm
c. require no maintenance
d. are used on only single phase generators
e. are used on only three phase generators - answer>>B
What is the most common frequency of AC generators in North America?
a. 40 hertz
b. 120 hertz
c. 110 hertz
d. 55 hertz
e. 60 hertz - answer>>E
The best method of synchronizing an alternator to a system is ____________________.
a. by using the synchroscope
,b. by using the dark lamp
c. by using one dark, and two bright rotating brushes
d. by using the phase indicator
e. by using all dark rotating brushes - answer>>A
Paralleling alternators require the following conditions:
1) It must be in phase with the system
2) The incoming alternator must be the same voltage as the system
3) Its phase sequence must be the same as the system
4) Alternator frequency and system frequency must be the same
a. 1, 3, 4
b. 1, 2, 3
c. 2, 3, 4
d. 1, 2, 4
e. 1, 2, 3, 4 - answer>>E
To take an alternator off the line in a system involving two or more alternators, the driving torque of the prime
mover of the alternator to be removed should be reduced until it is supplying no current to the busbars.
a. True
b. False - answer>>A
For paralleling alternators, the incoming alternator must be the same ___________ as the system voltage.
a. manufacturer
b. conductance
c. voltage
d. amperage - answer>>C
The most common type of rotor used in induction motors is the squirrel cage rotor.
a. True
, b. False - answer>>A
The stator of the induction motor is identical to that of the three-phase alternator.
a. True
b. False - answer>>A
Wound rotor induction motors ___________________.
a. require less maintenance than squirrel cage motors
b. are less complicated in construction than other motors
c. are more reliable
d. are not very reliable
e. are used to control speed - answer>>E
Synchronous motors ______________________________.
a. have a lagging power factor
b. depend on slip for its torque
c. are only single phase
d. can be run at a leading power factor
e. can be run at a lagging power factor - answer>>D
Synchronous motors _____________________________.
a. can be run at very high speeds
b. can be run as an alternator or a motor
c. are very expensive compared to other motors
d. do not require brushes or slip rings
e. are low speed machines - answer>>B
Synchronous motors _____________________________.
a. require DC power supply to the rotor
Chapters 1–15 EXAM LATEST 2026-2027 600 QUESTIONS AND
100% Verified ANSWERS
The most common type of industrial electrical generation is the _____________.
a. single phase
b. two phase
c. three phase
d. DC generators
e. AC motors - answer>>C
When you are synchronizing an electrical generator and the synchronizing lamps are dark, you _________.
a. should have higher voltage ratings than the line system
b. have lower voltage rating
c. have two or more lamps connected in parallel
d. should have colored glass
e. should have higher current ratings than the line system - answer>>A
Modern alternators consist of a rotor on which the AC voltage producing windings are placed and a rotating stator
on which a DC excitation winding is placed.
a. True
b. False - answer>>B
In the case of the single-phase alternator, the coil windings are connected in three different groups, one for each
phase.
a. True
b. False - answer>>B
An alternator is a ___________________.
,a. three phase AC converter
b. DC generator
c. wound rotor motor
d. AC generator
e. single phase AC converter - answer>>D
Alternators __________________________.
a. have AC excitation on the rotor
b. DC excitation voltage on the stator
c. have a rotating armature on which a DC excitation winding is placed
d. slip rings on the stator
e. split ring on the rotor - answer>>C
Salient pole rotors _________________________.
a. are used on high speed alternators
b. are used on alternators not exceeding 1800 rpm
c. require no maintenance
d. are used on only single phase generators
e. are used on only three phase generators - answer>>B
What is the most common frequency of AC generators in North America?
a. 40 hertz
b. 120 hertz
c. 110 hertz
d. 55 hertz
e. 60 hertz - answer>>E
The best method of synchronizing an alternator to a system is ____________________.
a. by using the synchroscope
,b. by using the dark lamp
c. by using one dark, and two bright rotating brushes
d. by using the phase indicator
e. by using all dark rotating brushes - answer>>A
Paralleling alternators require the following conditions:
1) It must be in phase with the system
2) The incoming alternator must be the same voltage as the system
3) Its phase sequence must be the same as the system
4) Alternator frequency and system frequency must be the same
a. 1, 3, 4
b. 1, 2, 3
c. 2, 3, 4
d. 1, 2, 4
e. 1, 2, 3, 4 - answer>>E
To take an alternator off the line in a system involving two or more alternators, the driving torque of the prime
mover of the alternator to be removed should be reduced until it is supplying no current to the busbars.
a. True
b. False - answer>>A
For paralleling alternators, the incoming alternator must be the same ___________ as the system voltage.
a. manufacturer
b. conductance
c. voltage
d. amperage - answer>>C
The most common type of rotor used in induction motors is the squirrel cage rotor.
a. True
, b. False - answer>>A
The stator of the induction motor is identical to that of the three-phase alternator.
a. True
b. False - answer>>A
Wound rotor induction motors ___________________.
a. require less maintenance than squirrel cage motors
b. are less complicated in construction than other motors
c. are more reliable
d. are not very reliable
e. are used to control speed - answer>>E
Synchronous motors ______________________________.
a. have a lagging power factor
b. depend on slip for its torque
c. are only single phase
d. can be run at a leading power factor
e. can be run at a lagging power factor - answer>>D
Synchronous motors _____________________________.
a. can be run at very high speeds
b. can be run as an alternator or a motor
c. are very expensive compared to other motors
d. do not require brushes or slip rings
e. are low speed machines - answer>>B
Synchronous motors _____________________________.
a. require DC power supply to the rotor
