ATT TEST 10 EXAM QUESTIONS AND CORRECT
ANSWERS WITH RATIONALES| GUARANTEED PASS
This schematic represents what type of rotating machine? - ANSWER:-Separately excited DC generator
How is a pulsating DC output eliminated in DC generators? - ANSWER:-Using a multiple-loop armature
What part of a motor allows reversing the magnetic poles in the rotor? - ANSWER:-Commutator and
brushes
What principle of magnetism allows a generator to power its own stator windings and still generate an
output voltage? - ANSWER:-Retentivity
In a generator, when the armature rotation is parallel to the stator magnetic field, what is the output
voltage? - ANSWER:-zero
In the motor's voltage source circuit, what is the purpose of IC1? - ANSWER:-Voltage regulator
In the motor's voltage source circuit, what is the purpose of R8? - ANSWER:-Manual speed control
In the automatic speed control circuit, what happens to the frequency output of ISO1 if the load on M2
increases? - ANSWER:-decrease
In the automatic speed control circuit, what happens to the output of U2 if the load on M2 decreases? -
ANSWER:-increase
During troubleshooting of a motor-generator set, if the set is not rotating, what is the probable faulted
area? - ANSWER:-Motor and motor circuits
,What principle of magnetism allows the use of electromagnet stators? - ANSWER:-Passing a current
through a conductor produces a magnet
This schematic represents what type of rotating machine? - ANSWER:-Series DC motor
What principle of magnetism do motors operate on? - ANSWER:-Attraction and repulsion
In the motor's voltage source circuit, what is the purpose of U1? - ANSWER:-Difference amplifier
In a motor, it is important to know that the starting current - ANSWER:-is higher than the
running current.
What principle of magnetism do generators operate on? - ANSWER:-Passing a conductor through a
magnetic field produces voltage
How do you troubleshoot an automatic speed control circuit in a motor-generator set? - ANSWER:-
Signal tracing circuits
What is the primary difference between a DC motor and DC generator? - ANSWER:-The power source
to the rotor is replaced in a generator with a load.
In U1, if the non-inverting input voltage remains constant and the inverting input voltage increases,
what happens to the output voltage? - ANSWER:-Decreases
What principle of magnetism allows the use of electromagnet stators? - ANSWER:-Passing a current
through a conductor produces a magnet
What level of voltage is produced in an AC generator when the armature movement is parallel to the
stator field? - ANSWER:-None
In the revolving-field generator, there are no sliding contacts in the - ANSWER:-AC output
circuit.
, In a Delta connected alternator, the line voltage equals the - ANSWER:-phase voltage
In three-phase alternators, the windings are connected in either a Wye or configuration. -
ANSWER:-Delta
An AC generator is also known as a/an - ANSWER:-alternator.
The principle of is used for all motors and generators - ANSWER:-magnetism
In a Wye connected alternator, the line voltage is equal to - ANSWER:-phase voltage x 1.73
In balanced Wye loads, all the resistors are - ANSWER:-equal
A single-phase alternator physically resembles a - ANSWER:-single-phase AC motor
In an AC generator, the output voltage across the load in the external circuit reverses polarity with every
of rotation. - ANSWER:-180°
CEMF opposes the - ANSWER:-original conductor magnetic
field. applied voltage.
Which of the following best describes torque? - ANSWER:-Twisting action
Speed and torque are - ANSWER:-inversely proportional.
One horsepower is the power rate corresponding to - ANSWER:-33,000 ft·lb/min.
What are the two basic components of a motor? - ANSWER:-Poles and armature
ANSWERS WITH RATIONALES| GUARANTEED PASS
This schematic represents what type of rotating machine? - ANSWER:-Separately excited DC generator
How is a pulsating DC output eliminated in DC generators? - ANSWER:-Using a multiple-loop armature
What part of a motor allows reversing the magnetic poles in the rotor? - ANSWER:-Commutator and
brushes
What principle of magnetism allows a generator to power its own stator windings and still generate an
output voltage? - ANSWER:-Retentivity
In a generator, when the armature rotation is parallel to the stator magnetic field, what is the output
voltage? - ANSWER:-zero
In the motor's voltage source circuit, what is the purpose of IC1? - ANSWER:-Voltage regulator
In the motor's voltage source circuit, what is the purpose of R8? - ANSWER:-Manual speed control
In the automatic speed control circuit, what happens to the frequency output of ISO1 if the load on M2
increases? - ANSWER:-decrease
In the automatic speed control circuit, what happens to the output of U2 if the load on M2 decreases? -
ANSWER:-increase
During troubleshooting of a motor-generator set, if the set is not rotating, what is the probable faulted
area? - ANSWER:-Motor and motor circuits
,What principle of magnetism allows the use of electromagnet stators? - ANSWER:-Passing a current
through a conductor produces a magnet
This schematic represents what type of rotating machine? - ANSWER:-Series DC motor
What principle of magnetism do motors operate on? - ANSWER:-Attraction and repulsion
In the motor's voltage source circuit, what is the purpose of U1? - ANSWER:-Difference amplifier
In a motor, it is important to know that the starting current - ANSWER:-is higher than the
running current.
What principle of magnetism do generators operate on? - ANSWER:-Passing a conductor through a
magnetic field produces voltage
How do you troubleshoot an automatic speed control circuit in a motor-generator set? - ANSWER:-
Signal tracing circuits
What is the primary difference between a DC motor and DC generator? - ANSWER:-The power source
to the rotor is replaced in a generator with a load.
In U1, if the non-inverting input voltage remains constant and the inverting input voltage increases,
what happens to the output voltage? - ANSWER:-Decreases
What principle of magnetism allows the use of electromagnet stators? - ANSWER:-Passing a current
through a conductor produces a magnet
What level of voltage is produced in an AC generator when the armature movement is parallel to the
stator field? - ANSWER:-None
In the revolving-field generator, there are no sliding contacts in the - ANSWER:-AC output
circuit.
, In a Delta connected alternator, the line voltage equals the - ANSWER:-phase voltage
In three-phase alternators, the windings are connected in either a Wye or configuration. -
ANSWER:-Delta
An AC generator is also known as a/an - ANSWER:-alternator.
The principle of is used for all motors and generators - ANSWER:-magnetism
In a Wye connected alternator, the line voltage is equal to - ANSWER:-phase voltage x 1.73
In balanced Wye loads, all the resistors are - ANSWER:-equal
A single-phase alternator physically resembles a - ANSWER:-single-phase AC motor
In an AC generator, the output voltage across the load in the external circuit reverses polarity with every
of rotation. - ANSWER:-180°
CEMF opposes the - ANSWER:-original conductor magnetic
field. applied voltage.
Which of the following best describes torque? - ANSWER:-Twisting action
Speed and torque are - ANSWER:-inversely proportional.
One horsepower is the power rate corresponding to - ANSWER:-33,000 ft·lb/min.
What are the two basic components of a motor? - ANSWER:-Poles and armature
