Att test 10 Exam QUESTIONS AND CORRECT ANSWERS

Att test 10 Exam QUESTIONS AND
CORRECT ANSWERS
This schematic represents what type of rotating machine? - CORRECT ANSWER Separately
excited DC generator



How is a pulsating DC output eliminated in DC generators? - CORRECT ANSWER Using a
multiple-loop armature



What part of a motor allows reversing the magnetic poles in the rotor? - CORRECT
ANSWER Commutator and brushes



What principle of magnetism allows a generator to power its own stator windings and still generate an
output voltage? - CORRECT ANSWER Retentivity



In a generator, when the armature rotation is parallel to the stator magnetic field, what is the output
voltage? - CORRECT ANSWER zero



In the motor's voltage source circuit, what is the purpose of IC1? - CORRECT
ANSWER Voltage regulator



In the motor's voltage source circuit, what is the purpose of R8? - CORRECT
ANSWER Manual speed control



In the automatic speed control circuit, what happens to the frequency output of ISO1 if the load on
M2 increases? - CORRECT ANSWER decrease



In the automatic speed control circuit, what happens to the output of U2 if the load on M2 decreases?
- CORRECT ANSWER increase



During troubleshooting of a motor-generator set, if the set is not rotating, what is the probable faulted
area? - CORRECT ANSWER Motor and motor circuits

,What principle of magnetism allows the use of electromagnet stators? - CORRECT
ANSWER Passing a current through a conductor produces a magnet



This schematic represents what type of rotating machine? - CORRECT ANSWER Series DC
motor



What principle of magnetism do motors operate on? - CORRECT ANSWER Attraction and
repulsion



In the motor's voltage source circuit, what is the purpose of U1? - CORRECT
ANSWER Difference amplifier



In a motor, it is important to know that the starting current _______ - CORRECT ANSWER is
higher than the running current.



What principle of magnetism do generators operate on? - CORRECT ANSWER Passing a
conductor through a magnetic field produces voltage



How do you troubleshoot an automatic speed control circuit in a motor-generator set? - CORRECT
ANSWER Signal tracing circuits



What is the primary difference between a DC motor and DC generator? - CORRECT
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? - CORRECT ANSWER Decreases



What principle of magnetism allows the use of electromagnet stators? - CORRECT
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? - CORRECT ANSWER None

, In the revolving-field generator, there are no sliding contacts in the _______ - CORRECT
ANSWER AC output circuit.



In a Delta connected alternator, the line voltage equals the _______ - CORRECT
ANSWER phase voltage



In three-phase alternators, the windings are connected in either a Wye or _______ configuration. -
CORRECT ANSWER Delta



An AC generator is also known as a/an _______ - CORRECT ANSWER alternator.



The principle of _______ is used for all motors and generators - CORRECT
ANSWER magnetism



In a Wye connected alternator, the line voltage is equal to _______ - CORRECT
ANSWER phase voltage x 1.73



In balanced Wye loads, all the resistors are _______ - CORRECT ANSWER equal



A single-phase alternator physically resembles a _______ - CORRECT 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. - CORRECT ANSWER 180°



CEMF opposes the _______ - CORRECT ANSWER original conductor magnetic field.

applied voltage.



Which of the following best describes torque? - CORRECT ANSWER Twisting action



Speed and torque are _______ - CORRECT ANSWER inversely proportional.