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ATT Test 10: Questions And Verified Solutions
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ATT Test 10: Questions And Verified Solutions
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ATT Test 10: Questions And Verified SolutionsThis schematic represents what type of rotating machine? Right Ans -
Separately excited DC generator
How is a pulsating DC output eliminated in DC generators? Right Ans -
Using a multiple-loop armature
What part of a motor allows reversing the magnetic poles in the rotor?
Right Ans - Commutator and brushes
What principle of magnetism allows a generator to power its own stator
windings and still generate an output voltage? Right Ans - Retentivity
In a generator, when the armature rotation is parallel to the stator magnetic
field, what is the output voltage? Right Ans - zero
In the motor's voltage source circuit, what is the purpose of IC1? Right Ans
- Voltage regulator
In the motor's voltage source circuit, what is the purpose of R8? Right Ans -
Manual speed control
In the automatic speed control circuit, what happens to the frequency output
of ISO1 if the load on M2 increases? Right Ans - decrease
In the automatic speed control circuit, what happens to the output of U2 if the
load on M2 decreases? Right Ans - increase
During troubleshooting of a motor-generator set, if the set is not rotating,
what is the probable faulted area? Right Ans - Motor and motor circuits
What principle of magnetism allows the use of electromagnet stators?
Right Ans - Passing a current through a conductor produces a magnet
This schematic represents what type of rotating machine? Right Ans -
Series DC motor
,What principle of magnetism do motors operate on? Right Ans - Attraction
and repulsion
In the motor's voltage source circuit, what is the purpose of U1? Right Ans -
Difference amplifier
In a motor, it is important to know that the starting current _______ Right
Ans - is higher than the running current.
What principle of magnetism do generators operate on? Right Ans -
Passing a conductor through a magnetic field produces voltage
How do you troubleshoot an automatic speed control circuit in a motor-
generator set? Right Ans - Signal tracing circuits
What is the primary difference between a DC motor and DC generator?
Right Ans - 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? Right Ans -
Decreases
What principle of magnetism allows the use of electromagnet stators?
Right Ans - 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? Right Ans - None
In the revolving-field generator, there are no sliding contacts in the _______
Right Ans - AC output circuit.
In a Delta connected alternator, the line voltage equals the _______ Right Ans
- phase voltage
In three-phase alternators, the windings are connected in either a Wye or
_______ configuration. Right Ans - Delta
An AC generator is also known as a/an _______ Right Ans - alternator.
, The principle of _______ is used for all motors and generators Right Ans -
magnetism
In a Wye connected alternator, the line voltage is equal to _______ Right Ans
- phase voltage x 1.73
In balanced Wye loads, all the resistors are _______ Right Ans - equal
A single-phase alternator physically resembles a _______ Right Ans - single-
phase AC motor
In an AC generator, the output voltage across the load in the external circuit
reverses polarity with every _______ of rotation. Right Ans - 180°
CEMF opposes the _______ Right Ans - original conductor magnetic field.
applied voltage.
Which of the following best describes torque? Right Ans - Twisting action
Speed and torque are _______ Right Ans - inversely proportional.
One horsepower is the power rate corresponding to _______ Right Ans -
33,000 ft·lb/min.
What are the two basic components of a motor? Right Ans - Poles and
armature
What is motor efficiency? Right Ans - Ratio of output power to input power.
If a motor is supplied 2500 watts of electrical energy, how much horsepower
would it supply? Right Ans - 3.35 hp
Mechanical power is defined in terms of _______ Right Ans - horsepower.
Inefficiency means the _______ Right Ans - input is much greater than output.
100% efficiency means the _______ Right Ans - input power equals output
power.
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