Exam (elaborations)
ATT Test 10: Questions And Verified Solutions
- Course
- Institution
ATT Test 10: Questions And Verified Solutions
[Show more]
Content preview
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.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller LeCrae. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75323 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now