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ATT Test 11 - Questions And Answers (100% Correct)
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ATT Test 11 - Questions And Answers (100% Correct)
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ATT Test 11 - Questions And Answers (100% Correct)What is a motor Right Ans - a device that converts electrical energy into
mechanical energy
What is a generator Right Ans - a device that converts mechanical energy
into electrical energy
What is an incremental motor Right Ans - a motor whose shaft rotates a
specific distance in degrees
What is a continuous motor Right Ans - one whose shaft continuously
rotates without interruption when input is applied
What type of generator produces DC volts and uses a commutator? Right
Ans - Dynamo
Motors and generators operate on what principle? Right Ans -
Electromagnetism
What characteristic describes how fast shaft rotates and is measured in
RPM/RPS? Right Ans - Speed
What characteristic is a twisting force that causes shaft to rotate? Right Ans
- Torque
How is torque calculated in generators? Right Ans - Force X Distance from
center of shaft
How are torque and speed related? Right Ans - Inversely proportional
What characteristic is a generated voltage that OPPOSES applied volts?
Right Ans - Couterelectromotive Force (CEMF)
How is CEMF produced? Right Ans - By the rotation of motors shaft
How is CEMF related to speed and torque? Right Ans - CEMF is
proportional to speed and inversely proportional to torque
, What are loads? Right Ans - items that require motion and are driven by
rotating shaft (motors) and electrical circuits that require power (generators)
How are loads related to speed? Right Ans - Inversely proportional
What characteristic is the amount of work accomplished? Right Ans -
power
How is power calculated in motors? Right Ans - torque X RPM X K
How is power measured? Right Ans - Watts and HP
How is power related to load and speed? Right Ans - Proportional to load
and inversely proportional to speed
When is torque greatest? Right Ans - When RPM is 0 (locked motor)
How much CEMF is generated in locked motor condition? Right Ans - None
What is the definition of one horsepower? Right Ans - Power needed to lift
550 lbs 1 foot in one second or (33000 lbs in one minute)
What principle of magnetism do motors operate on? Right Ans -
Attraction/repulsion
What are basic parts of a motor? Right Ans - Stator, armature (rotor),
brushes, commutator, shaft
At what points are max flux lines cut and peak volts produced? Right Ans -
When armature is parallel to lines of force (90 and 270 degrees)
What are three types of DC generators? Right Ans - permanent magnet,
separately excited, self-excited
What are 3 types of DC motors? Right Ans - Series, shunt and compound
What is the assumed value of K? Right Ans - 1
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