ATT COMPLETE EXAM REVIEW WITH FULL
SOLUTIONS
●● What is a generator
Answer: a device that converts mechanical energy into electrical energy
●● What is an incremental motor
Answer: a motor whose shaft rotates a specific distance in degrees
●● What is a continuous motor
Answer: one whose shaft continuously rotates without interruption when
input is applied
●● What type of generator produces DC volts and uses a commutator?
Answer: Dynamo
●● Motors and generators operate on what principle?
Answer: Electromagnetism
●● What characteristic describes how fast shaft rotates and is measured
in RPM/RPS?
Answer: Speed
,●● What characteristic is a twisting force that causes shaft to rotate?
Answer: Torque
●● How is torque calculated in generators?
Answer: Force X Distance from center of shaft
●● How are torque and speed related?
Answer: Inversely proportional
●● What characteristic is a generated voltage that OPPOSES applied
volts?
Answer: Couterelectromotive Force (CEMF)
●● How is CEMF produced?
Answer: By the rotation of motors shaft
●● How is CEMF related to speed and torque?
Answer: CEMF is proportional to speed and inversely proportional to
torque
●● What are loads?
, Answer: items that require motion and are driven by rotating shaft
(motors) and electrical circuits that require power (generators)
●● How are loads related to speed?
Answer: Inversely proportional
●● What characteristic is the amount of work accomplished?
Answer: power
●● How is power calculated in motors?
Answer: torque X RPM X K
●● How is power measured?
Answer: Watts and HP
●● How is power related to load and speed?
Answer: Proportional to load and inversely proportional to speed
●● When is torque greatest?
Answer: When RPM is 0 (locked motor)
●● How much CEMF is generated in locked motor condition?
SOLUTIONS
●● What is a generator
Answer: a device that converts mechanical energy into electrical energy
●● What is an incremental motor
Answer: a motor whose shaft rotates a specific distance in degrees
●● What is a continuous motor
Answer: one whose shaft continuously rotates without interruption when
input is applied
●● What type of generator produces DC volts and uses a commutator?
Answer: Dynamo
●● Motors and generators operate on what principle?
Answer: Electromagnetism
●● What characteristic describes how fast shaft rotates and is measured
in RPM/RPS?
Answer: Speed
,●● What characteristic is a twisting force that causes shaft to rotate?
Answer: Torque
●● How is torque calculated in generators?
Answer: Force X Distance from center of shaft
●● How are torque and speed related?
Answer: Inversely proportional
●● What characteristic is a generated voltage that OPPOSES applied
volts?
Answer: Couterelectromotive Force (CEMF)
●● How is CEMF produced?
Answer: By the rotation of motors shaft
●● How is CEMF related to speed and torque?
Answer: CEMF is proportional to speed and inversely proportional to
torque
●● What are loads?
, Answer: items that require motion and are driven by rotating shaft
(motors) and electrical circuits that require power (generators)
●● How are loads related to speed?
Answer: Inversely proportional
●● What characteristic is the amount of work accomplished?
Answer: power
●● How is power calculated in motors?
Answer: torque X RPM X K
●● How is power measured?
Answer: Watts and HP
●● How is power related to load and speed?
Answer: Proportional to load and inversely proportional to speed
●● When is torque greatest?
Answer: When RPM is 0 (locked motor)
●● How much CEMF is generated in locked motor condition?
