ATT TEST 11 EXAM LATEST 2024 ACTUAL EXAM 100
QUESTIONS AND CORRECT DETAILED ANSWERS
|ALREADY GRADED A
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)
, ATT TEST 11 EXAM LATEST 2024 ACTUAL EXAM 100
QUESTIONS AND CORRECT DETAILED ANSWERS
|ALREADY GRADED A
How much CEMF is generated in locked motor
condition?ANSWER--None
What is the definition of one horsepower?ANSWER--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?ANSWER--
Attraction/repulsion
What are basic parts of a motor?ANSWER--Stator, armature
(rotor), brushes, commutator, shaft
At what points are max flux lines cut and peak volts
produced?ANSWER--When armature is parallel to lines of force
(90 and 270 degrees)
What are three types of DC generators?ANSWER--permanent
magnet, separately excited, self-excited
What are 3 types of DC motors?ANSWER--Series, shunt and
compound
What is the assumed value of K?ANSWER--1
QUESTIONS AND CORRECT DETAILED ANSWERS
|ALREADY GRADED A
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)
, ATT TEST 11 EXAM LATEST 2024 ACTUAL EXAM 100
QUESTIONS AND CORRECT DETAILED ANSWERS
|ALREADY GRADED A
How much CEMF is generated in locked motor
condition?ANSWER--None
What is the definition of one horsepower?ANSWER--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?ANSWER--
Attraction/repulsion
What are basic parts of a motor?ANSWER--Stator, armature
(rotor), brushes, commutator, shaft
At what points are max flux lines cut and peak volts
produced?ANSWER--When armature is parallel to lines of force
(90 and 270 degrees)
What are three types of DC generators?ANSWER--permanent
magnet, separately excited, self-excited
What are 3 types of DC motors?ANSWER--Series, shunt and
compound
What is the assumed value of K?ANSWER--1
