Which of the following most correctly describes Compound generators?
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Uses a series and shunt field mounted on a common pole piece.
Which of the following would increase the amount of voltage produced by an
armature rotating through a magnetic field?
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Increase the number of armature turns.
Which material should be used for sitting brushes?
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Sandpaper
What does the symbol A~ on digital multimeter represent?
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AC current
What is percent of slip for a three-phase 60 HZ motor that has 4 poles that rotates at
1745 RPM?
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Formula - 60xHZ/(Numbers of pole/2)
60x60/(4/2)
3600/2=1800 RPM (Synchronous speed)
% formula - ((Synch speed - Actual rotation)/synch speed)x100
((1800-1745)/1800)x100
(55/1800)x100=0.0305x100=3.05%
, Before using a megger to test equipment, what should be done?
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Isolate the item from external circuits
What is the significance of the meter specification of ohms per volt?
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The ratio of supply voltage to resistance.
What elements make up a proper commutator film?
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Copper oxide, graphite film, graphite particles and water vapor.
refer to Figure 4. With the terminals connected in ACB sequence, what will be correct
current path and alignment of the magnetic field when the phases are in position 3?
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B
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Uses a series and shunt field mounted on a common pole piece.
Which of the following would increase the amount of voltage produced by an
armature rotating through a magnetic field?
,Give this one a try later!
Increase the number of armature turns.
Which material should be used for sitting brushes?
Give this one a try later!
Sandpaper
What does the symbol A~ on digital multimeter represent?
Give this one a try later!
AC current
What is percent of slip for a three-phase 60 HZ motor that has 4 poles that rotates at
1745 RPM?
Give this one a try later!
Formula - 60xHZ/(Numbers of pole/2)
60x60/(4/2)
3600/2=1800 RPM (Synchronous speed)
% formula - ((Synch speed - Actual rotation)/synch speed)x100
((1800-1745)/1800)x100
(55/1800)x100=0.0305x100=3.05%
, Before using a megger to test equipment, what should be done?
Give this one a try later!
Isolate the item from external circuits
What is the significance of the meter specification of ohms per volt?
Give this one a try later!
The ratio of supply voltage to resistance.
What elements make up a proper commutator film?
Give this one a try later!
Copper oxide, graphite film, graphite particles and water vapor.
refer to Figure 4. With the terminals connected in ACB sequence, what will be correct
current path and alignment of the magnetic field when the phases are in position 3?
Give this one a try later!
B
