NEIEP 400 Final Review questions with verified
answers
A ____ generator's pole pieces become excited by residual magnetism . Ans✓✓✓
Self - excited
A light electrical load on a commutator causes which of the following conditions ?
Ans✓✓✓ Threading
A minus sign in front of a reading of the digital voltmeter indicates which of the
following ? Ans✓✓✓ The positive lead is connected to the negative source
A slinger ring is used to lubricate what type of bearing ? Ans✓✓✓ Sleeve
A transformer has 728 turns on the primary winding and 56 turns on the
secondary With 120 volts applied on the primary , what is the output voltage on
the secondary ? Ans✓✓✓ 9.23 volts
A transformer has a primary voltage of 440 V with 100 turns and a 15 : 1 voltage
ratio of transformation . With a primary current of 25 amps , what is the current
in the secondary ? Ans✓✓✓ 375 amps
An electromagnetic field in a generator is created by having current flow in the
___? Ans✓✓✓ Coils wound around the pole piece
How can an eccentric commutator be corrected ? Ans✓✓✓ Turning the
commutator with a lathe tool
, How is an armature shaft balanced at the factory or repair facility Ans✓✓✓
Adding or removing epoxy weights to the shaft or windings
How is motor speed changed ? Ans✓✓✓ By varying the field or armature voltage
How many pieces make up the shaft of a DC machine ? Ans✓✓✓ 1
If a current carrying wire is placed perpendicular to a field created by two
magnets of opposite polarity , what happens ? Ans✓✓✓ The conductor is moved
at a right angle to the flux from the magnetic poles
If a squirrel cage motor rotation is clockwise with ACB phase sequence and the
phase sequence ABC is applied , which statement is correct ? Ans✓✓✓ The
motor will run in the counterclockwise direction
In a DC series generator Ans✓✓✓ Current flows only when there is a load
In a separately - excited generator , where does field excitation current come
from ? Ans✓✓✓ An external power source
Mica is used as a / an ___? Ans✓✓✓ Insulator
More loops are added to the elementary DC generator armature in order to help
it do what ? Ans✓✓✓ Reduce ripple
Refer to the figure . What type of transformer is represented ? Ans✓✓✓ Core
type with a wye primary and delta secondary
answers
A ____ generator's pole pieces become excited by residual magnetism . Ans✓✓✓
Self - excited
A light electrical load on a commutator causes which of the following conditions ?
Ans✓✓✓ Threading
A minus sign in front of a reading of the digital voltmeter indicates which of the
following ? Ans✓✓✓ The positive lead is connected to the negative source
A slinger ring is used to lubricate what type of bearing ? Ans✓✓✓ Sleeve
A transformer has 728 turns on the primary winding and 56 turns on the
secondary With 120 volts applied on the primary , what is the output voltage on
the secondary ? Ans✓✓✓ 9.23 volts
A transformer has a primary voltage of 440 V with 100 turns and a 15 : 1 voltage
ratio of transformation . With a primary current of 25 amps , what is the current
in the secondary ? Ans✓✓✓ 375 amps
An electromagnetic field in a generator is created by having current flow in the
___? Ans✓✓✓ Coils wound around the pole piece
How can an eccentric commutator be corrected ? Ans✓✓✓ Turning the
commutator with a lathe tool
, How is an armature shaft balanced at the factory or repair facility Ans✓✓✓
Adding or removing epoxy weights to the shaft or windings
How is motor speed changed ? Ans✓✓✓ By varying the field or armature voltage
How many pieces make up the shaft of a DC machine ? Ans✓✓✓ 1
If a current carrying wire is placed perpendicular to a field created by two
magnets of opposite polarity , what happens ? Ans✓✓✓ The conductor is moved
at a right angle to the flux from the magnetic poles
If a squirrel cage motor rotation is clockwise with ACB phase sequence and the
phase sequence ABC is applied , which statement is correct ? Ans✓✓✓ The
motor will run in the counterclockwise direction
In a DC series generator Ans✓✓✓ Current flows only when there is a load
In a separately - excited generator , where does field excitation current come
from ? Ans✓✓✓ An external power source
Mica is used as a / an ___? Ans✓✓✓ Insulator
More loops are added to the elementary DC generator armature in order to help
it do what ? Ans✓✓✓ Reduce ripple
Refer to the figure . What type of transformer is represented ? Ans✓✓✓ Core
type with a wye primary and delta secondary
