NEIEP 400 UPDATED EXAM SCRIPT QUESTIONS AND
SOLUTIONS GRADED A+
✔✔In a DC motor, the brushes are connected to a DC voltage BLANK - ✔✔Source
✔✔The BLANK can determine which direction a current-carrying conductor will move in
a magnetic field. - ✔✔Right-hand rule
✔✔TRUE OR FALSE The elementary DC motor is constructed differently than a DC
generator. - ✔✔False
✔✔A BLANK changes mechanical energy to electrical energy. - ✔✔Generator
✔✔A BLANK changes electrical energy to mechanical energy. - ✔✔Motor
✔✔TRUE OR FALSE The same DC machine may operate as either a generator or a
motor. - ✔✔True
✔✔CRMF BLANK current flow in a rotating DC motor - ✔✔Limits
✔✔BLANK can affect the amount of CEMF produced - ✔✔Load
✔✔Lenz's Law states that an induced current is always in such a direction that its field
BLANK the action that produced it. - ✔✔Opposes
✔✔Lenz's Law explains the results of the magnetic field's attempt to correct BLANK
caused by conflicting fields. - ✔✔Distortion
✔✔The BLANK or BLANK on DC machines serves as the overall support. - ✔✔Frame
or Yoke
✔✔TRUE OR FALSE The main frame serves as a magnetic circuit path. - ✔✔True
✔✔TRUE OR FALSE Magnetic flux is only present in the field. - ✔✔False
✔✔Pole pieces are made of thin layers of iron or steel called BLANK - ✔✔Laminations
✔✔Field windings and pole pieces together are called the BLANK - ✔✔Field
✔✔TRUE OR FALSE Series field windings consist of many turns of fine wire. - ✔✔False
✔✔TRUE OR FALSE Shunt field windings consist of many turns of fine wire. - ✔✔True
, ✔✔TRUE OR FALSE A DC machine may have one or three poles. - ✔✔False
✔✔Two ways of connecting field windings are called BLANK and BLANK. - ✔✔Series;
Shunt
✔✔TRUE OR FALSE Interpoles can be added to increase armature reaction. -
✔✔False
✔✔The portion of the machine supporting the brush rigging is called the BLANK -
✔✔End bell
✔✔The commutator is part of the BLANK assembly. - ✔✔Armature
✔✔TRUE OR FALSE Cores are made from a solid piece of steel to provide better
magnetic circuit makeup. - ✔✔False
✔✔The laminations of the armature are slotted to hold the BLANK - ✔✔Armature
windings
✔✔TRUE OR FALSE Mica is used as a connector between commutator segments. -
✔✔False
✔✔TRUE OR FALSE The armature shaft is formed of one-piece construction. - ✔✔True
✔✔TRUE OR FALSE Any current flowing in the armature core is wasted. - ✔✔True
✔✔The use of BLANK reduces the magnitude of the eddy currents. - ✔✔Laminations
✔✔TRUE OR FALSE Armature windings are insulated. - ✔✔True
✔✔The commutator - ✔✔- Passes current between brushes and windings
- Provides switching
- Turns with the armature
✔✔TRUE OR FALSE The commutator is part of the armature assembly. - ✔✔True
✔✔The brushes ride on the BLANK - ✔✔Commutator
✔✔TRUE OR FALSE The spring tension on the brush arm is important. - ✔✔True
✔✔TRUE OR FALSE in a friction bearing, lubrication is optional. - ✔✔False
SOLUTIONS GRADED A+
✔✔In a DC motor, the brushes are connected to a DC voltage BLANK - ✔✔Source
✔✔The BLANK can determine which direction a current-carrying conductor will move in
a magnetic field. - ✔✔Right-hand rule
✔✔TRUE OR FALSE The elementary DC motor is constructed differently than a DC
generator. - ✔✔False
✔✔A BLANK changes mechanical energy to electrical energy. - ✔✔Generator
✔✔A BLANK changes electrical energy to mechanical energy. - ✔✔Motor
✔✔TRUE OR FALSE The same DC machine may operate as either a generator or a
motor. - ✔✔True
✔✔CRMF BLANK current flow in a rotating DC motor - ✔✔Limits
✔✔BLANK can affect the amount of CEMF produced - ✔✔Load
✔✔Lenz's Law states that an induced current is always in such a direction that its field
BLANK the action that produced it. - ✔✔Opposes
✔✔Lenz's Law explains the results of the magnetic field's attempt to correct BLANK
caused by conflicting fields. - ✔✔Distortion
✔✔The BLANK or BLANK on DC machines serves as the overall support. - ✔✔Frame
or Yoke
✔✔TRUE OR FALSE The main frame serves as a magnetic circuit path. - ✔✔True
✔✔TRUE OR FALSE Magnetic flux is only present in the field. - ✔✔False
✔✔Pole pieces are made of thin layers of iron or steel called BLANK - ✔✔Laminations
✔✔Field windings and pole pieces together are called the BLANK - ✔✔Field
✔✔TRUE OR FALSE Series field windings consist of many turns of fine wire. - ✔✔False
✔✔TRUE OR FALSE Shunt field windings consist of many turns of fine wire. - ✔✔True
, ✔✔TRUE OR FALSE A DC machine may have one or three poles. - ✔✔False
✔✔Two ways of connecting field windings are called BLANK and BLANK. - ✔✔Series;
Shunt
✔✔TRUE OR FALSE Interpoles can be added to increase armature reaction. -
✔✔False
✔✔The portion of the machine supporting the brush rigging is called the BLANK -
✔✔End bell
✔✔The commutator is part of the BLANK assembly. - ✔✔Armature
✔✔TRUE OR FALSE Cores are made from a solid piece of steel to provide better
magnetic circuit makeup. - ✔✔False
✔✔The laminations of the armature are slotted to hold the BLANK - ✔✔Armature
windings
✔✔TRUE OR FALSE Mica is used as a connector between commutator segments. -
✔✔False
✔✔TRUE OR FALSE The armature shaft is formed of one-piece construction. - ✔✔True
✔✔TRUE OR FALSE Any current flowing in the armature core is wasted. - ✔✔True
✔✔The use of BLANK reduces the magnitude of the eddy currents. - ✔✔Laminations
✔✔TRUE OR FALSE Armature windings are insulated. - ✔✔True
✔✔The commutator - ✔✔- Passes current between brushes and windings
- Provides switching
- Turns with the armature
✔✔TRUE OR FALSE The commutator is part of the armature assembly. - ✔✔True
✔✔The brushes ride on the BLANK - ✔✔Commutator
✔✔TRUE OR FALSE The spring tension on the brush arm is important. - ✔✔True
✔✔TRUE OR FALSE in a friction bearing, lubrication is optional. - ✔✔False
