NEIEP 400 Final Exam (Latest 2023/ 2024 Update) 150 Questions and Verified Answers| 100% Correct| Grade A
What kind of meter would you use to detect a ground in the armature coils? - ...ANSWER...Ohmmeter
When should lubrication of motor bearings be done? - ...ANSWER...Not running
What would be the result if a meter set to current and connected to a voltage source? - ...ANSWER...Blow fuse
When commutation is good, what color is the commutator? - ...ANSWER...Chocolate
What is a precision shunt used for measuring? - ...ANSWER...Current
On a reversible D.C. door operator motor, what angle is the brush mounted? - ...ANSWER...Radially, straight up and down
What is the significance of the meter specification of ohms per volt? - ...ANSWER...Internal resistance at specific voltage
On the resistance scale of a digital meter, what does the lazy 8 symbol signify? - ...ANSWER...Infinity
When some of the generator output is used to supply the field current how is the generator described? - ...ANSWER...Self- exciting
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When the multimeter is set to amps position the test leads are considered to be in what state? - ...ANSWER...Short circuit
What should resistance of an armature be when measured from commutator to ground with brushes removed? - ...ANSWER...High resistance
What method of armature winding is used for high current applications? - ...ANSWER...lap winding
What should always be done to protect the meter from damage when measuring unknown voltage? - ...ANSWER...Set to the highest range
To what scale should the ammeter be set in order to read a current of 2000 ma? - ...ANSWER...10 amp
What must be done when testing a resistance to avoid readings caused by parallel circuit paths? - ...ANSWER...Remove one or two of the wire to the item being tested
0.790 MΩ indicates? - ...ANSWER...790 kΩ
AC voltage on a voltmeter is always indicated as? -
...ANSWER...RMS
- on voltmeter when testing a known power source indicates? -
...ANSWER...Internal fuse is blown
.250 MΩ indicates? - ...ANSWER...250,000 MΩ
What should resistance of a motor or generator commutator be to ground with the brushes raised? - ...ANSWER...Infinite Resistance
2230Ω can also be expressed as? - ...ANSWER...2.23 kΩ
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Applied voltage on the primary leads current by? -
...ANSWER...90°
CEMF can best be described as? - ...ANSWER...Opposes applied voltage
Eddy currents can be described as? - ...ANSWER...Circulating currents set up by magnetic induction
a 1:12 fixed voltage transformation ratio transformer is? -
...ANSWER...Step-up
How would you check for an open primary winding? - ...ANSWER...Measure resistance across the primary
If the secondary winding is open what will happen to the secondary resistance? - ...ANSWER...It will be infinity
When the secondary winding is completely shorted what happens to primary current? - ...ANSWER...Current is high
How can you reduce ripple? - ...ANSWER...More coils and commutator segments
If current carrying wire is placed perpendicular to a field by two magnets of opposite polarity what happens? - ...ANSWER...Conductor is moved at right angles to the flux from the magnetic poles
Inherent current-limiter present for a rotating armature? -
...ANSWER...CEMF
Elementary AC generator has what that DC doesn't? - ...ANSWER...Split rings
What provides the connection for the ends of the armature coils to the commutator? - ...ANSWER...Riser
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