This NEIEP 400 Final Exam (National Elevator Industry Educational Program) evaluates an
apprentice's core knowledge of DC machinery, electrical circuits, and advanced diagnostic meters.
This multiple Expert-generated Stuy set for this exam, the curriculum focuses heavily on
transformers, DC motors/generators, and circuit troubleshooting math.
Sample critical core concepts and verified exam question types are detailed below:
Transformer Math & Ratios
A large segment of the exam requires calculating turns, voltages, and currents using inverse
transformation ratios:
• Turns & Output: A transformer with 728 primary turns, 56 secondary turns, and 120V
applied yields a secondary output of 9.23 volts.
• Current and Voltage Ratios: Current transformation ratios operate as the exact
opposite (inverse) of voltage ratios.
• Step-Up vs. Step-Down: A fixed voltage transformation ratio of 1:12 is a Step-up
transformer; conversely, a transformer going from 27 primary amps to 1 secondary amp
is a step-down transformer.
• Efficiency Formulas: Calculated by comparing secondary power output (\(E_s \times
I_s\)) against primary power input (\(E_p \times I_p\)).
DC Generators & Motors
You must understand how current, magnetism, and counter-electromotive force (CEMF) interact
within a DC machine:
• Field Excitation: In a separately excited generator, field excitation current is drawn
exclusively from an external power source.
• Series Generators: Current will only flow in a DC series generator when a load is
present.
1
, • Compounding: An elevator that runs faster in the up direction fully loaded than it does
empty is over-compounded.
• Dynamic Braking: Uses CEMF of a turning armature to oppose rotation, transforming
the motor into a generator to stop.
• Waste Currents: Armature and field piece core materials suffer from Eddy Currents,
which are mitigated by using laminated cores instead of solid steel.
Quiz_________________?
.250 MΩ indicates? -
ANSWER✅
250,000 MΩ
Quiz_________________?
0 on voltmeter when testing a known power source indicates? -
ANSWER✅
Internal fuse is blown
Quiz_________________?
0.790 MΩ indicates? -
ANSWER✅
790 kΩ
Quiz_________________?
2230Ω can also be expressed as? -
ANSWER✅
2
, 2.23 kΩ
Quiz_________________?
a 1:12 fixed voltage transformation ratio transformer is? -
ANSWER✅
Step-up
Quiz_________________?
A machine that converts mechanical energy into electrical energy -
ANSWER✅
Generator
Quiz_________________?
A meter is essentially a short circuit when connected to read? -
ANSWER✅
Current
Quiz_________________?
A shunt generators output drops as load is? -
ANSWER✅
Increased
Quiz_________________?
3
apprentice's core knowledge of DC machinery, electrical circuits, and advanced diagnostic meters.
This multiple Expert-generated Stuy set for this exam, the curriculum focuses heavily on
transformers, DC motors/generators, and circuit troubleshooting math.
Sample critical core concepts and verified exam question types are detailed below:
Transformer Math & Ratios
A large segment of the exam requires calculating turns, voltages, and currents using inverse
transformation ratios:
• Turns & Output: A transformer with 728 primary turns, 56 secondary turns, and 120V
applied yields a secondary output of 9.23 volts.
• Current and Voltage Ratios: Current transformation ratios operate as the exact
opposite (inverse) of voltage ratios.
• Step-Up vs. Step-Down: A fixed voltage transformation ratio of 1:12 is a Step-up
transformer; conversely, a transformer going from 27 primary amps to 1 secondary amp
is a step-down transformer.
• Efficiency Formulas: Calculated by comparing secondary power output (\(E_s \times
I_s\)) against primary power input (\(E_p \times I_p\)).
DC Generators & Motors
You must understand how current, magnetism, and counter-electromotive force (CEMF) interact
within a DC machine:
• Field Excitation: In a separately excited generator, field excitation current is drawn
exclusively from an external power source.
• Series Generators: Current will only flow in a DC series generator when a load is
present.
1
, • Compounding: An elevator that runs faster in the up direction fully loaded than it does
empty is over-compounded.
• Dynamic Braking: Uses CEMF of a turning armature to oppose rotation, transforming
the motor into a generator to stop.
• Waste Currents: Armature and field piece core materials suffer from Eddy Currents,
which are mitigated by using laminated cores instead of solid steel.
Quiz_________________?
.250 MΩ indicates? -
ANSWER✅
250,000 MΩ
Quiz_________________?
0 on voltmeter when testing a known power source indicates? -
ANSWER✅
Internal fuse is blown
Quiz_________________?
0.790 MΩ indicates? -
ANSWER✅
790 kΩ
Quiz_________________?
2230Ω can also be expressed as? -
ANSWER✅
2
, 2.23 kΩ
Quiz_________________?
a 1:12 fixed voltage transformation ratio transformer is? -
ANSWER✅
Step-up
Quiz_________________?
A machine that converts mechanical energy into electrical energy -
ANSWER✅
Generator
Quiz_________________?
A meter is essentially a short circuit when connected to read? -
ANSWER✅
Current
Quiz_________________?
A shunt generators output drops as load is? -
ANSWER✅
Increased
Quiz_________________?
3
