NEIEP 400 FINAL EXAM REVIEW TEST

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NEIEP 400 FINAL EXAM 2024/2025 REVIEW TEST

BANK WITH 200 EXAM QUESTIONS AND CORRECT

ANSWERS (100% CORRECT ANSWERS) NEIEP 400

FINAL EXAM REAL PRACTICE QUESTIONS AND

ANSWERS (BRAND NEW!!)

1.which statement is correct regarding the Transformer - ANSWER-applied voltage on the primary leads current by 90 degrees

• refer to Figure 1 what does the schematic symbol represent - ANSWER-iron

core Transformer

• which of the following statements best describes CEMF - ANSWER-opposes

the applied voltage

• Refer to the figure . What will be the phase relationship between the primary and

secondary voltages ? - ANSWER-The secondary voltage will be 180 ° out of phase

• which type of Transformer would be used to prevent noise from being fed back

to the line without changing the voltage levels - ANSWER-isolation Transformer

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• what is the power of available from a 68 Kva transformer connected in open

Delta configuration - ANSWER-39.44 Kva

• the secondary winding of a 11000 volt to 220 volt transformer has 50 windings

on the secondary how many turns are on the primary winding - ANSWER-2500 turns

• a Transformer has 728 turns on the primary winding and 56 turns on the

secondary with the hundred twenty volt applied on the primary what is the output voltage of the secondary - ANSWER-9.23 volts

• which statement is correct regarding current and Transformers - ANSWER-the

current ratio of transformation is the opposite of the voltage ratio of transformation

• a Transformer has a primary voltage of 440 volts with 100 turns and a 15 to

one voltage ratio transformation with a primary current of 25 amps what will be the current in the secondary - ANSWER-375 amps

• which statement best describes Eddy currents - ANSWER-they are circulating

currents set up by magnetic induction

• which of the following values Ep=208vac Es=35vac Ip=3.8amps

Is=21.42amps, what is the efficiency of this transformer - ANSWER-95%

• which of the following would describe a Transformer with a fixed voltage

transformation ratio of 1 to 12 - ANSWER-Step up Transformer

• What must be done when testing a resistance to avoid false readings caused by

parallel circuit paths ? - ANSWER-Remove one of the two wires to the item being tested 2 / 4

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• which statement is correct regarding Transformers - ANSWER-the primary

winding terminals are identified with the letter h

• refer to figure 3 what type of Transformer is represented - ANSWER-core type

with a Y Primary in a Delta secondary

• which would you do to check for an Open Primary winding - ANSWER-

measure the resistance across the primary

• which statement applies when a secondary winding is open - ANSWER-the

secondary resistant will be infinite

• which statement applies when a secondary winding is completely shorted -

ANSWER-current through the primary is high

• which statement applies when a secondary winding is partially shorted -

ANSWER-current through the secondary is low

• refer to schematic and figure to what will be the phase relationship between the

primary and the secondary voltages - ANSWER-the secondary voltage will be a hundred eighty degrees out of phase

Which is true when placing an ammeter into a circuit ? - ANSWER-The meter is placed in series with any component

Refer to the figure . What type of transformer is represented ? - ANSWER-Core type with a wye primary and delta secondary 3 / 4

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Which of the following describes the most useful feature of the clamp - on ammeter ? - ANSWER-Does not require that connections be disturbed

Which of the following devices is an example of a reactive component that can store energy for long periods of time causing an electrical hazard even with power removed ? - ANSWER-Capacitor

A minus sign in front of a reading of the digital voltmeter indicates which of the following ? - ANSWER-The positive lead is connected to the negative source

Which of the following statements best describes CEMF ? - ANSWER-Opposes the applied voltage .

Which type of transformer would be used to prevent noise from being fed back to the line without changing the voltage levels ? - ANSWER-Isolation transformer

What is the power available from a 68 kVA transformer connected in open delta configuration ? - ANSWER-39.44 kVA

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