NEIEP 400 FINAL EXAM
REVIEWED QUESTIONS AND
CORRECT ANSWERS
Which is true when placing an ammeter into a circuit ?
The meter is placed in series with any component
Which of the following describes the most useful
feature of the clamp - on ammeter ?
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 ?
Capacitor
What must be done when testing a resistance to avoid
false readings caused by parallel circuit paths ?
Remove one of the two wires to the item being tested
A minus sign in front of a reading of the digital
voltmeter indicates which of the following ?
The positive lead is connected to the negative source
Which of the following statements best describes
CEMF ?
Opposes the applied voltage .
Refer to the figure . What will be the phase
relationship between the primary and secondary
voltages ?
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 ?
Isolation transformer
What is the power available from a 68 kVA transformer
connected in open delta configuration ?
39.44 kVA
The secondary winding of an 11,000 volt to 220 volt
transformer has 50 windings on the secondary How
many turns are on the primary winding ?
2500 turns
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 ?
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 ?
375 amps
Which statement best describes eddy currents ?
They are circulating currents set up by magnetic
induction .
With the following values : Ep = 208 VAC ; Es = 35
VAC ; Ip = 3.8 amps ; Is = 21.42 amps , what is the
efficiency of this transformer ?
95 %
Which of the following would describe a transformer
with a fixed voltage transformation ratio of 1:12 ?
Step - up transformer
REVIEWED QUESTIONS AND
CORRECT ANSWERS
Which is true when placing an ammeter into a circuit ?
The meter is placed in series with any component
Which of the following describes the most useful
feature of the clamp - on ammeter ?
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 ?
Capacitor
What must be done when testing a resistance to avoid
false readings caused by parallel circuit paths ?
Remove one of the two wires to the item being tested
A minus sign in front of a reading of the digital
voltmeter indicates which of the following ?
The positive lead is connected to the negative source
Which of the following statements best describes
CEMF ?
Opposes the applied voltage .
Refer to the figure . What will be the phase
relationship between the primary and secondary
voltages ?
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 ?
Isolation transformer
What is the power available from a 68 kVA transformer
connected in open delta configuration ?
39.44 kVA
The secondary winding of an 11,000 volt to 220 volt
transformer has 50 windings on the secondary How
many turns are on the primary winding ?
2500 turns
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 ?
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 ?
375 amps
Which statement best describes eddy currents ?
They are circulating currents set up by magnetic
induction .
With the following values : Ep = 208 VAC ; Es = 35
VAC ; Ip = 3.8 amps ; Is = 21.42 amps , what is the
efficiency of this transformer ?
95 %
Which of the following would describe a transformer
with a fixed voltage transformation ratio of 1:12 ?
Step - up transformer
