Alternating Current
Alternating Current
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Question 1 |
How does alternating current get its name?
A | Alternating current uses different paths for electron flow. |
B | Alternating current constantly changes direction in a circuit |
C | An alternating current circuit has a constant voltage fluctuation |
D | An alternating current circuit has a magnetic field when it flows through a circuit |
Question 2 |
How is alternating current generated?
A | By coiling a wire around an iron core |
B | By moving current through a conductor |
C | By moving a conductor through a magnetic field |
D | By moving a conductor near an iron core |
Question 3 |
What determines the frequency in an AC circuit?
A | The amount of cycles that occur in a circuit in one second |
B | The amount of current that flows from a given source |
C | The force of a generator that is being used |
D | The speed of a generator divided by four |
Question 4 |
Frequency is measured in
A | Henrys |
B | Reactance |
C | Farads |
D | Hertz |
Question 5 |
What is the resistance of the passing of magnetic flux lines through a substance called?
A | Inductance |
B | Impedance |
C | Reluctance |
D | Inductive reactance |
Question 6 |
What is the ability to store electrons in an electrical circuit called?
A | Inductance |
B | Capacitance |
C | Reluctance |
D | Impedance |
Question 7 |
What is the resistance in an AC circuit due to change of current flow called?
A | Reactance |
B | Impedance |
C | Reluctance |
D | Inductance |
Question 8 |
What is the opposition to change in voltage in an AC capacitive circuit called
A | Capacitive reactance |
B | Capacitance |
C | Impedance |
D | Reactance |
Question 9 |
What is the generation of a voltage by the variance of the current flow rate in an AC circuit called?
A | Reactance |
B | Capacitance |
C | Impedance |
D | Inductance |
Question 10 |
What is the opposition to current flow in an AC inductive caused by magnetic lines of flux called?
A | Inductance |
B | Impedance |
C | Inductive reactance |
D | Reactance |
Question 11 |
What is the total resistance of an AC circuit that is caused by inductive reactance, resistance and capacitive reactance called?
A | Inductance |
B | Impedance |
C | Reactance |
D | Reluctance |
Question 12 |
What is the relationship of current and voltage in an inductive circuit?
A | Voltage leads current |
B | Current leads voltage |
C | Voltage is in phase with current |
D | There is no relationship |
Question 13 |
What is the relationship of current and voltage in a capacitive circuit?
A | Voltage leads current |
B | Current leads voltage |
C | Voltage is in phase with current |
D | There is no relationship |
Question 14 |
What is the relationship of current and voltage in a resistive circuit?
A | Voltage leads current |
B | Current leads voltage |
C | Voltage is in phase with current |
D | There is no relationship |
Question 15 |
One complete sine wave represents
A | The force of an AC circuit |
B | The action of a magnetic flux lines in an AC circuit |
C | A complete cycle of a generator |
D | The direction of the current through a conductor |
Question 16 |
If the current of an AC circuit changes direction 100 times in 1 second, the frequency of the power source is
A | 100Hz |
B | 200Hz |
C | 60Hz |
D | 50Hz |
Question 17 |
On a 120 volt, 60 Hz power supply, what leg must be fused?
A | The hot leg |
B | The neutral leg |
C | The hot and neutral leg |
D | In one hot leg and one neutral leg |
Question 18 |
On a 240v, 60Hz single phase power supply, where is a fuse necessary?
A | In one hot leg |
B | In both hot legs |
C | In both hot legs and a neutral leg |
D | In one hot leg and one neutral leg |
Question 19 |
When placing a voltmeter across two hot legs of a 240v three phase power supply, what voltage should be present?
A | 120 volts |
B | 480 volts |
C | 240 volts |
D | . 277 volts |
Question 20 |
How many degrees are any two hot legs of a three phase electrical system out of phase with each other?
A | 90 degrees |
B | 100 degrees |
C | 120 degrees |
D | 360 degrees |
Question 21 |
On a three phase power supply, what legs must be fused
A | L1, L2, and neutral |
B | L1, L2, and L3 |
C | L1, L3, and neutral |
D | T1, T2, and T3 |
Question 22 |
The condition indicating the direction of electron flow is known as
A | Current direction |
B | Voltage direction |
C | Flux condition |
D | Polarity |
Question 23 |
On a 120v power supply, what color of wire is the hot leg?
A | White |
B | Black |
C | Red |
D | Green |
Question 24 |
On a 120v power supply, what color of wire is the neutral leg?
A | White |
B | Black |
C | Red |
D | Green |
Question 25 |
On a 120v power supply, what color of wire is the grounded leg?
A | White |
B | Black |
C | Red |
D | Green |
Question 26 |
The purpose of connecting a ground wire to a load is to
A | Allow a secondary path for electrons during normal conditions |
B | Protect the equipment against short circuits |
C | Protect the equipment against an electrical short to ground |
D | Allow a secondary path for electrons during a grounded condition |
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