qhotti
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In a DC circuit, what limits current flow?
a.
Eddy currents
b.
The reactance of the circuit
c.
The resistance of the circuit
d.
Skin effect
The correct answer is: The resistance of the circuit
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What is the opposition to current flow in an AC circuit caused by an inductor called?
a.
inductance
b.
Inductive reactance
c.
Inductive resistance
d.
Skin effect
The correct answer is: Inductive reactance
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Complete the following statements by dragging the appropriate term at the bottom to the space next to it.
The symbol for inductance is ?
Inductance is measured in ?
The symbol for inductive reactance is ?
Inductive reactance is measured in ?
Possible Answers
XL
Ohms
Henries
L
L
Henries
XL
Ohms
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Give the formula used to calculate inductive reactance.
a.
XL = π x F x R
b.
XL = 2πFH
c.
XL = 2πfL
d.
XL = 2πHL
The correct answer is: XL = 2πfL
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The reactance of an inductive circuit depends upon the resistance of the coil and the frequency of the
circuit.
Select one:
True
False
The correct answer is 'False'.
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Inductive reactance causes current to lag the voltage by ? .
a.
60°
b.
90°
c.
180°
d.
270°
The correct answer is: 90°
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Complete the following statements.
If the frequency increases, the inductive reactance ? .
If the inductance is increased, the inductive reactance ? .
Possible answers
increases
decreases
increases
increases
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A manufacturer could produce a coil (inductive reactor) and put XL = 8 ohms on the nameplate only if the
coil is labeled with the proper operating ? .
a.
current
b.
frequency
c.
resistance
d.
voltage
The correct answer is: frequency
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Knowing the voltage and the inductive reactance of a purely reactive circuit, drag the variables to the
correct locations to create the formula used to solve for the current.
? = ?/?
variables
E
I
XL
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A circuit has a voltage of 240 volts and an inductive reactance of 30 ohms.
What is the current flow?
The correct answer is: 8 A
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Given a 2-henry inductor connected to a 500-volt, 60-hertz source, solve for the following: (Round the
FINAL answers to at least two decimal places in the specified unit.)
What is the total inductive reactance? 753.98
How much current flows in the circuit? 663
The correct answer is: 753.98 Ω
The correct answer is: 663 mA
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A coil is connected to a 300-volt, 60-hertz circuit and draws a certain current. If the voltage remains 300
volts, and the frequency is increased to 400 hertz, the current would ? .
a.
increase
b.
decrease
c.
stay the same
The correct answer is: decrease
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A purely inductive 120-volt, 60-hertz circuit draws 2.7 amperes. What is the reactance of the circuit?
(Round the FINAL answer to one decimal place.)
The correct answer is: 44.4 Ω
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A coil has an inductance of 250 millihenries. Find its inductive reactance at 60 hertz.
The correct answer is: 94.2 Ω
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A 50-millihenry coil is connected to a 60-hertz, 240-volt source. How much current flows? (Round the
FINAL answer to one decimal place.)
The correct answer is: 12.7 A
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An inductor in a 60 hertz circuit has 80 volts AC across it with four amperes flowing through it. What is the
inductance of the inductor? (Round the FINAL answer to three decimal places.)
The correct answer is: 0.053 H
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A 750-millihenry inductor has 20 volts dropped across it when five milliamperes flow in the circuit. What is
the frequency? (Round the FINAL answer to two decimal places.)
Answer:
The correct answer is: 849.26 Hz
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Find the current through a 107-millihenry inductor if it is connected to a 6-volt, 400-hertz source. (Round
the FINAL answer to three decimal places.)
The correct answer is: 0.022 A
