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Inductors
Five inductors are connected in series. The lowest value is 8 μH. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is
248 μH
64 μH
8 H
32 μH
248 μH
64 μH
8 H
32 μH
Answer
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Related Question
Inductors
Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?
219 kΩ
66 kΩ
1.3 MΩ
660 kΩ
219 kΩ
66 kΩ
1.3 MΩ
660 kΩ
Answer
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Inductors
An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then
VR ≥ VL
VL > VR
VL < VR
VL = VR
VR ≥ VL
VL > VR
VL < VR
VL = VR
Answer
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Inductors
A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current
is decreased
momentarily goes to zero
is increased
does not change
is decreased
momentarily goes to zero
is increased
does not change
Answer
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Inductors
The voltage across a coil when di/dt = 20 mA/s and L = 8 H is
16 mV
1.6 mV
2.5 mV
160 mV
16 mV
1.6 mV
2.5 mV
160 mV
Answer
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Inductors
The inductance of an iron-core coil decreases if
the number of turns is decreased
the length of the coil decreases
None of these
the iron core is removed
the number of turns is decreased
the length of the coil decreases
None of these
the iron core is removed
Answer
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