Curioustab

Home » Electrical Engineering » Inductors

The inductance of an iron-core coil decreases if

the number of turns is decreased
the iron core is removed
the length of the coil decreases
none of the above

Correct Answer: the number of turns is decreased

← Previous Question Next Question→

More Questions from Inductors

Two inductors, L1 and L2, are in parallel. L1 has a value of 25 µH and L2 a value of 50 µH. The parallel combination is in series with L3, a 20 µH coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is
Three 15 mH inductors are in series. The total inductance is
The following coils are in parallel: 75 µH, 40 µH, 25 µH, and 15 µH. The total inductance is approximately
A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
An 18 V power supply is connected across a coil with a winding resistance of 180 Ω. Current flow in the coil is
A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is
When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
An inductor, a 1 kΩ resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is
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
A 240 µH inductor is equivalent to a

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion