Electrical Inductors - Study Mode
[#21] All coil cores are made of iron.
Correct Answer
(B) False
[#22] The term 'choke' is more commonly used in connection with an inductor used to block off high frequencies.
Correct Answer
(A) True
[#23] 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?
Correct Answer
(B) 78 mA
[#24] The winding resistance of a coil can be increased by
Correct Answer
(D) Increasing the number of turns or using thinner wire
[#25] An 18 V power supply is connected across a coil with a winding resistance of 180 Ω. Current flow in the coil is
Correct Answer
(C) 100 mA