A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is less than 0.2 mH 55 mH 5.5 mH less than 5.5 mH TRUE ANSWER : ? YOUR ANSWER : ?
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? 400 mA 78 mA 91 mA 57 mA TRUE ANSWER : ? YOUR ANSWER : ?
A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current does not change is decreased momentarily goes to zero is increased TRUE ANSWER : ? YOUR ANSWER : ?
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 TRUE ANSWER : ? YOUR ANSWER : ?
An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is 1 mA 10 mA 100 mA 1 A TRUE ANSWER : ? YOUR ANSWER : ?
An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is good open partly shorted shorted TRUE ANSWER : ? YOUR ANSWER : ?
Two inductors, L1 and L2, are in parallel. L1 has a value of 25 H and L2 a value of 50 H. The parallel combination is in series with L3, a 20 H coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is 870 mA 87 A 337 mA 87 mA TRUE ANSWER : ? YOUR ANSWER : ?
A 240 H inductor is equivalent to a 0.240 mH inductor 240 mH inductor 240 H inductor 0.000240 mH inductor TRUE ANSWER : ? YOUR ANSWER : ?
The inductance of an iron-core coil decreases if the number of turns is decreased the iron core is removed None of these the length of the coil decreases TRUE ANSWER : ? YOUR ANSWER : ?
The following coils are in parallel: 75 H, 40 H, 25 H, and 15 H. The total inductance is approximately 14 μH 155 μH 2.2 μH 6.9 μH TRUE ANSWER : ? YOUR ANSWER : ?