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? 1.3 MΩ 219 kΩ 66 kΩ 660 kΩ TRUE ANSWER : ? YOUR ANSWER : ?
The following coils are in parallel: 75 H, 40 H, 25 H, and 15 H. The total inductance is approximately 155 μH 14 μH 6.9 μH 2.2 μH TRUE ANSWER : ? YOUR ANSWER : ?
When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field does not change doubles quadruples is quartered 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 : ?
A 240 H inductor is equivalent to a 240 mH inductor 0.240 mH inductor 0.000240 mH inductor 240 H inductor TRUE ANSWER : ? YOUR ANSWER : ?
The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is 1.8 mV 1.25 mV 18 mV 180 mV TRUE ANSWER : ? YOUR ANSWER : ?
Three 15 mH inductors are in series. The total inductance is 30 mH 15 mH 5 mH 45 mH TRUE ANSWER : ? YOUR ANSWER : ?
The voltage across a coil when di/dt = 20 mA/s and L = 8 H is 160 mV 16 mV 2.5 mV 1.6 mV 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 87 A 87 mA 337 mA 870 mA TRUE ANSWER : ? YOUR ANSWER : ?
An inductor, a 1 k resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is 0 V 6 V 4 V 12 V TRUE ANSWER : ? YOUR ANSWER : ?