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 VL > VR VL < VR VL = VR VR ≥ VL TRUE ANSWER : ? YOUR ANSWER : ?
The inductance of an iron-core coil decreases if the length of the coil decreases None of these the number of turns is decreased the iron core is removed TRUE ANSWER : ? YOUR ANSWER : ?
A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current is increased does not change momentarily goes to zero is decreased 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? 660 kΩ 219 kΩ 1.3 MΩ 66 kΩ 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 180 mV 1.25 mV 18 mV TRUE ANSWER : ? YOUR ANSWER : ?
Three 15 mH inductors are in series. The total inductance is 15 mH 45 mH 30 mH 5 mH 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 100 mA 1 mA 1 A 10 mA TRUE ANSWER : ? YOUR ANSWER : ?
A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is 55 mH less than 5.5 mH less than 0.2 mH 5.5 mH TRUE ANSWER : ? YOUR ANSWER : ?
A 240 H inductor is equivalent to a 0.000240 mH inductor 240 mH inductor 240 H inductor 0.240 mH inductor TRUE ANSWER : ? YOUR ANSWER : ?
An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is good partly shorted open shorted TRUE ANSWER : ? YOUR ANSWER : ?