Electrical Inductors MCQs with Explanations

Increasing the number of turns or using thinner wire is the correct answer to “The winding resistance of a coil can be increased by”. This question is standard in competitive examination syllabi for Electrical Inductors.

100 mA is the correct answer to “An 18 V power supply is connected across a coil with a winding resistance of 180 Ω. Current flow in the coil is”. This question is standard in competitive examination syllabi for Electrical Inductors.

6 V is the correct answer to “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”. This question is standard in competitive examination syllabi for Electrical Inductors.

248 µH is the correct answer to “Five inductors are connected in series. The lowest value is 8 µH. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is”. This question is standard in competitive examination syllabi for Electrical Inductors.

5.5 mH is the correct answer to “A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is”. This question is standard in competitive examination syllabi for Electrical Inductors.

Less than 0.6 mH is the correct answer to “A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is”. This question is standard in competitive examination syllabi for Electrical Inductors.

45 mH is the correct answer to “Three 15 mH inductors are in series. The total inductance is”. This question is standard in competitive examination syllabi for Electrical Inductors.

0.000000008 H is the correct answer to “An inductance of 0.08 µH is larger than”. This question is standard in competitive examination syllabi for Electrical Inductors.

0.05 H is the correct answer to “An inductance of 0.43 mH is smaller than”. This question is standard in competitive examination syllabi for Electrical Inductors.

160 mV is the correct answer to “The voltage across a coil when $$\frac{{{\text{di}}}}{{{\text{dt}}}}$$ = 20 mA/µs and L = 8 µH is”. This question is standard in competitive examination syllabi for Electrical Inductors.

True is the correct answer to “Faraday's law states that relative motion between a magnetic field and a coil induces a voltage across the coil.”. This question is standard in competitive examination syllabi for Electrical Inductors.

False is the correct answer to “Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core.”. This question is standard in competitive examination syllabi for Electrical Inductors.

Is increased is the correct answer to “A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current”. This question is standard in competitive examination syllabi for Electrical Inductors.

18 mV is the correct answer to “The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is”. This question is standard in competitive examination syllabi for Electrical Inductors.

660 kΩ is the correct answer to “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”. This question is standard in competitive examination syllabi for Electrical Inductors.

False is the correct answer to “Energy is stored by an inductor in an electrostatic field.”. This question is standard in competitive examination syllabi for Electrical Inductors.

True is the correct answer to “XL is directly proportional to frequency and inductance.”. This question is standard in competitive examination syllabi for Electrical Inductors.

False is the correct answer to “All coil cores are made of iron.”. This question is standard in competitive examination syllabi for Electrical Inductors.

True is the correct answer to “The term 'choke' is more commonly used in connection with an inductor used to block off high frequencies.”. This question is standard in competitive examination syllabi for Electrical Inductors.

78 mA is the correct answer to “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”. This question is standard in competitive examination syllabi for Electrical Inductors.

Shorted is the correct answer to “An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is”. This question is standard in competitive examination syllabi for Electrical Inductors.

Decreases is the correct answer to “When the current through an inductor decreases, the amount of energy stored in the electromagnetic field”. This question is standard in competitive examination syllabi for Electrical Inductors.

Is quartered is the correct answer to “When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field”. This question is standard in competitive examination syllabi for Electrical Inductors.

6.9 µH is the correct answer to “The following coils are in parallel: 75 µH, 40 µH, 25 µH, and 15 µH. The total inductance is approximately”. This question is standard in competitive examination syllabi for Electrical Inductors.

False is the correct answer to “Inductors add in parallel.”. This question is standard in competitive examination syllabi for Electrical Inductors.

0.48 µs is the correct answer to “A 320 µH coil is in series with a 3.3 kΩ resistor. How long does it take for current to build up to its full value”. This question is standard in competitive examination syllabi for Electrical Inductors.

0.240 mH inductor is the correct answer to “A 240 µH inductor is equivalent to a”. This question is standard in competitive examination syllabi for Electrical Inductors.

The number of turns is decreased is the correct answer to “The inductance of an iron-core coil decreases if”. This question is standard in competitive examination syllabi for Electrical Inductors.

True is the correct answer to “The permeability of a core material is an indication of the ability of the material to establish a magnetic field.”. This question is standard in competitive examination syllabi for Electrical Inductors.

870 mA is the correct answer to “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”. This question is standard in competitive examination syllabi for Electrical Inductors.

False is the correct answer to “An induced voltage is produced as a result of a dc voltage.”. This question is standard in competitive examination syllabi for Electrical Inductors.

True is the correct answer to “Inductance is the property of an inductor that produces an opposition to any change in current.”. This question is standard in competitive examination syllabi for Electrical Inductors.

VL > VR is the correct answer to “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”. This question is standard in competitive examination syllabi for Electrical Inductors.