⚡ Electrical Engineering Solved MCQs with Answers

Practice 757 approved ⚡ Electrical Engineering questions with verified answers from the 🛠️ Engineering Essentials subject for Pakistan exams.

757 solved MCQs

A 10 μF, 20 μF, 22 μF, and 100 μF capacitor are in parallel. The total capacitance isAnswer: 152 μF A capacitor and a resistor are connected in series to a sine wave generator. The frequency is set so that the capacitive reactance is equal to the resistance and, thus, an equal amount of voltage appears across each component. If the frequency is increasedAnswer: Vᵣ > V꜀ A capacitor of 0.02 μF is larger thanAnswer: 2,000 pF In Question 6, the capacitor will reach full charge in a time equal to approximatelyAnswer: 5 RC What is the capacitance when Q = 60 μC and V = 12 V?Answer: 5 μF A 0.47 μF capacitor is across a 2 kHz sine wave signal source. The capacitive reactance isAnswer: 170 Ω Four 0.15 μF capacitors are in parallel. The total capacitance isAnswer: 0.6 μF Which of the following capacitors is polarized?Answer: Electrolytic A capacitor of 2,000 pF is greater thanAnswer: 0.0002 μF A 220 resistor is in series with a 2.2 F capacitor. The time constant isAnswer: 480 μs A 4.7 MΩ resistor is in series with a 0.015 μF capacitor. The combination is across a 12 V source. How long does it take the capacitor to fully charge?Answer: 352 ms A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the currentAnswer: decreases Of the following capacitors, which one has the highest dielectric constant?Answer: glass A 0.01 μF capacitor equals how many picofarads?Answer: 10,000 pF A 12 kHz voltage is applied to a 0.33 μF capacitor, and 200 mA of rms current is measured. What is the value of the voltage?Answer: 8 V A 0.00022 F capacitor equals how many microfarads?Answer: 220 μF Two series capacitors (one 2 μF, the other of unknown value) are charged from a 24 V source. The 2 μF capacitor is charged to 16 V and the other to 8 V. The value of the unknown capacitor isAnswer: 4 μF A 330 pF capacitor and a 220 pF capacitor are each connected across a 6 V dc source. The voltage across the 330 pF capacitor isAnswer: 6 V A 2 μF, a 4 μF, and a 10 μF capacitor are connected in series. The total capacitance is less thanAnswer: 1.5 μF When the plate area of a capacitor increases,Answer: the capacitance increases Two 0.68 μF capacitors are connected in series across a 10 kHz sine wave signal source. The total capacitive reactance isAnswer: 46.8 Ω An uncharged capacitor and a 1 kΩ resistor are connected in series with a switch and a 6 V battery. At the instant the switch is closed, the voltage across the capacitor isAnswer: 0 V When the voltage across a capacitor is tripled, the stored chargeAnswer: triples An inductance of 0.08 H is larger thanAnswer: 0.000000008 H A 240 H inductor is equivalent to aAnswer: 0.240 mH inductor A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance isAnswer: 5.5 mH A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance isAnswer: Less than 0.6 mH The voltage across a coil when di/dt = 20 mA/s μ and L = 8 μ H isAnswer: 160 mV A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the currentAnswer: is increased 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?Answer: 660 kΩ