⚡ 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 series circuit consists of three resistors. Two resistors are 1.2 kΩ each. The total resistance is 12 kΩ. The value of the third resistorAnswer: is 9,600 Ω Four equal-value resistors are in series with a 12 V battery and 13.63 mA are measured. The value of each resistor isAnswer: 220 Ω Two 1.5 V cells are connected series opposing across two 100 Ω resistors in series. Total current flow isAnswer: 0 A The total resistance of a circuit is 680 Ω. The percentage of the total voltage appearing across a 47 Ω resistor that makes up part of the total series resistance isAnswer: 6.91% Two 6 V batteries are connected series aiding across two 1.2 kΩ resistors in series. Current through each resistor isAnswer: 5 mA An ammeter has an internal resistance of 50 Ω. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, Rₛₕ₁, is approximatelyAnswer: 5.5 Ω The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω resistor that makes up part of the parallel circuit is approximatelyAnswer: 22 mA The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction isAnswer: 7 A When an additional resistor is connected across an existing parallel circuit, the total resistanceAnswer: decreases When a 1.6 kΩ resistor and a 120 Ω resistor are connected in parallel, the total resistance isAnswer: less than 120 Ω but greater than 100 Ω If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current isAnswer: 70 mA Three lights are connected in parallel across a 120 volt source. If one light burns out,Answer: the remaining two will glow with the same brightness as before Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor isAnswer: 20 KΩ A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 kΩ. The current through each bulb is approximatelyAnswer: 61 mA The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation isAnswer: 4.8 W A 470 Ω resistor, a 220 Ω resistor, and a 100 Ω resistor are all in parallel. The total resistance is approximatelyAnswer: 60 Ω Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximatelyAnswer: 1.8 A Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 Ω, the current through each parallel resistor isAnswer: 6.25 mA Five 100 Ω resistors are connected in parallel. If one resistor is removed, the total resistance isAnswer: 25 Ω Four 8 Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakersAnswer: 72 W In a certain three-branch parallel circuit, R₁ has 12 mA through it, R₂ has 15 mA through it, and R₃ has 25 mA through it. After measuring a total of 27 mA, you can say thatAnswer: R₃ is open A sudden increase in the total current into a parallel circuit may indicateAnswer: an increase in source voltage The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches isAnswer: 1.24 A The following resistors are in parallel across a voltage source: 220 Ω, 470 Ω, and 560 Ω. The resistor with the least current isAnswer: 560 Ω Three 47 Ω resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximatelyAnswer: 7.06 A There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor isAnswer: 490 mA Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit isAnswer: 31.25 mA If one of the resistors in a parallel circuit is removed, the total resistanceAnswer: increases Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistanceAnswer: is less than 600 Ω In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches isAnswer: 12 mA