⚡ 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

For 12 V and 40 mA, the power isAnswer: all of the above A 220 Ω resistor dissipates 3 W. The voltage isAnswer: 25.7 V A 3.3 kΩ resistor dissipates 0.25 W. The current isAnswer: 8.7 mA A half-watt is equal to how many milliwatts?Answer: 500 mW Three hundred joules of energy are consumed in 15 s. The power isAnswer: 20 W The power rating of a carbon-composition resistor that is to handle up to 1.2 W should beAnswer: 2 W How much continuous current can be drawn from a 60 Ah battery for 14 h?Answer: 4.28 A A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximatelyAnswer: 12 V When the current through a 12 kΩ resistor is 8 mA, the power isAnswer: 768 mW A 68 Ω resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor isAnswer: 132 mW When a fourth resistor is connected in series with three resistors, the total resistanceAnswer: Increases A string of five series resistors is connected across a 6 V battery. Zero voltage is measured across all resistors except R3. The voltage across R3 isAnswer: 6 V A series circuit consists of three resistors with values of 120 , 270 , and 330 . The total resistance isAnswer: 720 Ω A certain series circuit consists of a 1/8 W resistor, a 1/4 W resistor, and a 1/2 W resistor. The total resistance is 1200 Ω . If each resistor is operating in the circuit at its maximum power dissipation, total current flow isAnswer: 27 mA Which of the following series combinations dissipates the most power when connected across a 120 V source?Answer: one 220 Ω resistor When one of three series resistors is removed from a circuit and the circuit is reconnected, the currentAnswer: increases The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipatesAnswer: 3 W The following resistors (one each) are connected in a series circuit: 470 Ω, 680 Ω, 1 kΩ, and 1.2 kΩ. The voltage source is 20 V. Current through the 680 Ω resistor is approximatelyAnswer: 6 mA A series circuit consists of a 4.7 kΩ, a 12 kΩ, and a 2.2 kΩ resistor. The resistor that has the most voltage drop isAnswer: the 12 kΩ All the voltage drops and the source voltage added together in a series circuit is equal toAnswer: Zero Two resistors are in series: a 5.6 kΩ resistor and a 4.7 kΩ resistor. The voltage drop across the 5.6 kΩ resistor is 10 V. The voltage across the 4.7 kΩ resistor isAnswer: 8.39 V Three 680 Ω resistors are connected in series with a 470 V source. Current in the circuit isAnswer: 230 mA There are five resistors in a given series circuit and each resistor has 6 V dropped across it. The source voltageAnswer: is 30 V If a 6 V and a 9 V source are connected series aiding, the total voltage isAnswer: 15 V Five resistors are connected in a series and there is a current of 3 A into the first resistor. The amount of current into the second resistor isAnswer: 3 A The total resistance of eight 5.6 kΩ resistors in series isAnswer: 44,800 Ω A series circuit has a 24 V source and a total resistance of 120 Ω . The current through each resistor isAnswer: 200 mA To measure the current out of the second resistor in a circuit consisting of four resistors, an ammeter can be placedAnswer: at any point in the circuit A 12 V battery is connected across a series combination of 68 Ω, 47 Ω, 220 Ω, and 33 Ω. The amount of current isAnswer: 32.6 mA If a 24 V and a 6 V battery are series opposing, the total voltage isAnswer: 18 V