⚡ 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

The internal resistance of a 20,000 ohm/volt voltmeter set on its 5 V range isAnswer: 100,000 Ω Two 1.2 kΩ resistors are in series and this series combination is in parallel with a 3.3 kΩ resistor. The total resistance isAnswer: 1389 Ω The output of a certain voltage divider is 12 V with no load. When a load is connected, the output voltageAnswer: decreases A certain voltage divider consists of two 12 kΩ resistors in series. Which of the following load resistors will have the most effect on the output voltage?Answer: 12 k Ω A voltage divider consists of two 68 kΩ resistors and a 24 V source. The unknown output voltage isAnswer: 12 V Three 10 kΩ resistors are connected in series. A 20 kΩ resistor is connected in parallel across one of the 10 kΩ resistors. The voltage source is 24 V. The total current in the circuit isAnswer: 900 μ A A certain voltage divider consists of three 1 kΩ resistors in series. Which of the following load resistors will have the least effect on the output voltage?Answer: 1 MΩ The parallel combination of a 470 Ω resistor and a 1.5 kΩ resistor is in series with the parallel combination of five 1 kΩ resistors. The source voltage is 50 V. The percentage of the load current through any single 1 kΩ resistor isAnswer: 20% A certain Wheatstone bridge has the following resistor values: R1 = 10 kΩ, R2 = 720 Ω, and R4 = 2.4 kΩ. The unknown resistance isAnswer: 3000 Ω On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?Answer: 1,000 V The internal resistance of a 30,000 ohm/volt voltmeter set on its 50 V range isAnswer: 1,500,000 Ω The parallel combination of a 6.8 kΩ resistor and a 10 kΩ resistor is in series with the parallel combination of a 2.2 kΩ resistor and a 1 kΩ resistor. A 100 V source is connected across the circuit. The resistor(s) with the greatest voltage drop is (are)Answer: 6.8 kΩ and 10 kΩ When a load resistance is removed from the output of a voltage divider circuit, the current drawn from the sourceAnswer: decreases A certain circuit is composed of two parallel resistors. The total resistance is 1,403 Ω. One of the resistors is 2 kΩ. The other resistor value isAnswer: 4.7 kΩ The parallel combination of a 470 Ω resistor and a 680 Ω resistor is in series with the parallel combination of four 2 kΩ resistors. The total resistance isAnswer: 778 Ω A 12 kΩ resistor, a 15 kΩ resistor, and a 22 kΩ resistor are in series with two 10 kΩ resistors that are in parallel. The source voltage is 75 V. Current through the 15 kΩ resistor is approximatelyAnswer: 1.4 mA A 6 V battery output is divided down to obtain two output voltages. Three 2.2 k resistors are used to provide the two taps. The two output voltages areAnswer: 2 V, 4 V Two 3.3 kΩ resistors are in series and this series combination is in parallel with a 4.7 kΩ resistor. The voltage across one of the 3.3 kΩ resistors is 12 V. The voltage across the 4.7 kΩ resistor isAnswer: 24 V A balanced Wheatstone bridge consists of an RV of 3,500 Ω, an R2 of 200 Ω, and an R3 of 680 Ω. The value of Rᵁᴺᴷ isAnswer: 1,029 Ω In a certain five-step R/2R ladder network, the smallest resistor value is 1 k. The largest value isAnswer: 2 kΩ A voltage divider consists of two 100 kΩ resistors and a 12 V source. What will the output voltage be if a load resistor of 1 MΩ is connected to the output?Answer: 5.7 V The parallel combination of a 470 Ω resistor and a 1.2 kΩ resistor is in series with the parallel combination of three 3 kΩ resistors. A 200 V source is connected across the circuit. The resistor with the most current has a value ofAnswer: 470 Ω A certain current source has the values IS = 4 µA and RS = 1.2 M. The values for an equivalent voltage source areAnswer: 4.8 V, 1.2 MΩ A 680 Ω load resistor, RL, is connected across a constant current source of 1.2 A. The internal source resistance, RS, is 12 kΩ. The load current, RL, isAnswer: 1.14 A A 120 V voltage source has a source resistance, RS, of 60 Ω. The equivalent current source isAnswer: 2 A A 12 V source has an internal resistance of 90 Ω. If a load resistance of 20 Ω is connected to the voltage source, the load power, PL, isAnswer: 238 mW In a two-source circuit, one source acting alone produces 12 mA through a given branch. The other source acting alone produces 10 mA in the opposite direction through the same branch. The actual current through the branch isAnswer: 2 mA A 470 Ω RL is connected across a voltage source, VS, of 120 V. The source's internal resistance, RS, is 12 Ω. What is the output voltage across the load?Answer: 117 V A 2 Ω RL is connected across a voltage source, VS, of 110 V. The source's internal resistance is 24 Ω. What is the output voltage across the load?Answer: 8.5 V An 18 V source has an internal resistance of 70 Ω. If a load resistance of 33 Ω is connected to the voltage source, the load power, PL, isAnswer: 1 W