⚡ 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 resistor is connected across a 50V source. What is the current in the resistor if the color code is red, orange, orange, silverAnswer: 2.17 mA Approximately how many mill amperes of current flow through a circuit with a 40V source an d6.8Kohm of resistanceAnswer: 5.88 mA When a forth resistor is connected in series with three resistors, the total resistanceAnswer: Increases A string of five series resistor is connected across a 6 V battery. Zero voltage is measured across all resistors except R3. The voltage across R3 isAnswer: 6 V A certain series circuit consists of a 1/8W, 1/4W, and 1/2W resistors. The total resistance is 1200 ohm. If each resistor is operating in the circuit at its maximum power dissipation, total current flow isAnswer: 27 mA The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipatesAnswer: 3W The output of a certain voltage divider is 12 V with no load. When a load is connected, the output voltageAnswer: Decreases below 12 V The parallel combination of a 470 resistor and a 1.5 k resistor is in series with the parallel combination of five 1 k resistors. The source voltage is 50 V. The percentage of the load current through any single 1 k resistor isAnswer: 20% A 20 kHz pulse waveform consists of pulses that are 15 s wide. The duty cycleAnswer: 30% 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 In a series RC circuit, 12 V (rms) is measured across the resistor and 15 V (rms) is measured across the capacitor. The rms source voltage isAnswer: 19.2 V An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must existAnswer: R In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage isAnswer: 40 V In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage isAnswer: 40 V In applying the superposition theorem, the sources are considered one at a time with all others replaced by their internal impedance.Answer: Superposition Theorem In order to get maximum power transfer from a capacitive source, the load must…Answer: Have impedance that is the complex conjugate of the source impedance A half-watt is equal to how many mill watts?Answer: 500 mW A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor isAnswer: 1.32 W When the speed at which a conductor is moved through a magnetic field is increased, the induced voltageAnswer: Increases The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s isAnswer: 2,000 V If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux densityAnswer: Decreases A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil willAnswer: Decrease What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?Answer: 16 kVA A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio isAnswer: 1:5 The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turn’s ratio is 8?Answer: 880 V The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turn’s ratio is 8?Answer: 880 V In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current isAnswer: Four times the primary current In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?Answer: 111.5 W When both inputs of NAND gate is high, output will beAnswer: Low The RMS value of load phase voltage isAnswer: 141.4 V