⚡ 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

If the dc bus voltage Vd = 300v, the power consumed by 3 phase load isAnswer: 3 kW A resistance of 50 k ohm has a conductance ofAnswer: 0.02 mS Which of the following is incorrectAnswer: 1 J = 1 N/m Electromotive force is provided byAnswer: Source of electrical energy In order that work may be doneAnswer: A supply of energy is required Unit of resistivity isAnswer: Ω·m (Ohm-m) Output impedance of inverting op-amp isAnswer: Infinite In case of short circuit, current isAnswer: Infinite Bulb in streets are connected inAnswer: Parallel A 240V, 60W lamp has a working resistance ofAnswer: 960 Ω R=10, I=2, P=Answer: 40 W Conductance is the reciprocal ofAnswer: Resistance The motor use in ceiling fan isAnswer: Capacitor motor In brief, the higher voltage spike on ac power line is calledAnswer: Arc Voltage drop isAnswer: Potential difference between two points Three basic quantities of electrical areAnswer: V, I, R 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 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 . If each resistor is operating in the circuit at its maximum power dissipation, total current flow isAnswer: 27 mA 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 At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?Answer: 1.286 kWh A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?Answer: 2.2 mA Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 k of resistance?Answer: 5.9 mA Four amperes of current are measured through a 24 resistor connected across a voltage source. How much voltage does the source produce?Answer: 96 V The number 3.2 × 10–5 A expressed using a metric prefix isAnswer: 32 µA If 750 µA is flowing through 11 k of resistance, what is the voltage drop across the resistor?Answer: 8.25 V A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?Answer: 2.2 mA Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 k of resistance?Answer: 5.9 mA Four amperes of current are measured through a 24 resistor connected across a voltage source. How much voltage does the source produce?Answer: 96 V A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio isAnswer: 5