⚡ 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

Lead acid batteries discharge with time because of:Answer: Both A and B Pickle (Achaar in urdu ) when placed in the path of current.Answer: Will conduct current While reading the above paragraph, we learn that:Answer: Silicon which is used to fabricate integrated circuits is extracted from sand You have 20 inductors available each of 15 H. you need an inductor of 1 H in a circuit. You achieve it by combination?Answer: 15 inductors in parallel A thermistor with negative temperature co-efficient is placed in a furnace. When temperature of furnace increases the resistance:Answer: Decreases AC voltage is passed through single diode rectifier, the output of the rectifier is:Answer: Half wave DC If two NOT gates in parallel are attached to NAND gate in series, the gate formed is:Answer: OR A transformer has 100 turns on the input side and 500 t6urns on the output side. If rms value of input voltage and current is 220V and 5A respectively. The output power is:Answer: 1100 Watt A tight wire is clamped at two points 2 m apart. It is plucked near one end, what are the three longest wavelengths produced on the vibrating wire:Answer: 4 m, 2 m, 1.33 m A 500 kg rocket travels in deep space at a constant speed of 3000 m sec -1. The power being produced by the rocket engine at this time is:Answer: None of these You have 10 resistors available, each of 20 KW. You need to form a 2.5 KW resistor for your circuit using the available resistors. You can connect:Answer: Eight 20 kΩ in parallel You have 15 capacitors available with you, each of 15 nF. You need a capacitance for around 150 nF in a circuit.Answer: 10 capacitors in parallel In which of the following communication mode, each station can both transmit and receive, but not at the same time, when one device is sending, the other can only receive and vice versa?Answer: Half-Duplex What is the overall time complexity of the merge sort algorithm?Answer: O(n log n) What are the advantages of complied languages? It is easy to write the source code, It is faster to declare variables, Their execution speed is faster, Both A and BAnswer: Their execution speed is faster Informally, an algorithm can be said to extinguish a growth rate on the order of a function mathematics if beyond a certain input size n. The function f(n) times a positive constant provide an upper bound or limit for the run-time of that algorithm. in other words, for a given input size n greater than some no and a constant c, the running time of that algorithm will never b larger than ______?Answer: C × f(n) Dielectric strength In case of mica can be expected to be more thanAnswer: 1500 kV/mm Polar dielectric are normally used forAnswer: Energy storage and capacitor applications Which of the following are polar dielectricAnswer: Water The impurity in liquid dielectric which has significant effect in reducing the breakdown strength, isAnswer: Moisture A good dielectric should have all the following properties exceptAnswer: High electrical conductivity The variety of paper used for insulation purpose isAnswer: Kraft paper In van de graaff generator output voltage is controlled byAnswer: Size of the upper dome A tesla coil isAnswer: A high-frequency high-voltage transformer Insulators for high voltage applications are tested forAnswer: Dielectric strength Transformer contribute to radio interference due toAnswer: Corona discharge The electrical breakdown strength of insulating material depend onAnswer: All of these Vacuum insulation is used in all of the following exceptAnswer: Power transformers Liquid are generally used as insulating material up to voltage stresses of aboutAnswer: 50 kV/cm The number 3.2 * 10^-5 A expressed using a metric prefix isAnswer: 32 μA