⚡ 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

In alternating current, inductor behaves like.Answer: Resistor Material in which there is a very narrow gap between the conduction and valence energy bands are called:Answer: Semiconductor A transformer has 50 turns on the input side and 3200 turns on the output side. If the mass value of the input voltage and current are 120 va and 3V, then the output power is about:Answer: 1440 watts A ammeter can be made from a galvanometer by adding a:Answer: Low resistance in parallel A point charge q produces an absolute potential of 5v at a distance of 1 meter. What will be the absolute potential due to q at a distance of 3 meter?Answer: 5/9 V The voltage current graph of a non-ohmic device is:Answer: Not a straight line An air filled parallel plate capacitor has capacitance of 10 uF. A slab of dielectric of relative permittivity 100 is introduced between thee plate. The capacitance now:Answer: 1000 uF In a multiple graded index fiber, periphery as compared to the central core has a;Answer: Lower refractive index A satellite communication system can be set up by correctly positioning:Answer: 3 geo-stationary satellites AOB is sector of a circle whose center is O and radius 5cm. if he perimeter of the sector is 14cm then the value of the angle AOB (in radius is):Answer: 0.5 radians You have 15 capacitors available with you, each of 15nF. You need a capacitance of around 150nF in a circuit. You can achieve this value by connecting.Answer: 10 capacitors in parallel Current through a 2mH inductor is i(L) -2sin 100 Amps. The voltage across the inductor will be:Answer: 400 mv A transistor cannot be used as a:Answer: Power source Reception of a particular radio station is selected by tuning the tuning knob of a radio. Tuning the tuning knob changes the:Answer: Capacitance of the tuning circuit AC voltage is fed into a single diode rectifier. The output of the rectifier is:Answer: Half wave rectified DC voltage In frequency modulation, the amplitude of the carrier waves remains the same butits frequency changes in proportion to:Answer: The amplitude of the modulating signal An transformer has 100 turns on the input side and 500 turns on the output side. If the rms values of the input voltage and current are 200 v and 2A respectively, then the output power is about:Answer: 1440 watts One of the environment friendly means of generating circuit power is from Bio-gas. Bio-gas is?Answer: Produce from cattle gas Lead acid batteries discharge with time because ofAnswer: Both A and B A themistor with negative temperature co-efficient is placed in a furnace. When temperature of furnace increases the resistance?Answer: Decreases Reception of particular radio station selected by tuning the tuning knob of radio tuning the tuning knob changes the?Answer: Capacitance You have 20 inductors available each of 15H. You need an inductor of 1H in a circuit. You achieve it by combination?Answer: 15 inductors in parallel A transformer has 100 turns on the input side 500 turns on the output side. If rms value of input voltage are 220V and 5A respectively. The output power is:Answer: 1100 watt A tight wire is clamped at two points 2m apart. It is plucked near one end, what are the three longest wavelengths produced on the vibrating wire?Answer: 4m, 2m, 1.33m You have 20 capacitors available with you, each of 15 F. you need a capacitor of around 1 F in a circuit. You can achieve this value by connecting:Answer: 15 capacitors in series A thermistor with positive temperature coefficient is used to measure temperature in a furnace:Answer: Increases Two progressive waves of frequency 250 Hz are superimposed to produce a stationary wave in which adjacent nodes are 2 m apart. The speed of the progressive waves is:Answer: 1000 m/sec A constant current of 1 ampere flows in an electrical component over a period of 5 seconds. The total charge flowing through the component over this duration is:Answer: 5 Coulombs The current flowing in an electrical component increases linearly from 0 to 5 A over 5 seconds. The total charge flowing through the component over this duration is:Answer: 12.5 Coulombs A current carrying wire loop is placed in between the poles of a magnet as shown in the figure below. The direction if current flow is also shown in the figure. With respect to the axis, the wire loop will tend to:Answer: Move magnetic north