⚡ 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

Why commutators and brushes are recommended for high DC voltage generators?Answer: Produces spark Heat applied to a thermocouple will cause a small electromotive force and therefore a small current to flow. Practical use of this is mainly in _____?Answer: Instruments A residual-current device (RCD) is widely used in electrical circuits?Answer: For shock safety A measure of the ability of a material to resist the flow of an electric current is called as ____?Answer: Resistivity Liquids that conduct an electric current are called ______?Answer: Electrolytes A _____ is an electric circuit offering little or no resistance to the flow of electrons.Answer: Short circuit The voltage _____ is used in a vehicle to control the voltage produced at the output of the alternator.Answer: Regulator Ohm's law states that in a closed circuit current is proportional to the _____ and inversely proportional to the _____?Answer: Voltage, resistance The _____ is unit used for electrical generator or transformer to express its value/capacity.Answer: KVA Before measuring value of unknown voltage or frequency by oscilloscope it must be calibrated?Answer: All of the above Battery of a vehicle is charged due to a ______?Answer: Chemical effect Which one of the following is an insulator material?Answer: Porcelain ______ is a component that conducts current in one direction only.Answer: Diode A _____ consists of two conductors separated by a non-conductive region.Answer: Capacitor Current flowing in a conducter will set up a magnetic field around the conductor. The strength of the magnetic field determined by?Answer: How much current is flowing? Which one of the following devices stores energy within itself in the form of magnetic field?Answer: Inductor Resistors which are connected in _______ are connected with side-by-side fashion such that the charge approaching the resistors will split up into two or more different paths.Answer: Parallel In a parallel circuit the charge which passes through one resistor will ______ through the other will resistors.Answer: Always pass ______ refers to the rate at which energy is supplied or converted by the appliance or circuit.Answer: Power In electrical cables AWG stands for _______?Answer: American Wire Gauge As the value of AWG increases the thickness of wire?Answer: Decreases For high current flow in electrical circuits one needs _____?Answer: Thick conductors ______ may be used to reduce current flow, and, at the same time, may act to lower voltage levels within circuits.Answer: Resistors The materials are called conductors if the electrons _____?Answer: Can move easily Materials that block flow of electrons are called _____?Answer: Insulators In a gasoline vehicle, _____ the tends to prevent an arc at the contacts.Answer: Capacitor/spark plug The "opposing" Electromotive Force is often described as a/an _____?Answer: Back Electromotive Force The storage battery provides electrical energy through ______?Answer: Chemical reactions In the electrical companies there must be fire safety to avoid danger, commonly used equipment is ____?Answer: Fire extinguisher When a generator in the electrical system of a motor vehicle produces more electrical energy than required for ignition and for operating electrical accessories, the surplus (under certain conditions) passes through the battery to reverse the chemical reaction. This is known as ______ the battery.Answer: Charging