Electric Power Question & AnswersFebruary 10, 2023 By Wat Electrical This article lists 100 Electric Power MCQs for engineering students. All the Electric Power Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Electric Power.The electrical energy transferred through an electrical circuit at a specific rate is referred to as Electric Power. P is the symbol that indicates Electric Power. The SI units are Joule/Second or Watts. Electric generators produce power and it is supplied using batteries. To homes and businesses, this energy is supplied by the industry of electric power via an Electrical grid. To deliver the power for longer distances transmission lines are utilized. The various applications for this power are light, heat, or motion with higher efficiencies.Based on power the components present in the electric circuits are classified into two different categories. They are Active and Passive devices. Power sources are considered Active devices whereas loads come under passive ones. An example of an active device is Rechargeable batteries, Electric appliances that consume power are passive device examples.Electric current flows forcefully from low electric to higher potentials in the active device. Positive in these devices flow from a negative terminal to positive ones and the energy gets converted from potential to chemical or mechanical making them act as a source of power. In passive the flow of current is from high to low potential and the energy gets converted into Kinetic energy in devices. 1). Electrical energy transferred in any electric circuitry at certain rates is __________.? Electric Current Electric Voltage Electric Pressure Electric Power None Hint2). P is the letter indicates ___________? Electric Current Electric Voltage Electric Pressure Electric Power None HintRead More about Electric Power 3). What will be the SI units for power? Farads Ohms Watt Coulombs None Hint4). What SI units for Electrical energy? Farads Ohms Watt Joules None Hint5). Electric generators produce _________? Electric Current Electric Voltage Electric Pressure Electric Power None Hint6). How does the electrical energy utilized in factories is measured? Farads Joules Coulombs Kilowatt-hour None Hint7). What is the electricity utilized by the 50 W bulb which is placed for 10 hours? 0 kWh 0.5 kWh 0.25 kWh 1 kWh None Hint8). Which is not the electric power unit? Joule/Volts Watts Volt-Amp Joules/sec None Hint9). What is the formula of Electric Power? IR VR VI V/I None Hint10). How much is energy i.e., consumed by an appliance for 1kW 1 hr? 36 Joules 360 Joules 3600 Joules 36 * 10^5Joules None Hint11). What degrades the Power factor? Harmonic Currents Improper Wirings Loading Variations All Mentioned Above None Hint12). What are the various categories of components in electric circuitry? Passive Devices Active Devices a & b Either a or b None Hint13). Electric current flow from low to high potential in ___________? Passive Devices Active Devices a & b Either a or b None Hint14). Electric energy converted to chemical or mechanical energies in ___________? Passive Devices Active Devices a & b Loads None Hint15). Electric current flow from high to low potential in ________? Passive Devices Active Devices a & b Power Source None Hint16). Passive components consume _______ power? Zero Positive Negative a & b None Hint17). Which law is combined with Joules for resistive type circuits? Faradays Law Ohms Law Kirchoff’s Law Norton’s Theorem None Hint18). What is the formula to calculate power for resistive loads? I^2 R VR IR V/I None Hint19). What is the energy-storing element in AC circuits? Inductor Capacitor Transformer a & b None Hint20). Electric power coming out from the circuit have __________? No Sign Positive Sign Negative Sign Equivalent Sign None Hint21). Inductors & capacitors dissipate __________ power? Zero Positive Negative a & b None Hint22). What are the various types of power? Real Power Reactive Power Apparent Power All Mentioned Above None Hint23). Electrical energy inside the coil is stored known as _________? Real Power Reactive Power Apparent Power All Mentioned Above None Hint24). What is the power consumed because of resistive loads? Real Power Reactive Power Apparent Power All Mentioned Above None Hint25). Which power describes the grid's capability of withstanding power? Real Power Reactive Power Apparent Power All Mentioned Above None HintElectric Power MCQs for Exams26). Apparent power is the product of _____ & _____ in the circuit? Voltage, Current Current, Resistance Resistance, Inductance Inductance, Capacitance None Hint27). What is the unit of Apparent power? Watts Joules Voltage-Ampere VAR None Hint28). What are the actual amounts of power dissipated or used in circuits? Real Power Reactive Power Apparent Power All Mentioned Above None Hint29). Which power is the function of circuit reactances? Real Power Reactive Power Apparent Power All Mentioned Above None Hint30). What is ‘Phantom Power’? Real Power Reactive Power Apparent Power All Mentioned Above None Hint31). The symbol Q represents ____________? Real Power Reactive Power Apparent Power All Mentioned Above None Hint32). What is the unit of Reactive power? Farads Joules Coulombs VAR None Hint33). Which letter indicates Apparent power? S R Q P None Hint34). Volt-Amps is the unit of _________? Real Power Reactive Power Apparent Power All Mentioned Above None Hint35). Electrical Power in a circuit is inverse in proportion to ________? Voltage Current Resistance Pressure None Hint36). A lamp with the voltage provided as 12 V & current of 4A. What is the power of the lamp? 24 W 36 W 48 W 56 W None Hint37). A generator worth 200 Volts is connected to a bulb with a current of 0.5 Amps. What is the bulb's power? 0 W 10 W 100 W 1000 W None Hint38). Work done/Time taken is the formula of __________? Electric Current Electric Voltage Electric Pressure Electric Power None Hint39). A bulb of 300 Volts with 100 ohms resistance. What is the consumed power? 300 W 600 W 900 W 1200 W None Hint40). What is the Power-energy formula? R/t E/t C/t I/t None Hint41). VQ/t is ___________? Electric Current Electric Voltage Electric Pressure Electric Power None Hint42). What happens to power in a circuit if the resistance is increased by maintaining the current as constant? Increases Decreases Neither Increase nor Decrease Remains Same None Hint43). What happens to power for lower resistance by maintaining V as constant? Increases Decreases Neither Increase nor Decrease Remains Same None Hint44). For constant potential differences the power will be low if resistance is ________? High Low Less Zero None Hint45). Electric power is ________? Vector Scalar Polar Bi-polar None Hint46). What is the main classification of Electric power? Dc Power Ac Power Circuit Power a & b None Hint47). Which power is produced by batteries? Dc Power Ac Power Circuit Power a & b None Hint48). In which power there is a periodic alteration in the direction? Dc Power Ac Power Circuit Power a & b None Hint49). What are the various classifications of AC power? Real Power Reactive Power Apparent Power All Mentioned Above None Hint50). How apparent power is expressed mathematically? Vrms*Irms Vmax*Imax cos θ Vrms*Irms sin θ Vmax*Imax None HintElectric Power MCQs for Interviews51). How to represent active power mathematically? Vrms*Irms Vmax*Imax cos θ Vrms*Irms sin θ Vmax*Imax None Hint52). How to represent reactive power mathematically? Vrms*Irms Vmax*Imax cos θ Vrms*Irms sin θ Vmax*Imax None Hint53). Active power gets dissipated in ____________ of the circuit? Voltage Current Resistance Pressure None Hint54). How active, apparent & reactive powers are related? S2 = Q + P S^2 = Q^2+P^2 S = Q + P S2 = Q2-P2 None Hint55). What is the Power factor? Real Power/Apparent Power Apparent Power/ Real Power Apparent Power/Reactive Power Reactive Power/Real Power None Hint56). Power factor lies in the range of ________? 0 to Infinity 0 to 1 -1 to Infinity 1 to Infinity None Hint57). Which power is useless in AC circuits? Real Power Reactive Power Apparent Power All Mentioned Above None Hint58). Which power is induced in any circuit if there is a lagging current behind the voltage applied? Real Power Reactive Power Apparent Power All Mentioned Above None Hint59). Which power is used to measure the value of the Power factor? Real Power Reactive Power Apparent Power All Mentioned Above None Hint60). How active power is measured? Ohm Meter Watt Meter VAR Meter Ammeter None Hint61). How the reactive power is measured? Ohm Meter Watt Meter VAR Meter Ammeter None Hint62). Heat in the heater is produced due to __________? Real Power Reactive Power Apparent Power All Mentioned Above None Hint63). Which power performs the work i.e., required in the circuit? Real Power Reactive Power Apparent Power All Mentioned Above None Hint64). What measures Electric power? Multimeter Ammeter Voltmeter Potentiometer None Hint65). What develops the torque in the motor? Real Power Reactive Power Apparent Power All Mentioned Above None Hint66). What is the total amount of power is generated in a Parallel connected circuit? Sum of Power Dissipated by Individual Resistors Product of Power Dissipated by Individual Resistors Ratio of Power Dissipated by Individual Resistors None None Hint67). Electric power dissipated in any series of circuits is dependent on ____________? Applied Supply Voltage Current Flow Temperature a & b None Hint68). What happens to power if the electric appliance is serially combined? Increases Decreases Neither Increase nor Decrease Remains Same None Hint69). What gets dissipated highly in a parallel combination of circuits? Electric Current Electric Voltage Electric Pressure Electric Power None Hint70). Parallel circuits consume more amount of __________? Electric Current Electric Voltage Electric Pressure Electric Power None Hint71). Transformer requires __________ for producing a magnetic field? Real Power Reactive Power Apparent Power All Mentioned Above None Hint72). Which currents are generated by Electric stations of power? Alternating Current Positive Current Negative Current Direct Current None Hint73). What is the frequency of Electric Power generated at the station? 0 Hz 25 Hz 50 Hz 100 Hz None Hint74). Electric power generated at the station transmits at __________? High Voltages Low Voltages Zero Voltage None None Hint75). What is the reason for generating power at 11 kV? Cheaper Costly Cost Too Much Energy is Lost None HintElectric Power MCQs for Students76). Why is the Electric power transmitted at higher voltages? Increase Efficiency Decrease Efficiency Maximize the Power Lost Transmitted for a Shorter Distance None Hint77). What happens to power if the voltage gets doubled? Decreases Doubled Tripled Quadrupled None Hint78). Electromechanical Generator produces ____________? Electric Current Electric Voltage Electric Pressure Electric Power None Hint79). Electric Power is produced in generators based on _____________? Faradays Law Ohms Law Kirchoff’s Law Norton’s Theorem None Hint80). What is the importance of Electrochemistry? Mobile Applications Batteries Portable Applications All Mentioned Above None Hint81). What is generated when fresh salt & water are merged? Electric Current Electric Voltage Electric Pressure Osmotic Power None Hint82). The chemical energy is converted to ____________ in batteries? Electric Current Electric Voltage Electric Pressure Electric Power None Hint83). Light is converted into Electric power or energy in ___________? Electric Generators Electrochemistry Batteries Photovoltaic Cells None Hint84). Heat engines generate ________? Electric Current Electric Voltage Electric Pressure Electric Power None Hint85). Water gets boiled with coal and produces __________? Electric Current Electric Voltage Electric Pressure Electric Power None Hint86). For what loads do the Power factor gets lag? Resistive Inductive No Loads Capacitive None Hint87). Which loads have a leading Power factor? Resistive Inductive No Loads Capacitive None Hint88). What happens to the power factor if voltage & current will be in-phase? Reaches 0 Become Unity Becomes Infinity None None Hint89). How kVA relates to Power Factor? Directly Proportional Inversely Proportional Independent None None Hint90). How electricity is important for health professionals? During Surgeries For Ventilators Storing Medicines All Mentioned Above None Hint91). The steam generated by the nuclear reactor produces ____________? Electric Current Electric Voltage Electric Pressure Electric Power None Hint92). What is the main intention of the Electric Power System? Maintain Continuous Power Supply Acceptable Quality of Power Power Supply can be Discontinuous a & b None Hint93). What is the main aim of Thermal power plants? Electric Current Electric Voltage Electric Pressure Electric Power None Hint94). Electric power systems that are capable of supplying power to confined region is _____________? Conductor Insulator Transformer Grid None Hint95). What are the main parts of an Electric Power System? Generators Transmission Lines Transformers All Mentioned Above None Hint96). How the Electric Power System is considered to be important? Ensure Robust Performance Maximize the Plant Availability Transient Losses are Reduced All Mentioned Above None Hint97). What are the stages involved in the supply of Electric Power? Generating Transmitting Distributing All Mentioned Above None Hint98). Why turbines are used? Electric Current Electric Voltage Electric Pressure Electric Power None Hint99). How is the power used for entertainment? Listening to Music Watching TV Movies Played on DVDs All Mentioned Above None Hint100). Transmission lines deliver ____________? Electric Current Electric Voltage Electric Pressure Electric Power None HintFor More MCQsRegulated DC Power Supply Question & Answers. Time's up
