Electric Power Question & Answers February 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 Hint 2). P is the letter indicates ___________? Electric Current Electric Voltage Electric Pressure Electric Power Hint Read More about Electric Power 3). What will be the SI units for power? Farads Ohms Watt Coulombs Hint 4). What SI units for Electrical energy? Farads Ohms Watt Joules Hint 5). Electric generators produce _________? Electric Current Electric Voltage Electric Pressure Electric Power Hint 6). How does the electrical energy utilized in factories is measured? Farads Joules Coulombs Kilowatt-hour Hint 7). 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 Hint 8). Which is not the electric power unit? Joule/Volts Watts Volt-Amp Joules/sec Hint 9). What is the formula of Electric Power? IR VR VI V/I Hint 10). How much is energy i.e., consumed by an appliance for 1kW 1 hr? 36 Joules 360 Joules 3600 Joules 36 * 10^5Joules Hint 11). What degrades the Power factor? Harmonic Currents Improper Wirings Loading Variations All Mentioned Above Hint 12). What are the various categories of components in electric circuitry? Passive Devices Active Devices a & b Either a or b Hint 13). Electric current flow from low to high potential in ___________? Passive Devices Active Devices a & b Either a or b Hint 14). Electric energy converted to chemical or mechanical energies in ___________? Passive Devices Active Devices a & b Loads Hint 15). Electric current flow from high to low potential in ________? Passive Devices Active Devices a & b Power Source Hint 16). Passive components consume _______ power? Zero Positive Negative a & b Hint 17). Which law is combined with Joules for resistive type circuits? Faradays Law Ohms Law Kirchoff’s Law Norton’s Theorem Hint 18). What is the formula to calculate power for resistive loads? I^2 R VR IR V/I Hint 19). What is the energy-storing element in AC circuits? Inductor Capacitor Transformer a & b Hint 20). Electric power coming out from the circuit have __________? No Sign Positive Sign Negative Sign Equivalent Sign Hint 21). Inductors & capacitors dissipate __________ power? Zero Positive Negative a & b Hint 22). What are the various types of power? Real Power Reactive Power Apparent Power All Mentioned Above Hint 23). Electrical energy inside the coil is stored known as _________? Real Power Reactive Power Apparent Power All Mentioned Above Hint 24). What is the power consumed because of resistive loads? Real Power Reactive Power Apparent Power All Mentioned Above Hint 25). Which power describes the grid's capability of withstanding power? Real Power Reactive Power Apparent Power All Mentioned Above Hint Electric Power MCQs for Exams 26). Apparent power is the product of _____ & _____ in the circuit? Voltage, Current Current, Resistance Resistance, Inductance Inductance, Capacitance Hint 27). What is the unit of Apparent power? Watts Joules Voltage-Ampere VAR Hint 28). What are the actual amounts of power dissipated or used in circuits? Real Power Reactive Power Apparent Power All Mentioned Above Hint 29). Which power is the function of circuit reactances? Real Power Reactive Power Apparent Power All Mentioned Above Hint 30). What is ‘Phantom Power’? Real Power Reactive Power Apparent Power All Mentioned Above Hint 31). The symbol Q represents ____________? Real Power Reactive Power Apparent Power All Mentioned Above Hint 32). What is the unit of Reactive power? Farads Joules Coulombs VAR Hint 33). Which letter indicates Apparent power? S R Q P Hint 34). Volt-Amps is the unit of _________? Real Power Reactive Power Apparent Power All Mentioned Above Hint 35). Electrical Power in a circuit is inverse in proportion to ________? Voltage Current Resistance Pressure Hint 36). 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 Hint 37). 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 Hint 38). Work done/Time taken is the formula of __________? Electric Current Electric Voltage Electric Pressure Electric Power Hint 39). A bulb of 300 Volts with 100 ohms resistance. What is the consumed power? 300 W 600 W 900 W 1200 W Hint 40). What is the Power-energy formula? R/t E/t C/t I/t Hint 41). VQ/t is ___________? Electric Current Electric Voltage Electric Pressure Electric Power Hint 42). 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 Hint 43). What happens to power for lower resistance by maintaining V as constant? Increases Decreases Neither Increase nor Decrease Remains Same Hint 44). For constant potential differences the power will be low if resistance is ________? High Low Less Zero Hint 45). Electric power is ________? Vector Scalar Polar Bi-polar Hint 46). What is the main classification of Electric power? Dc Power Ac Power Circuit Power a & b Hint 47). Which power is produced by batteries? Dc Power Ac Power Circuit Power a & b Hint 48). In which power there is a periodic alteration in the direction? Dc Power Ac Power Circuit Power a & b Hint 49). What are the various classifications of AC power? Real Power Reactive Power Apparent Power All Mentioned Above Hint 50). How apparent power is expressed mathematically? Vrms*Irms Vmax*Imax cos θ Vrms*Irms sin θ Vmax*Imax Hint Electric Power MCQs for Interviews 51). How to represent active power mathematically? Vrms*Irms Vmax*Imax cos θ Vrms*Irms sin θ Vmax*Imax Hint 52). How to represent reactive power mathematically? Vrms*Irms Vmax*Imax cos θ Vrms*Irms sin θ Vmax*Imax Hint 53). Active power gets dissipated in ____________ of the circuit? Voltage Current Resistance Pressure Hint 54). How active, apparent & reactive powers are related? S2 = Q + P S^2 = Q^2+P^2 S = Q + P S2 = Q2-P2 Hint 55). What is the Power factor? Real Power/Apparent Power Apparent Power/ Real Power Apparent Power/Reactive Power Reactive Power/Real Power Hint 56). Power factor lies in the range of ________? 0 to Infinity 0 to 1 -1 to Infinity 1 to Infinity Hint 57). Which power is useless in AC circuits? Real Power Reactive Power Apparent Power All Mentioned Above Hint 58). 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 Hint 59). Which power is used to measure the value of the Power factor? Real Power Reactive Power Apparent Power All Mentioned Above Hint 60). How active power is measured? Ohm Meter Watt Meter VAR Meter Ammeter Hint 61). How the reactive power is measured? Ohm Meter Watt Meter VAR Meter Ammeter Hint 62). Heat in the heater is produced due to __________? Real Power Reactive Power Apparent Power All Mentioned Above Hint 63). Which power performs the work i.e., required in the circuit? Real Power Reactive Power Apparent Power All Mentioned Above Hint 64). What measures Electric power? Multimeter Ammeter Voltmeter Potentiometer Hint 65). What develops the torque in the motor? Real Power Reactive Power Apparent Power All Mentioned Above Hint 66). 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 Hint 67). Electric power dissipated in any series of circuits is dependent on ____________? Applied Supply Voltage Current Flow Temperature a & b Hint 68). What happens to power if the electric appliance is serially combined? Increases Decreases Neither Increase nor Decrease Remains Same Hint 69). What gets dissipated highly in a parallel combination of circuits? Electric Current Electric Voltage Electric Pressure Electric Power Hint 70). Parallel circuits consume more amount of __________? Electric Current Electric Voltage Electric Pressure Electric Power Hint 71). Transformer requires __________ for producing a magnetic field? Real Power Reactive Power Apparent Power All Mentioned Above Hint 72). Which currents are generated by Electric stations of power? Alternating Current Positive Current Negative Current Direct Current Hint 73). What is the frequency of Electric Power generated at the station? 0 Hz 25 Hz 50 Hz 100 Hz Hint 74). Electric power generated at the station transmits at __________? High Voltages Low Voltages Zero Voltage None Hint 75). What is the reason for generating power at 11 kV? Cheaper Costly Cost Too Much Energy is Lost Hint Electric Power MCQs for Students 76). Why is the Electric power transmitted at higher voltages? Increase Efficiency Decrease Efficiency Maximize the Power Lost Transmitted for a Shorter Distance Hint 77). What happens to power if the voltage gets doubled? Decreases Doubled Tripled Quadrupled Hint 78). Electromechanical Generator produces ____________? Electric Current Electric Voltage Electric Pressure Electric Power Hint 79). Electric Power is produced in generators based on _____________? Faradays Law Ohms Law Kirchoff’s Law Norton’s Theorem Hint 80). What is the importance of Electrochemistry? Mobile Applications Batteries Portable Applications All Mentioned Above Hint 81). What is generated when fresh salt & water are merged? Electric Current Electric Voltage Electric Pressure Osmotic Power Hint 82). The chemical energy is converted to ____________ in batteries? Electric Current Electric Voltage Electric Pressure Electric Power Hint 83). Light is converted into Electric power or energy in ___________? Electric Generators Electrochemistry Batteries Photovoltaic Cells Hint 84). Heat engines generate ________? Electric Current Electric Voltage Electric Pressure Electric Power Hint 85). Water gets boiled with coal and produces __________? Electric Current Electric Voltage Electric Pressure Electric Power Hint 86). For what loads do the Power factor gets lag? Resistive Inductive No Loads Capacitive Hint 87). Which loads have a leading Power factor? Resistive Inductive No Loads Capacitive Hint 88). What happens to the power factor if voltage & current will be in-phase? Reaches 0 Become Unity Becomes Infinity None Hint 89). How kVA relates to Power Factor? Directly Proportional Inversely Proportional Independent None Hint 90). How electricity is important for health professionals? During Surgeries For Ventilators Storing Medicines All Mentioned Above Hint 91). The steam generated by the nuclear reactor produces ____________? Electric Current Electric Voltage Electric Pressure Electric Power Hint 92). 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 Hint 93). What is the main aim of Thermal power plants? Electric Current Electric Voltage Electric Pressure Electric Power Hint 94). Electric power systems that are capable of supplying power to confined region is _____________? Conductor Insulator Transformer Grid Hint 95). What are the main parts of an Electric Power System? Generators Transmission Lines Transformers All Mentioned Above Hint 96). How the Electric Power System is considered to be important? Ensure Robust Performance Maximize the Plant Availability Transient Losses are Reduced All Mentioned Above Hint 97). What are the stages involved in the supply of Electric Power? Generating Transmitting Distributing All Mentioned Above Hint 98). Why turbines are used? Electric Current Electric Voltage Electric Pressure Electric Power Hint 99). How is the power used for entertainment? Listening to Music Watching TV Movies Played on DVDs All Mentioned Above Hint 100). Transmission lines deliver ____________? Electric Current Electric Voltage Electric Pressure Electric Power Hint For More MCQs Regulated DC Power Supply Question & Answers. Time's up