Power Systems Question & Answers September 1, 2021 By Wat Electrical Leave a Comment This article lists 100 Power Systems MCQs for engineering students. All the Power Systems Questions & Answers given below includes solution and link wherever possible to the relevant topic. A power system is an environment in which a number of electrical appliances are interconnected to generate, transmit and utilize power. The first power system was designed in the year 1881 in England. The purpose of the design of a power system is to basically generate huge Watts of power and transmit to the sub-power station, and from the sub-power station, the power is again divided and sent for application stations which can be industries, houses, hospitals, etc. These power systems mainly consist of a transformer, circuit breaker, motor, generators, etc which generate the bulk of electric power for transmission purposes. Small accidents in a power station can bloom the entire environment, hence these stations are built at distance away from domestic areas. Electrical accidents in domestic areas such as a house, offices, etc can be defended using electric protectors such as a fuse. The benefits provided by a power system are they are reliable, exhibits diversity factor, and generates sufficient power depending on the design. 1). How many stages does the power system comprise? 2 3 4 5 Hint 2). Which of the following is a resource for generation of electric power? Coal Petrol Diesel All the above Hint 3). Which of the following are the resource components of a power systems? Transformer Motor Circuit breakers All the above Hint 4). Which of the following is main resource of power generation in power systems? Power plant Transformer Inverter Battery Hint 5). Which of the following component of power system is responsible for sending power from one circuit to another electric circuit? Power plant Transformer Inverter Battery Hint 6). Which of the following medium of power system is responsible for sending power to network sub stations? Power plant Transformer Transmission lines Battery Hint 7). Which of the following are the reason for electric power system break down? Fault in wiring Not using equipment properly Over usage of equipment All the above Hint 8). Which of the following are the safety principles provided by Bureau of Indian Standard for workers in electrical environment? Safety Energy based efficient usage Use enhance technology All the above Hint 9). Which of the following is the electrical task that codes "IS -732", during testing of wiring based system? Installation Earthing Altering current based system None of the above Hint 10). Which of the following is the electrical task that codes "IS -3043 (1987)", for electrical installation? Installation Earthing Altering current based system None of the above Hint 11). Which of the following is the electrical task that codes "IS -3043 (1993)", for electro based technical surge arresters? Installation Earthing Altering current based system None of the above Hint 12). What happens to electrical power machine when voltage falls suddenly to low value? Damages Runs at high speed Runs slow None of the above Hint 13). How much percentage of fault is observed on a line to ground based fault of power system? 50% 30% 60 to 70% 90% Hint 14). Which of the following are the reasons for heavy load condition in power system? Excessive usage of extension based cords on one circuit Excessive usage of number of plug in adapters on same circuit Executing multiple application at a single time All the above Hint 15). Which of the following are the signs of low type voltage based overloading in electrical appliances? Arise of sparks from sockets or appliances Dimming of bulbs and lights Reduction in speed of motor All the above Hint 16). Which of the following incident avoiding components are used for preventing voltage based overloading accidents? Fuse Miniatures Copper wires Both a and b Hint 17). Which of the following component of electric appliance is required to be protected from high based current? CU wires Wood Cotton All the above Hint 18). On which of the following factors do conductors in an electrical appliance depend on? Structure Material Medium All the above Hint 19). Which of the following are conducting elements? Copper Paper Wood Rubber Hint Read more about Conductors. 20). Which of the following is an insulator? Copper Styrofoam Graphite Water Hint 21). Which of the following is the primary parameter to be considered while selecting a fuse in electric circuit? Size of cable Speed of operation Load used All the above Hint 22). What happens to fuse when fault type current hits fuse? Allows current to flow Breaks the fuse Short circuits All the above Hint 23). Which of the following are the classification of AC system for a SC based protection system? Pole through GND contact Pole to pole contact Phase through GND contact All the above Hint 24). Which of the following are the classification of DC system for a SC based protection system? Pole through GND contact Pole to pole contact Phase through GND contact Both a and b Hint 25). Which of the following are the reasons for thermal effect on conducting element resulting in short circuit? Conductors contact points melting Insulation damage Production of electrical type arcs All the above Hint Power Systems MCQs With Answers 26). Which of the following is the reason for electro dynamic based short circuit? Cuts between conductors Contactors repulsion Disturbance in windings All the above Hint 27). Which of the following can overcome thermodynamic and thermal based effects in an electrical appliances? Molded based case type circuit breaker Molded based case of switch type circuit breaker Vacuum type circuit breaker All the above Hint 28). Which of the following are low type voltage fuse? Re-wirable fuse Switch base fuse Drop out fuse All the above Hint 29). Which of the following are high type voltage fuses? Catridge based HRC fuse Liquid based HRC fuse Expulsion based HRC fuse All the above Hint Read more about HRC Fuse. 30). Which of the following are the class of catridge based fuse? D fuse Link fuse Liquid fuse Both a and b Hint 31). Which of the following are general applications of fuse? Laptops Gaming consoles Home appliances All the above Hint 32). Which of the following are the advantages of power systems? Reliable Diversity factor Generates sufficient power depending on design All the above Hint 33). Which of the following are the disadvantages of power system? Frequent circuit break down Cannot operate at higher current Creates synchronizing problem All the above Hint 34). Which of the following are short type circuit protection characteristics? Breaking type capacity Closing type capacity Fusing Both a and b Hint 35). Which of the following are classification of earth type fault? Earth fault type relay Earth leakage type circuit breaker Ground fault type circuit interpreter All the above Hint Read more about Electrical Earthing. 36). Which of the following protects users from shock coming from electrical appliance? Earth fault type relay Earth leakage type circuit breaker Ground fault type circuit interpreter All the above Hint 37). Which of the following are the methods of neutral type earthing? Resonant type earthing system Earthing type transformer earthing Solid type neutral earthed type system All the above Hint Read more about Earthing. 38). Which of the following are the reason for earthing an electrical appliance? Protect from shocks Safety measure in case of insulation failure showing path to fault circuit Protects from high voltage All the above Hint 39). Which of the following is the function of power supply in electric appliances? Convert the actual input current to required load current Convert the actual input current to maximum than required by load current Convert the actual input current to minimum than required by load current None of the above Hint 40). Which of the following category of power supply sends static direct current type voltage to added load? DC type power supply AC-to-DC type power supply Switched mode type power supply AC type power supply Hint 41). Which of the following type of power supply allows AC type energy to pass DC type power using rectifier component? DC type power supply AC-to-DC type power supply Switched mode type power supply AC type power supply Hint 42). Which of the following are the components used in AC-to-DC type power supply? Rectifier Filter Register All the above Hint Read more about AC-to-DC type power supply. 43). Which of the following source is used in DC type power supply systems to pass power to appliances? AC type source DC type source AC-DC source Either AC or DC Hint 44). What is the abbreviation of SMPS in terms of power systems? Switched Mode Power Supply Switch Managed Power Supply Suite Mode Power Supply None of the above Hint Read more about SMPS. 45). Which of the following is the function of SMPS? Converts main input to direct current type voltage Filters voltage Switches at higher frequency All the above Hint 46). Which of the following are the components of SMPS? Switch Rectifier Filter Power safety device All the above Hint Read more about Rectifier. 47). At what frequency does SMPS switches? 10 KHz to 1 MHz 1KHz – 10 MHz 0KHz – 9 KHz 1KHz – 10 KHz Hint 48). Which of the following is the function of linear type regulator? Converts fluctuating DC type voltage to a constant value Converts fluctuating AC type voltage to a constant value Converts fluctuating DC type voltage to 0 Converts fluctuating DC type voltage to infinity Hint 49). A current based limiting functionality of linear type regulator protects from _________. Power supply Shocks Over voltage None of the above Hint Read more about Power Supply. 50). A current based limiting functionality of linear type regulator protects electrical appliances load from ________. Power supply Over current Over voltage None of the above Hint Power Systems MCQs With Answers 51). Which of the following are the sources of AC type power supply? Step up type transformer Step down type transformer Ideal transformer Both a and b Hint Read more about Types of Transformers. 52). Which of the following phases are included in a AC type power supply? Single Two Three Both a and c Hint 53). What is the function of programmable type power supply? Allows remote type control operation Uses analog input Uses RS232 All the above Hint 54). Which of the following electrical properties are controlled in programmable type power supply? Voltage Current Frequency All the above Hint 55). Which of the following is function of un-interruptible type power supply in electrical appliance? Consumes power from multiple sources Acts as a battery Fast in supplying power to load All the above Hint 56). Which of the following is the function of high voltage type power supply? Delivers huge energy to appliances Generates high voltage Acts as a battery Both a and b Hint 57). Which of the following is the range of high voltage type power supply? 20 KV Greater than 20 KV 10 Kv 5Kv Hint 58). Which of the following are the properties of a power supply? Protections Load regulation Efficiency All the above Hint 59). Which of the following do not include power supply property? Ripple factor Efficiency Trip time Load regulation Hint 60). Which of the following are the types of cables used in electrical systems? Metallic type cables Non metallic type cables Multi type conductor cable All the above Hint 61). Which of the following is the design property of non metallic cable? Contains up to four wires Contains flexible type plastic based jackets Contains cross linked type polyethylene Both a and b Hint 62). Which of the following are the applications of non metallic type cable? Underground cabling Outdoor type cabling Indoor type cabling high stress installation Both a and b Hint 63). Which of the following are the properties of underground feeder type cables? Joined as single set of wires Embedded within flexible materials Contains single wire Both a and b Hint 64). Which of the following are the applications of underground feeder type cables? Inground cabling Outdoor type lightning systems Indoor type cabling high stress installation Both a and b Hint 65). Which of the following material is used for metallic type sheathed cable in electrical system? Polymer Polyethylene PVC Both b and c Hint 66). Which of the following are the applications of metallic type sheathed cable in electrical system? Highly based stress type installation Outdoor type lightning systems Indoor type cabling high stress installation Both a and b Hint 67). A coaxial cable is know as ________. Heliax type cable RF cable BX cable Both a and b Hint 68). Which of the following are the applications of coaxial type cable in electrical appliances? TV signal carrying cables Video equipment’s Audio cables All the above Hint 69). Which of the following cable is similar to twisted type pair cable? Paired type cable Twin type lead cable Direct based buried type cable Both b and c Hint 70). Which of the following is the thermal conductivity value of copper? 400 100 200 350 Hint 71). Which of the following is the thermal conductivity value of an insulator XLPE? 0.3232 1.2020 2.20 3.50 Hint 72). Which of the following material is cross type link material used for metallic type sheathed cable? PVC AL Cu Polyethylene Hint 73). What is the relation between cable temperature and thermal conductivity? Directly Inversely Becomes zero Becomes constant at a value Hint 74). Which of the following is the range of electrical power systems? 11Kv to 25Kv 5Kv 10Kv 50Kv Hint 75). Power plants are classified into ________ types. 2 3 4 5 Hint Power Systems Important Questions for Interviews 76). Which of the following are the main components of generating type system? Transformer Generator Wires Both a and b Hint Read more about Generator. 77). Which of the following transformer has minimum losses? Step up Step down Ideal All the above Hint 78). Which of the following are the functions of transmission lines? Transmits energy from generating type station to huge receiver station Joins multiple generating type stations Sends power to nearby station Both a and b Hint 79). Which of the following is the operating power for transmission voltage 66kv? 69KV 345KV 765KV All the above Hint 80). What is the voltage value for extra high type voltage? 230KV 180KV 300KV 150KV Hint 81). When the sub part of transmission system connecting high type voltage based substation with step down type transformer and distribution type substation is _____ system. Sub transmission type system Transmission system Base system All the above Hint 82). Which of the following is the voltage range for sub transmission type voltage level? 90 to 138KV 70KV to 100 KV 60KV to 100KV All the above Hint 83). Which of the following are AC appliances? AC Refrigerators Pumps All the above Hint Read more about Pumps. 84). Which of the following is the principle of a transformer? Faradays law Ohms law Maxwell law None of the above Hint 85). Which of the following transformer has maximum output? Step up Step down Ideal None of the above Hint 86). Which transformer has more windings on secondary than primary? Step up Step down Ideal None of the above Hint 87). Which transformer has more windings on primary than secondary? Step up Step down Ideal None of the above Hint 88). Which of the following transformer has primary and secondary type windings on non magnetic type strip? Air core type Iron core type Both a and b None of the above Hint 89). Which of the following transformer has primary and secondary type windings on multiple iron type plate bunch? Air core type Iron core type Both a and b None of the above Hint 90). What is the voltage of power type transformer? 33kv 22kv 0KV 100KV Hint 91). Which of the following is the application of power transformer? Transmission type substation Power generation type station Ground base station Both a and b Hint 92). What is the characteristic of distribution type transformer? Minimum size Easy setup Works at 50-70 percent efficiency All the above Hint Read more about Distribution Transformer. 93). Voltage type transformer also called as ________. Potential type transformer Current type transformer Single winded transformer All the above Hint 94). What is the SI unit of power? Watts Joule dBm All the above Hint 95). What is the unit of force? Newton Centimeter Meter All the above Hint 96). What is the SI unit of a capacitor? Farads Ohms Henry All the above Hint Read more about Capacitor. 97). What is the unit of a resistor? Farads Ohms Henry All the above Hint Read more about Resistor. 98). What is the unit of an inductor? Farads Ohms Henry All the above Hint 99). What is the formula for Ohms law? V=IR V=0 V=G V= infinity Hint 100). What is the formula of power? P=VI P=0 P=R None of the above Hint 101). Which of the following limits electro type dynamic stress effects in an electrical appliances? Molded based case type circuit breaker Molded based Case of switch type circuit breaker Vacuum type circuit breaker Fuse Hint 2 3 4 5 Hint Installation Earthing Altering current based system None of the above Hint Installation Earthing Altering current based system None of the above Hint Read more about <a href="https://www.watelectrical.com/what-is-a-resistor-construction-properties-and-its-applications/" target="_blank" rel="noopener">Resistor</a>. Time is Up! Time's up
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