Homework Answers
Voltage levels on an electrical transmission grid are changes by means of transformers. With the help of chenging the voltage levels we can reduce the copper loss of transmission lines and hence increasing its efficiency. 'Transformers' is the correct answer.
At the consumer end, we use voltage levels of 110-240V AC. Generating station voltage ranges from 11KV to 25KV AC. So we use very low AC voltage levels.
QUESTION 12: Heat can be obtained from both fossil fuels as well as nuclear fusion. Both 'a' and 'b' is correct.
QUESTION 13: Hydroelectric generating stations are most cheast and environment friendly as it release lesser harmfull gases.
QUESTION 2: the statement is True. As power P = constant, we know P = V*I. Where V: volatge and I:current. As V*I = constant if Vincreases I have to reduce and vice versa. So statement is true as toaster draws more current thab
QUESTION 3: Current drawn by toaster, I = 1200/120Amps = 10Amps And current drawn by television reciever I = 420/120Amps = 3.75Amps. So statement is true as toaster draws more current than television reciever.
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Voltage levels on an electrical transmission grid system are changed by means of: O generators. alternators....
QUESTION 1 If electric power is to be transmitted any great distance, a step down transformer...
QUESTION 1 If electric power is to be transmitted any great distance, a step down transformer is connected to the generator to decrease the voltage before it is connected to the transmission line. True False QUESTION 2 The same electric power can be obtained by low voltage with high current or by high voltage with low current True False QUESTION 3 A 1200-W toaster draws more current from a 120-V power line than a 450-W television receiver. True False QUESTION...
QUESTION 12 The heat used to power thermal-electric generating stations is obtained from: fossil fuels such...
QUESTION 12 The heat used to power thermal-electric generating stations is obtained from: fossil fuels such as coal, oil, or natural gas O nuclear fusion the sun both a and b QUESTION 13 The cheapest and most environmentally-safe type of generating station is: a hydroelectric generating station. O a nuclear power generating station. a coal power generating station. a natural gas power generating station. QUESTION 1 If electric power is to be transmitted any great distance, a step-down transformer is...
QUESTION 15 Transmitting electrical energy from the generating station to the consumer usually takes place at:...
QUESTION 15 Transmitting electrical energy from the generating station to the consumer usually takes place at: O very high AC-voltage levels. O very high DC-voltage levels. O very low AC-voltage levels. O very low AC-voltage levels. QUESTION 16 Voltage levels on an electrical transmission grid system are changed by means of: generators. O alternators. transformers. rectifiers. QUESTION 20 The generator principle is based on the fact that: O voltage is induced in a conductor whenever it is placed in a...
QUESTION 8 When connecting any electrical AC generator to an electrical grid, the frequency, phase, and...
QUESTION 8 When connecting any electrical AC generator to an electrical grid, the frequency, phase, and voltage of the generator's final electrical output must match that of the grid. ○True ○ False QUESTION 9 As discussed in class, Inverters convert AC power to DC and Rectifiers convert DC to AC. Both are used in fully-rated power electronics in wind turbines to convert power from the stator and DC generator to the correct voltage and phase of the grid. O True...
2- The Electrical System Unit 14 14.5 Premises Ground-Fault Current Path 14.8 Conductor Power Los Metal...
2- The Electrical System Unit 14 14.5 Premises Ground-Fault Current Path 14.8 Conductor Power Los Metal parts of premises wiring must be bonded to a low medance path designed so that the circuit protection device will quickly open and clear a ground fault 12 Conductor poner losses are directly proporional tl le lengh of the conaco and the areofthe cnrt duce the line- aused by the current is doubled, the power loss will be increased by a) True -percent al...
Introduction to Electrical Systems and Chapter 1 1. What is voltage? A. The force that causes...
Introduction to Electrical Systems and Chapter 1 1. What is voltage? A. The force that causes a circuit to energize. B. The force that works against resistance. C. The force that pushes electrons through the circuit. D. The force that causes heating and movement in electrical equipment. 2. What can cause death when a person is electrocuted? A. The electric shock stops the lungs from working B. The electric shock stops brain functions. C. Stops the heart or creates an...
CODE 102_8 Welding Many welding processes require the application of heat and/or pressure to produce a...
CODE 102_8 Welding Many welding processes require the application of heat and/or pressure to produce a suitable bond between the two parts being joined. There are a number of conventional and commercially practiced welding processes, which possess limitations in relation to material type and thickness, and in addition, the cost analysis may not allow for a process to be used on a specific application. The selection of suitable welding consumable (electrode or wire) is also an important factor in producing...
My Courses Week 2 Assignment(s) Week 2 Assignment(s) Assignment 2 Power Markets have two subcateg...
My Courses Week 2 Assignment(s) Week 2 Assignment(s) Assignment 2 Power Markets have two subcategories: generation and grid ancillary services (page 113). Text box 2-2a (page 101) describes grid ancillary services and text box 2-2b (page 102) describes essential reliability services. Create a table which lists the grid ancillary services with services as the rows and resources (hydropower, solar, and wind) as columns. In the respective row/column box summarize if the resource can provide the service, with a bottom line...
Chose the correct answer(s) from the multiple choice lists below 1. Exergy of a system is a) b) always increasing e) guided by the first and second laws of thermodynamics for reversible proce...
Chose the correct answer(s) from the multiple choice lists below 1. Exergy of a system is a) b) always increasing e) guided by the first and second laws of thermodynamics for reversible processes only Un d) limited by the second law of thermodynamics for all processes. processes, it is destroyed partly or completely). e) equal to the Gibs free energy of the system. 211two electrodes, one made of u (E.-3.06 V) and another made of Cu ΟΕ.+034V placed in an...
2% SECTION I Principles of Radiation t, when passed SUMMARY- cont'd transformes, becc s the The...
2% SECTION I Principles of Radiation t, when passed SUMMARY- cont'd transformes, becc s the The aand the electronic times is the most sop H chamber thar is placed betwen located in change). In the United States the olectricity The relatiomshi been volage, current, timer is genes enargh Om's l,which sas that the terminates exposire (ske a timer (otape) across the sotall circuit or a part e hatnqual to the current (amperes) va of the c n ustor deyvads on...
QUESTION 1 If electric power is to be transmitted any great distance, a step down transformer is connected to the generator to decrease the voltage before it is connected to the transmission line. True False QUESTION 2 The same electric power can be obtained by low voltage with high current or by high voltage with low current True False QUESTION 3 A 1200-W toaster draws more current from a 120-V power line than a 450-W television receiver. True False QUESTION...
QUESTION 12 The heat used to power thermal-electric generating stations is obtained from: fossil fuels such as coal, oil, or natural gas O nuclear fusion the sun both a and b QUESTION 13 The cheapest and most environmentally-safe type of generating station is: a hydroelectric generating station. O a nuclear power generating station. a coal power generating station. a natural gas power generating station. QUESTION 1 If electric power is to be transmitted any great distance, a step-down transformer is...
QUESTION 15 Transmitting electrical energy from the generating station to the consumer usually takes place at: O very high AC-voltage levels. O very high DC-voltage levels. O very low AC-voltage levels. O very low AC-voltage levels. QUESTION 16 Voltage levels on an electrical transmission grid system are changed by means of: generators. O alternators. transformers. rectifiers. QUESTION 20 The generator principle is based on the fact that: O voltage is induced in a conductor whenever it is placed in a...
QUESTION 8 When connecting any electrical AC generator to an electrical grid, the frequency, phase, and voltage of the generator's final electrical output must match that of the grid. ○True ○ False QUESTION 9 As discussed in class, Inverters convert AC power to DC and Rectifiers convert DC to AC. Both are used in fully-rated power electronics in wind turbines to convert power from the stator and DC generator to the correct voltage and phase of the grid. O True...
2- The Electrical System Unit 14 14.5 Premises Ground-Fault Current Path 14.8 Conductor Power Los Metal parts of premises wiring must be bonded to a low medance path designed so that the circuit protection device will quickly open and clear a ground fault 12 Conductor poner losses are directly proporional tl le lengh of the conaco and the areofthe cnrt duce the line- aused by the current is doubled, the power loss will be increased by a) True -percent al...
Introduction to Electrical Systems and Chapter 1 1. What is voltage? A. The force that causes a circuit to energize. B. The force that works against resistance. C. The force that pushes electrons through the circuit. D. The force that causes heating and movement in electrical equipment. 2. What can cause death when a person is electrocuted? A. The electric shock stops the lungs from working B. The electric shock stops brain functions. C. Stops the heart or creates an...
CODE 102_8 Welding Many welding processes require the application of heat and/or pressure to produce a suitable bond between the two parts being joined. There are a number of conventional and commercially practiced welding processes, which possess limitations in relation to material type and thickness, and in addition, the cost analysis may not allow for a process to be used on a specific application. The selection of suitable welding consumable (electrode or wire) is also an important factor in producing...
My Courses Week 2 Assignment(s) Week 2 Assignment(s) Assignment 2 Power Markets have two subcategories: generation and grid ancillary services (page 113). Text box 2-2a (page 101) describes grid ancillary services and text box 2-2b (page 102) describes essential reliability services. Create a table which lists the grid ancillary services with services as the rows and resources (hydropower, solar, and wind) as columns. In the respective row/column box summarize if the resource can provide the service, with a bottom line...
Chose the correct answer(s) from the multiple choice lists below 1. Exergy of a system is a) b) always increasing e) guided by the first and second laws of thermodynamics for reversible processes only Un d) limited by the second law of thermodynamics for all processes. processes, it is destroyed partly or completely). e) equal to the Gibs free energy of the system. 211two electrodes, one made of u (E.-3.06 V) and another made of Cu ΟΕ.+034V placed in an...
2% SECTION I Principles of Radiation t, when passed SUMMARY- cont'd transformes, becc s the The aand the electronic times is the most sop H chamber thar is placed betwen located in change). In the United States the olectricity The relatiomshi been volage, current, timer is genes enargh Om's l,which sas that the terminates exposire (ske a timer (otape) across the sotall circuit or a part e hatnqual to the current (amperes) va of the c n ustor deyvads on...
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