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9. Sketch a single-phase 120/240 V service to supply the following branch circum Use circuit breakers...
3. An electric motor draws 2238 W and 12 A when operating on a 240 V source. Determine the (a) Po...
3. An electric motor draws 2238 W and 12 A when operating on a 240 V source. Determine the (a) Power factor of the motor. (b) Apparent power input to motor. (c) True power input to motor. (d) Horsepower output of the motor if it is 75% efficient. 4 The follwing s found on the nameplate of a motor. 3 hp 60 Hz 1 phase 120/240 V 34/17 A 1,740 RPM irthe power factor of the motor is 0.30, what...
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8...
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8 kVA resistive load (i.e., the load has a power factor of 1.0) at rated voltage of 120 V a) If you assume the transformer is ideal, what would be the magni- tude of the expected primary side (240 V side) current? b) Again, if you assume the transformer is ideal, what is the apparent impedance of the load viewed from the high-voltage side of...
Given: 100kVA single phase transformer, Z=1.5% Primary: 480V 2 wire Secondary: 120/240V 3 wire Install the...
Given: 100kVA single phase transformer, Z=1.5% Primary: 480V 2 wire Secondary: 120/240V 3 wire Install the above transformer to serve a branch circuit panelboard. The panelboard will be located 10' from the transformer. The primary side raceway is PVC and the secondary raceway is EMT. All calculations will conform to applicable NEC regulations. The primary side, overcurrent protection device, will be chosen based on the next available standard size of the full load amps of the transformer. The secondary side,...
Problem #4-The primaries of two ideal 240/120 v, 60 Hz single phase transformers are connected in...
Problem #4-The primaries of two ideal 240/120 v, 60 Hz single phase transformers are connected in series and the combination is fed from a 480 v supply. The secondary of one transformer is connected to a resistance of 10 ohms and the secondary of the other to a resistance of 20 ohms. a-Calculate the currents in the two resistors. b-How does the 480 v divide between the primaries of the two transformers?
Q6) A 3-phase A/Y transformer is assembled by connecting three 830-VA, 240/120-V single phase transformers. Each...
Q6) A 3-phase A/Y transformer is assembled by connecting three 830-VA, 240/120-V single phase transformers. Each transformer parameters are as follow: Rp 15.5 ,Xp18.2 Q, Rcp 6.54 k2, XMp = 4.64 k Rs 2.4 , Xs2.8 a) Determine the 3-phase transformer bank's ratings (voltages and power). b) Draw the winding arrangements, equivalent Y/Y connections, and per-phase equivalent circuit
06) A 3-phase A/Y transformer is assembled by connecting three 830-VA, 240/120-V single phase transformers. Each...
06) A 3-phase A/Y transformer is assembled by connecting three 830-VA, 240/120-V single phase transformers. Each transformer parameters are as follow: R,-15.5 Ω . X,-18.2 Ω , ROF 6.54k Rs 2.4 Ω . Xs-2.8 Ω . XMP-4.64 Ω a) Determine the 3-phase transformer bank's ratings (voltages and power). b) Draw the winding arrangements, equivalent Y/Y connections, and per-phase equivalent circuit
7. on. Suppose an engineer designs a 120/240 Volt single phase power system for a restaurant...
7. on. Suppose an engineer designs a 120/240 Volt single phase power system for a restaurant including the indoor wiring circuits. He had some conversations with the restaurant owner prior to completing his final design but the owner was not very organized so only shared the other kitchen equipment technical specs by telephone. The restaurant hired an electrician to install the kitchen equipment and inside wiring. However, when the owner met with the electrician he found the kitchen oven to...
The amount of available fault current at the service depends upon the ______. Method of banding...
The amount of available fault current at the service depends upon the ______. Method of banding Method of grounding Size and impendence of the service transformer Ampere rating of the overcurrent protection device The line current for a 240/120 volt, 3-phrase system, if each phase is balanced with a 3,000-VA load and the total load is 9,000 VA, is ______ amperes. 12.5 15 21.65 37.5 Given: A dwelling unit has 3,000 sq.ft. of habitable space with laundry facilities and bathrooms,...
Fig. 1. Single-phase ac circuit 52 j10Ω 100sin3771+9) Load 5 +j30Ω For the single-phase ac circuit...
Fig. 1. Single-phase ac circuit 52 j10Ω 100sin3771+9) Load 5 +j30Ω For the single-phase ac circuit shown in Fig. 1, calculate the following: (a) (5 pts) Supply voltage phasor. (b) (5 pts) Line current phasor. (c) (5 pts) Load terminal voltage phasor. (d) (15 pts) Phasor diagram showing supply voltage, line current, and load terminal voltage. (Use the calculated phase angles.) (e) (5 pts) Instantaneous power consumed by the load. (f) (5 pts) Active power(i.e., real power) consumed by the...
A single-phase 10 kVA, 460/120 V, 60 Hz, transformer has an efficiency of 96% when it...
A single-phase 10 kVA, 460/120 V, 60 Hz, transformer has an efficiency of 96% when it delivers 9 kW at 0.9 pf lagging. The transformer is connected as an autotransformer to supply load to a 460 V circuit from a 580 V source. Show the autotransformer connection Determine kVA rating of the autotransformer Determine the efficiency of the autotransformer at full-load with 0.9 pf lagging
3. An electric motor draws 2238 W and 12 A when operating on a 240 V source. Determine the (a) Power factor of the motor. (b) Apparent power input to motor. (c) True power input to motor. (d) Horsepower output of the motor if it is 75% efficient. 4 The follwing s found on the nameplate of a motor. 3 hp 60 Hz 1 phase 120/240 V 34/17 A 1,740 RPM irthe power factor of the motor is 0.30, what...
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8 kVA resistive load (i.e., the load has a power factor of 1.0) at rated voltage of 120 V a) If you assume the transformer is ideal, what would be the magni- tude of the expected primary side (240 V side) current? b) Again, if you assume the transformer is ideal, what is the apparent impedance of the load viewed from the high-voltage side of...
Problem #4-The primaries of two ideal 240/120 v, 60 Hz single phase transformers are connected in series and the combination is fed from a 480 v supply. The secondary of one transformer is connected to a resistance of 10 ohms and the secondary of the other to a resistance of 20 ohms. a-Calculate the currents in the two resistors. b-How does the 480 v divide between the primaries of the two transformers?
Q6) A 3-phase A/Y transformer is assembled by connecting three 830-VA, 240/120-V single phase transformers. Each transformer parameters are as follow: Rp 15.5 ,Xp18.2 Q, Rcp 6.54 k2, XMp = 4.64 k Rs 2.4 , Xs2.8 a) Determine the 3-phase transformer bank's ratings (voltages and power). b) Draw the winding arrangements, equivalent Y/Y connections, and per-phase equivalent circuit
06) A 3-phase A/Y transformer is assembled by connecting three 830-VA, 240/120-V single phase transformers. Each transformer parameters are as follow: R,-15.5 Ω . X,-18.2 Ω , ROF 6.54k Rs 2.4 Ω . Xs-2.8 Ω . XMP-4.64 Ω a) Determine the 3-phase transformer bank's ratings (voltages and power). b) Draw the winding arrangements, equivalent Y/Y connections, and per-phase equivalent circuit
7. on. Suppose an engineer designs a 120/240 Volt single phase power system for a restaurant including the indoor wiring circuits. He had some conversations with the restaurant owner prior to completing his final design but the owner was not very organized so only shared the other kitchen equipment technical specs by telephone. The restaurant hired an electrician to install the kitchen equipment and inside wiring. However, when the owner met with the electrician he found the kitchen oven to...
Fig. 1. Single-phase ac circuit 52 j10Ω 100sin3771+9) Load 5 +j30Ω For the single-phase ac circuit shown in Fig. 1, calculate the following: (a) (5 pts) Supply voltage phasor. (b) (5 pts) Line current phasor. (c) (5 pts) Load terminal voltage phasor. (d) (15 pts) Phasor diagram showing supply voltage, line current, and load terminal voltage. (Use the calculated phase angles.) (e) (5 pts) Instantaneous power consumed by the load. (f) (5 pts) Active power(i.e., real power) consumed by the...
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