Homework Answers
Add Answer to:
Question 2: A large network supplies a three phase induction motor through a shor eeder line....
Question 2: A large network supplies a three phase induction motor through a short feeder line. The following data are provided No-load Test Data: ho-load 480 V; Ino-load = SA; Pno-load 1.3 kw Blocke...
Question 2: A large network supplies a three phase induction motor through a short feeder line. The following data are provided No-load Test Data: ho-load 480 V; Ino-load = SA; Pno-load 1.3 kw Blocked-rotor Test Data: Volocked-rotor 52 V; Iblocked-rotor 34 A; Polocked-rotor 1.3 kw: frequencyblocked-Fotor 25 Hz Stator Resistance: Rstator 0.3529 n/mile; Length 3 miles (0.1+j0.56) Supply Feeder Data: Zfeeder HP: v,upply-440 V: Number of poles-4: Slip-2.5%; Ploss- 250 w a. Calculate the magnetizing impedance of the three phase...
Q6 A 50 hp 440 V three phase induction motor is used to determine the power...
Q6 A 50 hp 440 V three phase induction motor is used to determine the power rating of a load. With the load connected to the motor shaft, the input power is 30.5 KW and the stator current is 34.5 A at rated voltage. The blocked rotor test on the motor yields a current of 44.3 A at 52.5 V and a power input of 2.1 kW. When running with no load at rated voltage, the motor takes 16.3 A...
Two tests were performed on a 230-V, 60-Hz, 4-pole, Y-connected, three-phase induction motor and the obtained...
Two tests were performed on a 230-V, 60-Hz, 4-pole, Y-connected, three-phase induction motor and the obtained data are given in the table below. The friction and windage loss is 15 W, and the stator winding resistance between any two lines is 3.96ohm Determine: 1) The equivalent circuit parameters of the motor 3) The motor efficiency at a slip of 8%. No-load test 137 0.43 230 Blocked-rotor test 70 1.18 47 3-phase power input, W Line-line voltage, V
The following test data apply to a 7.5-hp, three-phase, 220-V, 19-A, 60-Hz, four-pole induction motor with...
The following test data apply to a 7.5-hp, three-phase, 220-V, 19-A, 60-Hz, four-pole induction motor with a double-squirrel-cage rotor of design class C (high-starting-torque, low-starting current type): Test :No-load test at 60 Hz; Applied voltage V - 219 V line-to-line; Average phase current I, nl 5.70 A; Power Pnl -380 W; Test 2: Blocked-rotor test at 15 Hz; Applied voltage V 26.5 V line-to-line; Average phase current lbl 18.57 A; Power Pbl 675 W; Test 3: Average de resistance per...
5 Marks) A 4-pole, 3 phase, 50 Hz, 230 V induction motor. Each phase of rotor winding b) has one-fourth the number of t...
5 Marks) A 4-pole, 3 phase, 50 Hz, 230 V induction motor. Each phase of rotor winding b) has one-fourth the number of turns of each stator. The full-load speed is 1,455 rpm. The rotor resistance is 0.3 Ω and rotor standstill reactance is 1.0 Ω per phase. The rotor and stator windings are similar. Stator losses are equal to 50 Watts. Friction and windage losses are equal to 30 W. Calculate ) Blocked rotor voltage per phase. 2 Marks)...
4. A certain four-pole 240-V-rms 50-Hz delta-connected three-phase induction motor operates at slip 5% at full...
4. A certain four-pole 240-V-rms 50-Hz delta-connected three-phase induction motor operates at slip 5% at full load and has rotational losses (windage + friction) of 100 W. The stator resistance per phase is 0.2 Ohm. The results of no-load and locked-rotor tests on this motor are as follows: No-load test Locked-rotor test Line-to-line input voltage: 240 V 45 V Input active power: 1100 W 1300 W Input line current: 10 A 30 A Using the tests data, determine parameters of...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor speed is the same as the rotating magnetic field speed. 15 MARKS b) The following data in Table 2 was obtained from the no-load test, locked rotor test and DC test of a three-phase delta-connected, 450 V, 2-pole, 60 Hz, wound-rotor induction motor. The locked rotor test was done at 15Hz. No-load test Vyt = 450 V Ini - 30 A PNL-4.6 kW Table...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor speed is the same as the rotating magnetic field speed. [5 MARKS] The following data in Table 2 was obtained from the no-load test, locked rotor test and DC test of a three-phase delta-connected, 450 V, 2-pole, 60 Hz, wound-rotor induction motor. The locked rotor test was done at 15Hz. b) Table 2 No-load test Locked rotor test DC test VNL = 450 V...
Q10. A three phase, 100-hp, 2400V, 6-pole, 50 Hz induction motor is tested, with the following...
Q10. A three phase, 100-hp, 2400V, 6-pole, 50 Hz induction motor is tested, with the following test results obtained: No-load test (at 50 Hz) Block-rotor test (at 12.5 Hz) 420 35 11500 Signal Voltage (V) 2400 Current (A) 10 Power (W) 4200 Stator resistance is measured at 1.75 Ω per phase. a) Find the parameters of the equivalent circuit b) At a slip of 0.25, calculate the power and torque output and the efficiency of this motor. Ans. : a)...
Question 2 [10 marks) A six pole, three phase induction motor, with a star connected stator...
Question 2 [10 marks) A six pole, three phase induction motor, with a star connected stator winding is energised from a 380V, 50Hz supply. The ratio of the stator to rotor turns is assumed 1.8 and a full load slip of 4%. If the respective per phase rotor resistance and standstill reactance are 0.120 and 0.8502, determine: a. Torque developed at full load b. The maximum torque and the speed at maximum torque
Question 2: A large network supplies a three phase induction motor through a short feeder line. The following data are provided No-load Test Data: ho-load 480 V; Ino-load = SA; Pno-load 1.3 kw Blocked-rotor Test Data: Volocked-rotor 52 V; Iblocked-rotor 34 A; Polocked-rotor 1.3 kw: frequencyblocked-Fotor 25 Hz Stator Resistance: Rstator 0.3529 n/mile; Length 3 miles (0.1+j0.56) Supply Feeder Data: Zfeeder HP: v,upply-440 V: Number of poles-4: Slip-2.5%; Ploss- 250 w a. Calculate the magnetizing impedance of the three phase...
Q6 A 50 hp 440 V three phase induction motor is used to determine the power rating of a load. With the load connected to the motor shaft, the input power is 30.5 KW and the stator current is 34.5 A at rated voltage. The blocked rotor test on the motor yields a current of 44.3 A at 52.5 V and a power input of 2.1 kW. When running with no load at rated voltage, the motor takes 16.3 A...
Two tests were performed on a 230-V, 60-Hz, 4-pole, Y-connected, three-phase induction motor and the obtained data are given in the table below. The friction and windage loss is 15 W, and the stator winding resistance between any two lines is 3.96ohm Determine: 1) The equivalent circuit parameters of the motor 3) The motor efficiency at a slip of 8%. No-load test 137 0.43 230 Blocked-rotor test 70 1.18 47 3-phase power input, W Line-line voltage, V
The following test data apply to a 7.5-hp, three-phase, 220-V, 19-A, 60-Hz, four-pole induction motor with a double-squirrel-cage rotor of design class C (high-starting-torque, low-starting current type): Test :No-load test at 60 Hz; Applied voltage V - 219 V line-to-line; Average phase current I, nl 5.70 A; Power Pnl -380 W; Test 2: Blocked-rotor test at 15 Hz; Applied voltage V 26.5 V line-to-line; Average phase current lbl 18.57 A; Power Pbl 675 W; Test 3: Average de resistance per...
5 Marks) A 4-pole, 3 phase, 50 Hz, 230 V induction motor. Each phase of rotor winding b) has one-fourth the number of turns of each stator. The full-load speed is 1,455 rpm. The rotor resistance is 0.3 Ω and rotor standstill reactance is 1.0 Ω per phase. The rotor and stator windings are similar. Stator losses are equal to 50 Watts. Friction and windage losses are equal to 30 W. Calculate ) Blocked rotor voltage per phase. 2 Marks)...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor speed is the same as the rotating magnetic field speed. 15 MARKS b) The following data in Table 2 was obtained from the no-load test, locked rotor test and DC test of a three-phase delta-connected, 450 V, 2-pole, 60 Hz, wound-rotor induction motor. The locked rotor test was done at 15Hz. No-load test Vyt = 450 V Ini - 30 A PNL-4.6 kW Table...
QUESTION 2 [25 MARKS] a) Describe what will happen to the induction motor when the rotor speed is the same as the rotating magnetic field speed. [5 MARKS] The following data in Table 2 was obtained from the no-load test, locked rotor test and DC test of a three-phase delta-connected, 450 V, 2-pole, 60 Hz, wound-rotor induction motor. The locked rotor test was done at 15Hz. b) Table 2 No-load test Locked rotor test DC test VNL = 450 V...
Q10. A three phase, 100-hp, 2400V, 6-pole, 50 Hz induction motor is tested, with the following test results obtained: No-load test (at 50 Hz) Block-rotor test (at 12.5 Hz) 420 35 11500 Signal Voltage (V) 2400 Current (A) 10 Power (W) 4200 Stator resistance is measured at 1.75 Ω per phase. a) Find the parameters of the equivalent circuit b) At a slip of 0.25, calculate the power and torque output and the efficiency of this motor. Ans. : a)...
Question 2 [10 marks) A six pole, three phase induction motor, with a star connected stator winding is energised from a 380V, 50Hz supply. The ratio of the stator to rotor turns is assumed 1.8 and a full load slip of 4%. If the respective per phase rotor resistance and standstill reactance are 0.120 and 0.8502, determine: a. Torque developed at full load b. The maximum torque and the speed at maximum torque
Most questions answered within 3 hours.
-
What mechanisms Drive speciation??
(I.e. what was Dawins theory on the orgin of species, and how...
asked 1 hour ago -
The manager at a car assembly plant believes that the mean
assembly time for a car...
asked 2 hours ago -
Which of the following is true of electron capture?
A) It decreases the nuclide's mass number...
asked 3 hours ago -
Assuming an efficiency of 43.10%, calculate the actual yield of
magnesium nitrate formed from 114.9 g...
asked 4 hours ago -
The highly pathogenic bacterium Clostridium
perfringens causes gangrene, a disease that results in the
destruction of...
asked 6 hours ago -
In the context of situation analysis, which of the following is
a category for analysis in...
asked 6 hours ago -
In a study of the gas phase decomposition of sulfuryl chloride
at 600 K SO2Cl2(g)SO2(g) +...
asked 6 hours ago -
75 g of 2-propanol (C3H8O) and 25 g of pentane are mixed in a
200 mL...
asked 6 hours ago -
The 2800-turn coil in a dc motor has an area per turn of 1.1 ×
10-2...
asked 6 hours ago -
Draw a combinational logic circuit diagram with a symbol inside
the box for two I/P of...
asked 6 hours ago -
The cliché we use quite a lot in finance is: there is a need to
maximize...
asked 6 hours ago -
In class we discussed the addition of HCl to alpha pinene. Would
you expect one or...
asked 6 hours ago