QUESTION 10A squirrel cage induction motor's nameplate values are 2.5 kW, 380 V, 3 phase, 50 Hz, Isn=5 A, 1460 rpm, 4 poles.When the motor is working at no-load operation, it draws 40% of the rated (full load current) from the grid. While andPfv-0,05 Pin Eind the reactive powers while the motor draws during no-load operation.OA 1000B. 1442.1OC 1311D. 1376O E. 1460QUESTION 11A star-connected three-phase cylindrical rotor synchronous generator of 1000 kVA with a phase-to-phase voltage of4600 V, resistance per phase Rg = 2 N/phase, the synchronous reactance per phase Xg = 20 phase. At rated loadcurrent;a. Unity power factor (ohmic),Find the values of induced voltages.OA 3153,45 VB. 5462 VC. 3840.67 VO D. 4961,29 W

As per our policy I have to do the first one only. Given data, Power, PNL = 0.05×2.5×103=125 W.…

QUESTION 10 A squirrel cage induction motor's nameplate values are 2.5 kW, 380 V, 3 phase, 50 Hz, Isn=5 A, 1460 rpm, 4 poles. When the motor is working at no-load operation, it draws 40% of the rated (full load current) from the grid. While and Pfv-0,05 Pin Eind the reactive powers while the motor draws during no-load operation. A. 1000 B. 1442.1 OC 1311 O D. 1376 O E. 1460 QUESTION 11 A star-connected three-phase cylindrical rotor synchronous generator of 1000 kVA with a phase-to-phase voltage of 4600 V, resistance per phase Rg 2 /phase, the synchronous reactance per phase Xg 20 /phase. At rated load current; a. Unity power factor (ohmic), Find the values of induced voltages. OA 3153,45 V O B. 5462 V O C. 3840.67 V D. 4961,29 W

QUESTION 10 A squirrel cage induction motor's nameplate values are 2.5 kW, 380 V, 3 phase, 50 Hz, Isn=5 A, 1460 rpm, 4 poles. When the motor is working at no-load operation, it draws 40% of the rated (full load current) from the grid. While and Pfv-0,05 Pin Eind the reactive powers while the motor draws during no-load operation. A. 1000 B. 1442.1 OC 1311 O D. 1376 O E. 1460 QUESTION 11 A star-connected three-phase cylindrical rotor synchronous generator of 1000 kVA with a phase-to-phase voltage of 4600 V, resistance per phase Rg 2 /phase, the synchronous reactance per phase Xg 20 /phase. At rated load current; a. Unity power factor (ohmic), Find the values of induced voltages. OA 3153,45 V O B. 5462 V O C. 3840.67 V D. 4961,29 W

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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For a squirrel-cage rotor induction motor with V1Ln= 692 [V], 11[kW], 50[Hz], power factor= 0.872, 3-phase, 2-pole, star-connected on the nameplate: in the idle run test: power draw is 200 [W], idle (current) angle theta0=80 [degrees back], phase-to-phase voltage V1Ln [v] In the short circuit (locked rotor) test: absorbed power 850[W], short circuit (current) angle theta sc=70 [degrees back], phase-to-phase value of short-circuit voltage 0.1*V1Ln[V] measured. Find the following approximate equivalent circuit parameters reduced to the stator. A) Rc [ohm] B) Xm [ohm] C) Req [ohm] D) Xeq [ohm]
16. A single-phase, 1/4 hp, 230 V, 60 Hz, four-pole, 1710 rpm induction motor has the following equivalent circuit parameters for the main winding: R1m=9.5Ω, R02=10.8Ω, X1m=X/2=12Ω, Xmag=260Ω At 230V and rated speed, the core loss is 30W, and the friction and windage loss is 15W. The motor is connected to an 1 φ, 230V, 60Hz supply and runs at the rated speed. Determine:a) The slip.b) The motor current.c) The input power factor.d) The input power.e) The developed torque.f) The output shaft power and shaft torque.g) The efficiency.h) The rotor circuit frequencies and the rotor cu-losses.i) The ratio of the forward flux to the backward flux.
The equivalent circuit parameters of a 230-V, 1-phase, 6-pole, 60-Hz induction motor are: R1 = R2’ =10ohm, X1 = X2’ = 10ohm, and Xm = 100ohm. At a slip of 5%, calculate the developed torque and The input power to the motor at 230V, while running on no-load, is 31.4 W at 1.2 A. What is the approximate efficiency of the motor at 5% slip?
Q3 // Answer for the following question: 1-The rotor of a 4 pole, 50 Hz, slip ring induction motor has a resistance of 0.25 ohm per phase and runs at 1440 rpm at full-load.Calculate the external resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same? 2- Calculate the torque developed per phase for a 6-pole, 60 Hz, 3-phase induction motor at a slip of 5%, if the motor develops a maximum torque per phase is 250 N.m while running at 870 r.p.m. ( This question is about electrical machines, and I need to answer in 30 minutes please )
A three phase, 4 pole, 3300 V, 50 Hz, star connected Induction motor, has identical primary and referred secondary impedance of value 3+j9 Ohm per phase. Using the approximate circuit, calculate: A. The full load torque at rated slip of 5%. B. The maximum torque at normal voltage and frequency.
The primary leakage impedance and equivalent secondary impedance referred to stator atstandstill of a 3-phase, 220 V, 50-Hz, 4-pole induction motor are (0.4 + 3j)ohms and (1.2 + j1) ohms per phaserespectively. If the magnetizing current is neglected, determine the maximum torque the motor candevelop and slip at which it occurs.
A 220 V, single-phase induction motor gave the following test results:Blocked-rotor test: 120 V, 9.6 A, 460 WNo-load test: 220 V, 4.6 A, 125 WThe stator winding resistance is 1.5 Ω, and during the blocked-rotor test, the starting winding is open. Determine the equivalent circuit parameters. Also, find the core, friction and windage losses.
4. A 3-phase, delta connected, 440 volt (line to line), 50 Hz, 6 pole induction motor has the following constants, in ohms per phase referred to the stator:R1 = 0.4, R2* = 0.2, I2’=54A and stator current is 60A, Friction, windage and stray load losses = 300 Watts. For a slip of 3.00%, Calculate the airgap power, mechanical power developed and output power when the motor is operated at rated voltage and frequency.
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Find the main dimensions, number of stator turns and number of stator slots of a 30 H.P., 440 volt, 3 phase, 50 Hz, 960 rpm squirrel cage induction motor using following data: Specific magnetic loading = 0.45 wb/m² Specific electrical loading = 25000 amp. conductor/cm, full load efficiency= 0.86, full load power factor = 0.87. Assume that stator winding is delta connected for normal running.
- Reconnecting Induction Motors 6.a. The voltage in a 460-volt motor is changed to 425 volts. If the original torque was 125 lb-ft, the newtorque isA. 135 lb-ft.B. 117 lb-ft.C. 115 lb-ft.D. 107 lb-ft.6.b. If a 575-volt three-phase motor originally connected in 3-parallel △ is reconnected in 5-parallel Y, thenew voltage isA. 501 volts.B. 794 volts.C. 598 volts.D. 747 volts.
A 3-phase, 60 Hz, six pole, 220-volt wound rotor induction motor has a stator that is connected in Delta and the rotor that is connected in Wye. The rotor has haft as many turns as that stator. the RR is equal to 0.1- ohm and XBR is equal to 0.5-ohm (a) calculate also the starting torque developed by the motor (b) For over all operation of this induction motor, calculate the efficiency based on the gathered data.