MAB orque in pound-feet. The inrush current to a synchronous motor is 235 amp when it is started from a rated-voltage source of 2,200. What per cent tap on a compensator should be used if the starting current on the line side is to h limited to 100 amp? What vo.tage will be impressed upon the motor at the starting instant? WZL

MAB orque in pound-feet. The inrush current to a synchronous motor is 235 amp when it is started from a rated-voltage source of 2,200. What per cent tap on a compensator should be used if the starting current on the line side is to h limited to 100 amp? What vo.tage will be impressed upon the motor at the starting instant? WZL

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter8: Basic Electric Motors

Section: Chapter Questions

Problem 27RQ

See similar textbooks

Similar questions

10 No-load speed of which of the following DC motor will be highest? * all of the above shunt motor none separately excited motor series motor
5. A 220 V dc shunt motor takes 4 A at no-load and runs at 700 rpm. Ra = 0.60 ohm and Rf = 110 ohms. What is the speed of the motor when the motor input is 8800 W?
Q2] Fill in the blank (9 Marks) 1-The current drwan by the armature of D.C. motor is directly proportional to 2- The speed of a D.C. shunt-wound motor will shunt field regulator is increased. 3- The synchronous speed of a three-phase induction motor is number of pairs of poles. Rotor copper losses Rotor input power in induction motor = 5- A 4-pole three-phase induction motor has a synchronous speed of 25 r.p.s. The frequency of the supply to the stator is_ Hz. 6- The power input to a mains transformer is 200VA. If the primary current is 2.5A, the secondary voltage is 2V and assuming no losses in the transformer, the turns ratio step down. is 7- A 200kVA transformer has an iron loss of 1 kW and full load cu loss of 2 kW. Its load kVA corresponding to maximum efficiency is kVA. 8- If cu loss of a transformer at 7/8th full load is 4900 W, then its full-load cu loss would be watt. 4- if the value of resistance of the proportional to the 9- The slight curvature at the lower end of the open…
A three-phase, 60 Hz, squirrel-cage induction motor draws a current of 385 amps per phase and a total active power of 2344 kW when operating at full load from a 4000 volt (line) supply. The corresponding speed is 709.2 rev/min. The stator is star-connected and the resistance between two stator live terminals is 0.1 ohms. The machine has 10 poles, the total iron losses are 23.4 kW and the windage and friction losses are 12 kW. Calculate: (i) the power factor at full load? (ii) the active power supplied to the rotor? (iii) the total I'R losses in the rotor?
A 480-V, 25-hp, 50-Hz, Six-pole, Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit: R₁ = 0.75 92, R₂ = 0.45 2, X₁=0.9 92, X₂ = 0.5 , XM = 20 92. The total rotational losses are 950 W and are assumed to be constant. The core loss is 100 W. For a rotor slip of 4 percent at the rated voltage and rated frequency, find the motor's (a) Rotor mechanical Speed in (rad/sec). (d) Pcony and Pout. (e) Tind and Tload. (b) Stator current. (c) Power factor. (f) Efficiency.
A 150 HP, 3-phase, 6 pole, 460 V, 60 Hz induction motor draws 195 A line current at full load speed of 1170 rpm and 0.85 pf. Solve for the percent slip at full load. (a). 2.5% (b). 3.0% (c). 2.8% (d). 2.0%
The efficiency of 100 kW, 600V, 3 phase synchronous motor is 90%. When the pf is 0.9 leading, what is the armature current?
Type your question here 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 extemal resistance per phase, which must be added to lower the speed to 1200 rpm, torque remaining the same?
A 220 V shunt motor driving its normal load draws an armature current of 50 A from a 220 V dc source. The armature resistance of this motor including brushes is 0.25 ohms. How much armature current (minimum) Will this motor draw from a 200 V DC source when driving the same load with the field adjusted to maintain the same speed.
l7 answer 7 and 8
1-why the slipoccur in the induction motor? 2- why the slip is less than 1? 3-what the adrantage of study the slip in the induction motor?
(b) What is the line current of the motor at rated conditions? (c) What is the internal generated voltage EA of this motor at rated conditions? 3- A DC series motor draws 75 A at 230 V and rotates at 1200 rpm. The armature and series field resistances are 0,11 ohm and 0,14 ohm respectively. Calculate the speed of the motor when it draws 25 A from the source. norame