Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 17, Problem 17RQ
To determine
The reason for higher starting torque per ampere of starting current for wound rotor motor than that of a squirrel cage motor.
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Name three factors that determine the torque produced by an induction motor.
Name three factors that determine the amount of voltage induced in the rotor of a wound-rotor motor.
7. Who among the following got a patent for an induction motor in 1888?
A. Newton
B. Torilcelli
C. Nichola Tesla
D. Thomas Edison
Chapter 17 Solutions
Electrical Transformers and Rotating Machines
Ch. 17 - Prob. 1RQCh. 17 - Prob. 2RQCh. 17 - What is synchronous speed?Ch. 17 - What two factors determine synchronous speed?Ch. 17 - Name three factors that cause the magnetic field...Ch. 17 - Name three factors that determine the torque...Ch. 17 - Is the synchronous motor an induction motor?Ch. 17 - What is the amortisseur winding?Ch. 17 - Prob. 9RQCh. 17 - Prob. 10RQ
Ch. 17 - Prob. 11RQCh. 17 - Why can an induction motor never operate at...Ch. 17 - Prob. 13RQCh. 17 - Prob. 14RQCh. 17 - Prob. 15RQCh. 17 - Prob. 16RQCh. 17 - Prob. 17RQCh. 17 - Prob. 18RQCh. 17 - Prob. 19RQCh. 17 - Prob. 20RQCh. 17 - How is the speed of a consequent pole...Ch. 17 - A three-phase squirrel-cage motor is connected to...
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- A motor develops 189 ft-lb of torque at 1745 RPM. What is the horse-power output of the motor?arrow_forwardName three factors that determine the amount of torque developed by a wound rotor induction motor.arrow_forwardProblem 5 1. Where and why is a centrifugal switch used in a split-phase motor? 2. Why and where is a capacitor used in the single-phase AC motor? 3. What type of motor would you select to perform each of the following jobs? (a) Electric drill: (b) Refrigerator: (c) Hair driers and desk fans: (d) Air Conditioner Fan: (e) XY plotters and printers: (f) Electric clock:arrow_forward
- A motor develops 225 ft-lb of torque at 860 RPM. What is the horsepower output of the motor?arrow_forwardWhen a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forwardThe reason why the starting torque of a series motor is higher than a shunt motor is because the series motor has O more current flowing through its armature O a stronger net magnetic field around both coils during the inrush of stator currentarrow_forward
- A (21 HP, 3-Phase, 380 volts) motor with an efficiency of 95% is operating at a load factor of 0.63. What is the input current (Amperes) when the power factor is 89%? (1 HP = 0.75 kW)arrow_forwardplease answer quickly!!arrow_forwardDoes the motor constant depend on the angular speed? Vemf Does motor efficiency n = depend on the angular speed o of the motor? Va c. Loaded Motor Does the motor constant depend on the load? When the magnetic load on the motor increases, does the current increase, remain constant or increase?arrow_forward
- For a hydrulic motor , define volumetric, mechanical, and overall effiency.arrow_forwardDescribe a washer machine motor you have experience with. What is it being used for, what power source it uses, and possibly it’s configuration. Explain why you picked this motor and if you have/need to perform(ed) any maintenance on it.arrow_forwardA motor is operating a load that requires a torque of 750 lb–in and is turning at a speed of 1,575 RPM. How much horsepower is the motor producing?arrow_forward
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