Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 32, Problem 3PA
You are an electrician working in an industrial plant. A 30-hp three-phase squirrel- cage motor keeps tripping out on overload. The motor is connected to a 240-volt line. Voltage measurements indicate the following voltages between the different phases: A-B = 276 volts, B-C = 221 volts, and A-C = 267 volts. Determine the percentage of heat rise in the winding with the highest current.
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Chapter 32 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 32 - What are the three basic types of three-phase...Ch. 32 - What is the principle of operation of all...Ch. 32 - What is synchronous speed?Ch. 32 - What two factors determine synchronous speed?Ch. 32 - Prob. 5RQCh. 32 - Name three factors that determine the torque...Ch. 32 - Is the synchronous motor an induction motor?Ch. 32 - Prob. 8RQCh. 32 - Why must a synchronous motor never be started when...Ch. 32 - Name three characteristics that make the...
Ch. 32 - What is the function of the field-discharge...Ch. 32 - Why can an induction motor never operate at...Ch. 32 - A squirrel-cage induction motor is operating at...Ch. 32 - Prob. 14RQCh. 32 - Prob. 15RQCh. 32 - Prob. 16RQCh. 32 - Name three factors that determine the amount of...Ch. 32 - Why will the rotor of a wound-rotor motor not turn...Ch. 32 - Why is the starting torque per A of starting...Ch. 32 - When is a synchronous motor a synchronous...Ch. 32 - What determines when a synchronous motor is at...Ch. 32 - How can a synchronous motor be made to have a...Ch. 32 - Is the excitation current of a synchronous motor...Ch. 32 - Prob. 24RQCh. 32 - Prob. 25RQCh. 32 - You are working as a plant electrician. It is your...Ch. 32 - You have been given the task of connecting a...Ch. 32 - You are an electrician working in an industrial...
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- Q2: b- Explain how does the three- phase induction motor work? *arrow_forward1.) A 5 hp 3-phase motor draws current when connected to 230 volt. Determine the efficiency of the motor draws 12.5 A and the power factor is 0.9 a. 80 % c. 83.3 % b. 92.3% d. 102.3 % 2.)A three-phase motor commonly used for high stating torque a. WRIM b. SCRIM c. SM d. SPIM 3.)The power stated in the nameplate of a motor is a. Power drawn by the motor c. Power drawn in kilowatt b. Power generated d. Output power of the shaftarrow_forwardThe factors effecting the speed of dc motor are The flux p and the voltage across the armature the voltage across the armature and the applied voltage V The applied voltage V, flux p and the voltage across the armature none of the aboye Indicate whether the following statement are true or false * True False The distance between the beginnings of each cascaded two coils is called commutator Pitcharrow_forward
- Full load current for 3-phase, 440 volts, 20 HP induction motor will be closer to (a) 5 A (c) 25 A (b) 15 A (d) 35 Aarrow_forwardWhich of the following is/are a part a generator's electric circuit?a) the commutator b) the brushes c) the armature windings d) all of the abovearrow_forwardWhy is more than one coil used on a generator armature? a) to help keep the brush voltage as low as possible b) to increase the difference between the brush low voltage and brush high voltage c) to help maintain a more constant brush voltage d) none of the above . Which of the following is/are a type of DC generator armature winding configuration? a) lap b) wave c) frogleg d) all of the abovearrow_forward
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