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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- In an On-Off AC Voltage controller, the ON time is 50 cycles and duty cycle is 0.25. The OFF time cycles will be O a. 150 O b. 75 O c. 25 O d. 50arrow_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 armature of a shunt generator has 0.05 ohm effective resistance. Each brush has an effective resistance of 0.01 ohm. The terminal voltage is 100 volts while the current is 40 amperes. What is its efficiency?arrow_forward
- The 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_forwardThe armature of a shunt generator has 0.08-ohm effective resistance. Each brush has an effective resistance of 0.02 ohm. The terminal voltage is 120 V while the current is 60 A. What is its efficiency?arrow_forwardFull 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_forward
- Which 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_forwardMake a wiring diagram for a 3-phase motor that has a forward/reverse function And explain how to read the diagram in the picturearrow_forward3. Two 750 kW alternators operate in parallel. The speed regulation of one machine is 100% to 103 % from full-load to no-load and that of the other is 100% to 104 %. How will the two alternators share a load of 1000 kW ? [464-3 kW; 535-7 kW]arrow_forward
- A 220 V d.c. series motor is taking a current of 40 A. Resistance of armature = 0.5 ohm and resistance of series field = 0.25 ohm. What is the voltage at the brushes ?arrow_forwardis the DC motor in figure 1 turning in the same direction as that in figure 3 ? a- yes b- noarrow_forwardA 400V, 60HZ, 6-pole wye connected , 30 induction motor draws 75KW with a line current of 100A. The core loss is 2KW, Friction and Windage loss is 1.2KW. The stator resistance between two terminals is 0.352. What is the efficiency if the motor runs at a slip of 2.5%?arrow_forward
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