Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 34, Problem 3PA
Refer to the first Practical Application in this set. When the 50-HP motor replaces the 30-HP motor, the overload heaters will have to be changed. Using the chart in Figure 34-8, what size overload heaters should be used to protect the 50-HP motor?
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A direct current motor is connected to a 250-volt DC supply. The armature has a current draw of 165 amperes when operating at full load. You have been assigned the task of connecting two resistors in the armature circuit to provide speed control for the motor. When both resistors are connected in the circuit, the armature current is to be limited to 50% of the full-load current draw. When only one resistor is connected in the circuit, the armature current is to be limited to 85% of full-load current. Determine the ohmic value and min-imum power rating of each resistor.
Chapter 34 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 34 - Which NEC table is used to determine the full...Ch. 34 - A 5-HP single-phase motor is connected to 208...Ch. 34 - A 10-HP single-phase motor is connected to 240...Ch. 34 - A 75-HP synchronous motor is connected to a...Ch. 34 - A squirrel-cage induction motor has a nameplate...Ch. 34 - A squirrel-cage motor has a nameplate current...Ch. 34 - A 100-HP three-phase squirrel-cage induction motor...Ch. 34 - A 60-HP synchronous motor is connected to 240...Ch. 34 - Prob. 9RQCh. 34 - Both the motors and the feeder in Question 9 are...
Ch. 34 - A 30-HP squirrel-cage induction motor is connected...Ch. 34 - Refer to the preceding Practical Application. When...Ch. 34 - Refer to the first Practical Application in this...Ch. 34 - A 10-HP single-phase motor is connected to 240...Ch. 34 - A 500-HP synchronous motor is connected to 2300...Ch. 34 - A 30-HP three-phase squirrel-cage induction motor...Ch. 34 - A 75-HP synchronous motor is connected to a...Ch. 34 - Prob. 5PPCh. 34 - A 350-HP squirrel-cage induction motor is...Ch. 34 - Three squirrel-cage motors are connected to a...
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