Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 6, Problem 4PA
To determine
The ohmic value and minimum power rating of each resistor.
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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.
A direct current motor is connected to a 250-volt dc supply. The armature has a current draw of 165 amps when operating on a 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 is to be limited to 50% of the full-load current draw. When only one resistor is connected in the circuit, the armaturecurrent is to be limited to 85% of full-load current. Determine the ohmic value and minimum power rating of each resistor.
A belt-driven 202 Hp shunt wound DC generator is running at 465 rpm and issupplying full load to a bus bar at 232 V. At what speed will it run if the belt breaksand the machine continue to run taking 9 kW from the bus bar? The armature andthe field resistances are 0.05 Ohm and 100 Ohms respectively. The brush contactdrop is 2 Volts per brush.
Chapter 6 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 6 - A series circuit has individual resistor values of...Ch. 6 - A series circuit contains four resistors. The...Ch. 6 - A series circuit contains five resistors. The...Ch. 6 - A circuit has three resistors connected in series....Ch. 6 - A circuit has four resistors connected in series....Ch. 6 - Define a series circuit.Ch. 6 - State the three rules for series circuits.Ch. 6 - A series circuit has resistance values of...Ch. 6 - If a voltage of 24 V is applied to the circuit in...Ch. 6 - Referring to the circuit described in Questions 8...
Ch. 6 - A series circuit contains the following values of...Ch. 6 - Determine the resistance values using the color...Ch. 6 - Determine the resistance values using the color...Ch. 6 - Prob. 1PACh. 6 - Three wire-wound resistors have the following...Ch. 6 - You are an electrician working in an industrial...Ch. 6 - Prob. 4PACh. 6 - Using the three rules for series circuits and Ohms...Ch. 6 - Use the general voltage divider formula to...Ch. 6 - Find all missing values for the circuit shown in...Ch. 6 - Find all missing values for the circuit shown in...
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- A three-terminal manual starting rheostat has a resistance of 5.2 ohms in its starting resistor. The holding coil resistance is 10 ohms. This starting rheostat is connected to a shunt motor. The resistance of the armature is 0.22 ohm; the resistance of the shunt field is 100 ohms. The line voltage is 220VDC. a. What is the starting surge current taken by the motor? b. What is the current in the holding coil with the moveablew arm in the run position? c. What is the CEMF with the movable arm in the on position if the armature current is 20 amps?arrow_forwardA shunt generator delivers 195 Amp of terminal of voltage 250Volts. The armature resistance and shuntfield resistance are 0.02 ohm and 50 ohms respectively. The iron and friction losses equal to 950 Watts.The overall efficiency is?arrow_forwardANSWERE FAST PLEASE QUESTION from book ELECTRIC MACHINE-1 LAB BASESD QUESTION Answer precisely keeping in view the experiments performed with the equipment in the lab.i. You are working with the DC motor and the motor is accelerating. Suggest a way that canoptimally control the speed of the motor. Explain the method and how it is a better way.ii. What type of DC motor should be used when the load connected requires a higher starting torque?Precisely explain and draw the relevant circuit.iii. What will happen to a DC series motor if the load is suddenly thrown off the motor? You canexplain with any mathematical reasoning.iv. What effect will the load have on a DC shunt motor with significantly high armature resistance?v. For the four-point DC starter kit, what will happen if the series resistances are connected in reverseorder. Draw and explain how this combination is better than the 3 points started.arrow_forward
- Why do you think some motor control circuit utilizes single voltage sources for control and power circuit? Explain.arrow_forwardPlease answer this question. I have also added "Lab 5 To-do Test 1" below. //LAB5 To-do TEST1: Change this code to implement the behavior described in the prelab section "Programming the Stepper Motor" //Enable this code to test the stepper motor separately Serial.println("Turning clockwise"); //output message to serial monitor steppermotor.setSpeed(60); //set speed to make 20 rotations per minute (each rotation takes 2 seconds) steppermotor.step(300); //rotate clockwise by 300 steps (5 revolutions since STEPS is 60 //END TEST1arrow_forwardThe armature resistance of 220 V D.C. shunt motor is 0.4 Ω. The full load current is 26 Amp. The ratio of maximum current at starting to full load current is 1.538. Calculate the number of resistance sections and value of each resistance sections to be used in this starter.arrow_forward
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