Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Chapter 4, Problem 57P
The motor used on a conveyor belt is 85% efficient. If the overall efficiency is 75%, what is the efficiency of the conveyor belt assembly?
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A 255 V, DC lathe machine, (not a 2 pole machine) has armature resistance and series resistance are
0.150 and 1702 respectively. The motor has 25mWb flux per pole. The ratio of pole to parallel paths
is unity. The product of this ratio and number of turns in armature section is 1000. When it runs light, it
has a speed of 1200 rpm. If it runs at maximum load, it takes a current of 70A.
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Which machine is this one, shunt or series ?
Is machine lap wound or wave wound?
(3)
Calculate the no load back EMF.
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Calculate the no load armature current.
(5)
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(6)
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Calculate the armature power when it runs light.
(9)
Calculate the stray losses when it runs light.
(10)
Calculate the full load armature current.
(11)
(12)
(13)
Calculate the full load back EMF.
Calculate the Variable losses on maximum possible load.
Calculate the armature power on maximum load.
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What is the coupling field used between the
electrical and mechanical systems in energy
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if a dc generator delivers 180w to a load, what is the minimum hp needed to drive the generator(assume 100% efficiency)
Chapter 4 Solutions
Introductory Circuit Analysis (13th Edition)
Ch. 4 - What is the voltage across a 220 resistor if the...Ch. 4 - What is the current through a 2.20 resistor if the...Ch. 4 - How much resistance is required to limit the...Ch. 4 - At starting, what is the current drain on a 12 V...Ch. 4 - If the current through a 100k resistor is 3.6A...Ch. 4 - If a voltmeter has an internal resistance of 50k...Ch. 4 - If a refrigerator draws 2.2 A at 120 V, what is...Ch. 4 - If a clock has an internal resistance of 8k find...Ch. 4 - A washing machine is rated at 4.2 A at 120 V. What...Ch. 4 - A CD player draws 80 mA when 4.5 V is applied....
Ch. 4 - The input current to a transistor is 20A If the...Ch. 4 - Prob. 12PCh. 4 - If an electric heater draws 9.5 A when connected...Ch. 4 - In a TV camera, a current of 5.6 mA passes through...Ch. 4 - Plot the curve of I (vertical axis) versus...Ch. 4 - Plot the I-V curve for a 5 and a 20 resistor on...Ch. 4 - Prob. 17PCh. 4 - Sketch the internal resistance characteristics of...Ch. 4 - Plot the I-V characteristics of a 1k,10k, and a 1M...Ch. 4 - If 540 J of energy are absorbed by a resistor in...Ch. 4 - The power to a device is 40 joules per second...Ch. 4 - How many joules of energy does a 8 W nightlight...Ch. 4 - How long must a steady current of 1.4 A exist in a...Ch. 4 - What is the power delivered by a 12 V battery if...Ch. 4 - The current through a 4k resistor is 7.2 mA. What...Ch. 4 - The power consumed by a 2.2k resistor is 240 mW....Ch. 4 - What is the maximum permissible current in a 82,...Ch. 4 - The voltage drop across a transistor network is 22...Ch. 4 - If the power applied to a system is 10 kW, what is...Ch. 4 - A 1 W resistor has a resistance of 4.7M . What is...Ch. 4 - A 2.2k resistor in a stereo system dissipates 42...Ch. 4 - What are the hot resistance level and current...Ch. 4 - What are the internal resistance and voltage...Ch. 4 - A calculator with an internal 3 V battery draws...Ch. 4 - A 20k resistor has a rating of 100 W. What are the...Ch. 4 - What is the total horsepower rating of a series of...Ch. 4 - A 10 resistor is connected across a 12 V battery....Ch. 4 - How much energy in kilowatthours is required to...Ch. 4 - How long can a 1500 W heater be on before using...Ch. 4 - A 60 W bulb is on for 10 h. a. What is the energy...Ch. 4 - In 10 h an electrical system converts 1200 kWh of...Ch. 4 - At 12/kWh how long can you play a 250 W color...Ch. 4 - The electric bill for a family for a month is...Ch. 4 - How long can you use an Xbox 360 for $1 if it uses...Ch. 4 - The average plasma screen TV draws 339 W of power,...Ch. 4 - The average PC draws 78 W. What is the cost of...Ch. 4 - If a house is supplied with 120 V, 100 A service,...Ch. 4 - What is the total cost of using the following at...Ch. 4 - What is the total cost of using the following at...Ch. 4 - Prob. 50PCh. 4 - The motor of a power saw is rated 72% efficient....Ch. 4 - What is the efficiency of a dryer motor that...Ch. 4 - A stereo system draws 1.8 A at 120 V. The audio...Ch. 4 - Prob. 54PCh. 4 - Prob. 55PCh. 4 - An electric motor used in an elevator system has...Ch. 4 - The motor used on a conveyor belt is 85%...Ch. 4 - Prob. 58PCh. 4 - The overall efficiency of two systems in cascade...Ch. 4 - What is the total efficiency of three systems in...Ch. 4 - If the total input and output power of two systems...Ch. 4 - Using PSpice 0r Multisim, repeat the analysis of...Ch. 4 - Using PSpice or Multisim, repeat the analysis of...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Need asap "If a material has a resistance of 40 ohms at 0°C and a resistance of 50 ohms at 50°C, what is its temperature coefficient of resistance at 50°C in per °C?" "A set equipment needs to be moved through a distance and 30 joules is the required work. If a 50W motor is used to pull the equipment, how much time is needed in secondsto accomplish the work?arrow_forward5. A load cell for the measurement of forces might have a range of 0 to 60 kN. Calculate the Span.arrow_forwardThe voltage induced in a generator is 110 V when the armature rotates at 1100 r/min. What will the voltage be if the speed is increased to 1200 r/min? A generator operating at 1850 r/min develops a voltage of 130 V. What must be the speed of the generator for a voltage of 120 V?arrow_forward
- How does electrical generation play a role in the power system, and what are the various methods of generation?arrow_forwardQ3 A – The benefit for the following: Stroboscope, Tachometer, Prime mover, Torqometer. B – Discuss the difference between critical speed and critical resistance of D.C generatorarrow_forward1. Distinguish between PV Module and PV Cell. PV Cell PV Module 2. What is the operating life time of a PV Module? 30-35 years 3. Why PV module always generates DC power? 4. Which device is used to convert the DC power in to AC Power?arrow_forward
- =62.4 lbs/nt or 9810 N/m h vertical clistance 9. A 40-hp motor drives a hoist with which is capable of lifting a 50kN load to a height of 6 m in 12 seconds. What is the efficiency of this machine?arrow_forward1. What is the importance of Electrical energy? 2. What is a Electrical efficiency and explain heat and electrical units?arrow_forwardThe armature of a de generator has 0.050 effective resistance. Each brush has an effective resistance of 0.01Q. The terminal voltage is 100 volts, while the current is 40 Amperes. What is the efficiency of the machine?arrow_forward
- SHOW YOUR COMPLETE SOLUTION, ANSWER MUST BE IN 2 DECIMAL PLACES. SHOW WHAT IS GIVEN AND WHAT IS THE UNKNOWN. A shunt generator delivers 450A at 230V and the armature resistance is 0.03 ohms. Calculate the shunt field resistance if the generated emf is measured at 243.6Varrow_forwardI need help understand on the question of how does the vertical shift compareto the dc level of battery.arrow_forwardA DC generator feeds a load of current 20 A and voltage 220 V. Calculate the electrical motive force generated in the armature if it is known that the resistance of the armature is 0.02 Ω and the resistance of the field is 0.01Ω.arrow_forward
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