Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 30, Problem 20RQ
The motor in Question 19 is connected to a 250-VDC line and has a current draw of 80 A. What is the efficiency of this motor?
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2. a)
i.
ii.
For the circuit presented in Figure 2, Vin = 50 V, turns ratio
between primary and secondary winding is 1:2.
Answer the following questions:
If the duty cycle, D of the switch S1 is 25%, what is the
output voltage Vo?
For this duty cycle, when the switch S1 is turned off, what
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The 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?
Solve and show complete solutions. Choose only from the choices
Chapter 30 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 30 - Prob. 1RQCh. 30 - Prob. 2RQCh. 30 - Prob. 3RQCh. 30 - Prob. 4RQCh. 30 - What type of motor is known as a constant-speed...Ch. 30 - What is CEMF?Ch. 30 - Prob. 7RQCh. 30 - Prob. 8RQCh. 30 - Prob. 9RQCh. 30 - What type of motor should never be operated at no...
Ch. 30 - Prob. 11RQCh. 30 - What is the most common way of changing the...Ch. 30 - Prob. 13RQCh. 30 - Prob. 14RQCh. 30 - What device is used to disconnect power to the...Ch. 30 - Prob. 16RQCh. 30 - Who was the first person to establish a...Ch. 30 - One horsepower is equal to how many W?Ch. 30 - A motor is operating a load that requires a torque...Ch. 30 - The motor in Question 19 is connected to a 250-VDC...Ch. 30 - Prob. 1PA
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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
- You have been given the task of connecting a nine-lead three-phase dual-voltage motor to a 240-V line. You discover that the nameplate has been painted and you cannot see the connection diagram. To make the proper connections, you must know if the motor stator winding is connected wye or delta. How could you determine this using an ohmmeter? Explain your answer.arrow_forwardPlease help me with my last three assignments. This is my last ask an expert, please.arrow_forwardTwo series motors are exactly alike in construction except that the air gap of one is slightly greater than that of the other. When taking 70 A at 600 V, one motor runs at 800 rpm and the other at 850 rpm. If the two motors are mechanically coupled and connected in series across 600 V, at what speed will they run when the current is 70 A? Total resistance of each motor is 0.28 ohm.arrow_forward
- please help me ASAP in my homework please , please draw diagramarrow_forwardRefer to Image. Suppose we apply 160 volts AC to 80 turns of the primary winding but the secondary winding only has 25 turns. What is the turns ratio in this system? Please draw imagesarrow_forward2. The voltage obtained from several coils connected in series is 75 V. What voltage will be obtained if the speed is reduced from 1800 rpm to 1200 rpm?arrow_forward
- To start the 12A 240V motor from the last problem you must reduce the starting current from the power source to 2 times the running current. To do that you have installed a starter with a starter resistor as shown below. This resistor is in the circuit until the switch shown is closed which shorts out the resistor. What size resistor must you use for the resistor (Ohms and Watts)? Starter Resistor = Starter Resistor = 22 W +o 240V 000 1200 STARTER 0.3 Ω 000 E₂ 0.750arrow_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_forwardThree generators are rated as follows: G1: 100MVA, 33kV, xg1 = 0.1pu G2: 150MVA, 32kV, xg2 = 0.08pu G3: 110MVA, 30kV, xg3 = 0.12pu. Determine the reactance of the generator corresponding to base values of 200MVA and 35kVarrow_forward
- A series motor has an armature resistance of 0.20 and a series field resistance of 0.30. It is connected to a 240V supply and at a particular load runs at 24rev/s when drawing 15A from the supply. Calculate the speed of the motor when the load is changed such that the current is increased to 30A. ANSWER: rev/sec Blank 1arrow_forwardA dc generator is capable of producing 120 volts on open circuit. A load of 30 Amperes is connected, and the voltage at the terminals of the generator drops to 100 volts. What is the efficiency of the machine?arrow_forwardA DC generator with an armature resistance of 0.3 ohm and a shunt winding resistance of 125 ohm feeds a 250 Volt DC network. The idle losses of the generator are 750 Watts. What is the efficiency of the generator if it supplies 35A to the grid? la R C RE Darrow_forward
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