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 19RQ
A motor is operating a load that requires a torque of 750 lb-in. and is turning at a speed of 1575 RPM. How much hp is the motor producing?
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A 220 V series motor takes 15 A and runs at 700 rpm. The armature resistance including the resistance of the series winding is 0.8 ohm. At what speed will it run if a 2-ohm resistance is connected in series with supply voltage? Assume the motor is taking the same current.
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a) What power is developed by a motor that turns at 1200 rpm and has a torque of 3.0 N-m?
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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- A 220V. dc series motor is running at a speed of 800 rpm and draws100 A. Calculate at what speed the motor will run when developing halfthe torque. Total resistance of the armature and field is 0.1Ω.arrow_forwardA series motor takes 285A and develops 153 lb-ft torque when operating at 1200rpm. Calculate the torque for a speed of 1700 rpm under condition the current drops to 210A and the flux is decreased by 18%. 50lb-ft 30lb-ft 92.4lb-ft 94.2lb-ftarrow_forwardEA5 kW, 20O V dc shunt motor has armature resistance of 1 ohm and shunt field resistance of 100 ohm. At no load, the motor draws 6 A from 200 V supply and runs at 1000 rpm. What is the total copper loss of the machine? (a) 400 W (c) 36 W (b) 16 W (d) 416 Warrow_forward
- assume that a series motor is taking the same current with the conditions that 440v motor takes a 25 a and runs at 800 rpm the armature resistance including the resistance of the series winding is 0.77ohms calculate the speed will it run if a 1.88 resistance is connected in series with the supply voltagearrow_forwardA 250 V DC shunt motor takes 3 A current under no load condition, it armature resistance is 0.20 ohms and drop in the brush is 0.1V; field resistance is to 250 ohms. Estimate the the efficiency of the machine when it works as a Generator and generates 250V and supplies a current of 25 A to a load. 10 minute please fast please answer fastarrow_forwardPlease do not copy other answers is Wrong other wise I give Downvote. A 200 V dc series motor runs at 700 rpm when operating at its full load current of 20 A. The motor resistance is 0.52 and the be used if magnetic circuit can be assumed unsaturated. What will be speed if the load torque is increased by 44%.arrow_forward
- When the voltage is reduced to start a motor, what happens to the a. torque? b. current?arrow_forwardA dc series motor has an armature resistance of 0.06 Q and series field resistance of 0.08 Q. The motor is connected to a 400 V supply. The line current is 20 A when the speed of the machine is 1100 rpm. When the line current is 50 A and the excitation is increased to 30%, the speed of the machine in rpm is 837 RPM 938 RPM 1003 RPM O 1100 RPM A d.c. series motor takes 40 A at 220 V and runs at 800 r.p.m. If the armature and field resistance are 0.2 Q and 0.1 Q respectively and the iron and friction losses are 0.5 kW, the torque developed in the armature and the output of the motor will be 80.5 N-m , 11.57 kW 96.2 N-m, 10.63 kW 99.3 N-m, 7.82 kWarrow_forwardA dc motor takes an armature current of 105 Amps at 480 V when running at 720 rpm. The resistance of the armature circuit is 0.2 ohm and the field resistance is 96 ohms. What is the torque developed in the armature?arrow_forward
- A series motor develops 164 lb-ft torque when the current is 94A. If the load increases the current 50% with the flux increase of 20%, what is the torque at the second value of current?arrow_forwardKindly please solve what is ask. I want a complete and handwritten solution so that I can understand. Thank you!!'"arrow_forwardA 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 mW and a total field-circuit resistance of 55 W. Answer the following and explain why you chose that answer. (i) What is the motor armature current? 99 A 102 A 107 A 110 A 115 A (ii) What is the CEMF developed in the armature? 9 V 0 V 1 V 3 V 5 V (iii) What is the total windings (copper) losses in the motor? 5 W 1 W 0 W 1145 W 1 Warrow_forward
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