Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
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?
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
Can you show me how to solve the following question?
What will be the rate of energy use of a small motor rated at one-fifth horsepower?
A Wattmeter measures the input power of the motor in Question 13 to be 5650 W. What is the efficiency of the motor?
13.A Squirrel-cage induction motor is operating at 1175 rpm and producing a torque of 22 lb-ft.
What is the horsepower output of the motor?
A dc series motor drives a load a 30rev/s and takes a current of 10A when the supply voltage is 400V. If the total resistance of the motor is 2Ω and the iron, friction and windage losses amount to 300W , determine the efficiency of the motor
ANSWER:_______________%
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
Knowledge Booster
Learn more about
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
- Q51 Which NEC table is used to determine the full-load current of a torque motor? Select one: A. NEC TABLE 430.6(B) B. NEC TABLE 430.7(B) C. NEC TABLE 430.24 D. NEC TABLE 430.22arrow_forwardA wattmeter measures the input power of the motor in Question 13 to be 5650 W. What is thee efficiencyof the motor? 13. A squirrel-cage induction motor is operating at 1175 rpm and producing a torque of 22 lb-ft. What is the horsepower output of the motor?arrow_forwardA dc series motor drives a load a 30rev/s and takes a current of 10A when the supply voltage is 400V. If the total resistance of the motor is 2ohms and the iron, friction and windage losses amount to 300W, determine the efficiency of the motor.arrow_forward
- Below is a diagram of a DC motor and the mechanical load connected to it. Which statement is wrong? A. The speed of the motor ea increases with increasing B. The torque of the motor increases with increasing ia C. eb increases and speed decreases D. if increasing. the torque of the motor increases E. Nonearrow_forward5. WHAT IS A "TORQUE"? 6. CITE THE DIFFERENT FORMULAS INVOLVED IN THE OPERATION OF DC MOTOR. 7. EXPLAIN THE POWER STAGES WHEN THE DC MOTOR UNDER OPERATIONS 8. PROVE THAT A CAPACITY OF DC MOTOR, 1HP = 746 Wattarrow_forwardA DC motor is fed with the armature voltage 430 V. At the current load, the speed is 180 rpm and the armature current is 29 A. The armature resistance of the motor is 0.9 Ω and the brush voltage drop is a total of 2.5 V. The shaft torque is 72 Nm and the magnetizing current is 0.87 A at the magnetizing voltage 494.5 V. a) What electrical power does the motor receive? b) what is the mechanical effect that the engine develops? c)determine the efficiency of the motor at this load d) how big will the speed be at half the load torque? (Armature voltage and magnetizing current are unchanged.) Tip: First calculate the motor's k2Fi value - half Half the torque gives half the armature current. e) The speed at idle is approximately (whole number with two decimal places)arrow_forward
- A d.c. series motor drives a load at 30 rev/s and takes a current of 10 A when the supply voltage is 400V. If the total resistance of the motor is 2 ohm and the iron, friction and windage losses amount to 300 W, the efficiency of the motor is?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_forwardPlease help me with my three assignments, please :(( 3.The armature of a 4 pole DC motor carries 314 conductors which are connected. for an armature current of 20 A. the torque produced has to be 50 N-m. Determine the required flux per pole. 4.An electric motor Develops 30 HP at a speed of 600 RPM. What is the torque in Newton - meter. 5.A motor has a name plate rating of 15 KW and 1160 RPM solve for the rated torque at full load.arrow_forward
- A 400 V Shunt machine runs at 1300 rev/min. if the shunt field resistance is 30 Ω, the armature resistance is 0.25 Ω, and iron, friction, and windage losses amount to 1.2 kW, determine the overall efficiency of (a) as a motor consuming 80 A (b) as a generator generates 70 A.arrow_forwardDC/AC MOTOR (UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS LEGIBLY. NO LONG EXPLANATIONS NEEDED. ANSWER IN 2 DECIMAL PLACES. BOX THE FINAL ANSWER.) A 200V shunt motor develops 23hp, when taking 20.2 kW. The field resistance is 50 ohms and the armature resistance is 0.06 ohm. What is the total losses? a. 2512 W b. 1756 W c. 3718 W d. 3042 Warrow_forward3. Calculate the torque in newton-metre developed by a 440-V d.c. motor having an armature resistance of 0.25 Ω and running at 750 r.p.m. when taking a current of 60 A.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning
Power vs Torque - In Depth Explanation and Mythbusting; Author: kyle.Engineers;https://www.youtube.com/watch?v=X7KWtf4wqN4;License: Standard Youtube License