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Problem 1. A 230-V shunt motor delivers 30 hp at the shaft at 1120 rpm. If the motor has an efficiency of 87% at this load, determine (a) the total input power and (b) the line current. (c) If the torque lost due to friction and windage is 7% of the shaft torque, calculate the developed torque. what Problem 2. A motor is supplying 70 N-m of torque to its load. If the motor shaft is turning at 1,500 rpm, is the mechanical power to the load in watts?

Problem 1. A 230-V shunt motor delivers 30 hp at the shaft at 1120 rpm. If the motor has an efficiency of 87% at this load, determine (a) the total input power and (b) the line current. (c) If the torque lost due to friction and windage is 7% of the shaft torque, calculate the developed torque. what Problem 2. A motor is supplying 70 N-m of torque to its load. If the motor shaft is turning at 1,500 rpm, is the mechanical power to the load in watts?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Problem 1. A 230-V shunt motor delivers 30 hp at the shaft at 1120 rpm. If the motor has an efficiency of 87% at this load, determine (a) the total input power and (b) the line current. (c) If the torque lost due to friction and windage is 7% of the shaft torque, calculate the developed torque. Problem 2. A motor is supplying 70 N-m of torque to its load. If the motor shaft is turning at 1,500 rpm, what is the mechanical power to the load in watts?
Transcribed Image Text:Problem 1. A 230-V shunt motor delivers 30 hp at the shaft at 1120 rpm. If the motor has an efficiency of 87% at this load, determine (a) the total input power and (b) the line current. (c) If the torque lost due to friction and windage is 7% of the shaft torque, calculate the developed torque. Problem 2. A motor is supplying 70 N-m of torque to its load. If the motor shaft is turning at 1,500 rpm, what is the mechanical power to the load in watts?
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