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37. Motors are usually rated in terms of their horsepower output. In order to calculate the efficiency, the power (output and input) must be in the same unit of measurement. An electric motor on a forklift is rated at 10 hp. The input current to the motor is 70 A at 120 V. What is the efficiency of the motor? (a) 76.7% (c) 100% (b) 88.6% (d) 91.4%

37. Motors are usually rated in terms of their horsepower output. In order to calculate the efficiency, the power (output and input) must be in the same unit of measurement. An electric motor on a forklift is rated at 10 hp. The input current to the motor is 70 A at 120 V. What is the efficiency of the motor? (a) 76.7% (c) 100% (b) 88.6% (d) 91.4%

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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37. Motors are usually rated in terms of their horsepower output. In order to calculate the efficiency, the power (output and input) must be in the same unit of measurement. An electric motor on a forklift is rated at 10 hp. The input current to the motor is 70 A at 120 V. What is the efficiency of the motor? (a) 76.7% (c) 100% (b) 88.6% (d) 91.4% 38. A compressor motor delivers 20 hp to the pump. If the motor is 75% efficient, what is the kW input to the motor? (a) 19.893 kw (c) 20.67 kw (b) 18.2 kw (d) 21 kw
Transcribed Image Text:37. Motors are usually rated in terms of their horsepower output. In order to calculate the efficiency, the power (output and input) must be in the same unit of measurement. An electric motor on a forklift is rated at 10 hp. The input current to the motor is 70 A at 120 V. What is the efficiency of the motor? (a) 76.7% (c) 100% (b) 88.6% (d) 91.4% 38. A compressor motor delivers 20 hp to the pump. If the motor is 75% efficient, what is the kW input to the motor? (a) 19.893 kw (c) 20.67 kw (b) 18.2 kw (d) 21 kw
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