Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 15, Problem 20RQ
To determine
The efficiency of the motor.
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Find the horsepower rating of a motor running at 1,500 rpm and developing a torque of 105 lb–ft.
(a). 22 (b). 28
(c). 30 (d). 36
A motor is operating a load that requires a torque of 750 pounds per inch and is turning at a speed of 1575 RPM. How much horsepower is the motor producing?
How does the motor work of a simple electromagnetic works?
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Electrical Transformers and Rotating Machines
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A motor develops 189 ft-lb of torque at 1745 RPM. What is the horse-power output of the motor?arrow_forwardAssume that a primary current of 75 amperes flows through the windings of the transformer in question 4. How much current will flow in the secondary winding?arrow_forwardA motor is operating a load that requires a torque of 750 lb–in and is turning at a speed of 1,575 RPM. How much horsepower is the motor producing?arrow_forward
- A motor develops 225 ft-lb of torque at 860 RPM. What is the horsepower output of the motor?arrow_forwardIf the secondary of the transformer in question 5 supplies a current of 9.6 amperes to a load, what is the primary current? (Disregard excitation current.)arrow_forwardA CT has a current flow of 80 amperes in its primary winding and a current of 2 amperes in its secondary winding. What is the ratio of the CT?arrow_forward
- The electrical energy consumed by a motor is inversely proportional to its efficiency.arrow_forwardA current transformer has 4 turns of wire in its primary winding. How many turns of wire are needed in the secondary winding to produce a current of 2 amperes when a current of 60 amperes flows in the primary winding?arrow_forwardWhat is the full-load running current of a three-phase, 50-hp motor connected to a 560-volt line? What are the minimum size NEMA and IEC starters that should be used to connect this motor to the line?arrow_forward
- If a single-phase load is connected across the two line conductors and neutral of the transformer in question #2, and one line has a current of 80 amps and the other line has a current of 68 amps, how much current is flowing in the neutral conductor?arrow_forwardThe short-circuit protective device supplying the motors in question #10 is an inverse-time circuit breaker. What size circuit breaker should be used?arrow_forwardWhat is the frequency (in Hz) of a motor spinning at 1740 rpm?arrow_forward
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