Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Question
Chapter 47, Problem 12RQ
To determine
The size of the conductor that should be used to supply all the motors when the 5 horsepower, three phase motor with the NEMA code B is connected to the 240 V line, the conductor are copper with type THWN insulation.
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A (21 HP, 3-Phase, 380 volts) motor with an efficiency of 95% is operating at a load
factor of 0.63. What is the input current (Amperes) when the power factor is 89%? (1
HP = 0.75 kW)
A 20 HP, DC motor is connected to a 500-volt DC line. What is the full load running current of this motor?
A transformer has a primary voltage of 480 volts and a secondary voltage of 20 volts. What is the turns ratio of the transformer?
Chapter 47 Solutions
Industrial Motor Control
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- Assume that a line voltage of 2400 volts is connected to the primary of the three-phase transformer and the line voltage of the secondary is 240 volts. What is the turns ratio of the transformer?arrow_forwardEx: A single phase 50 KVA transformer has primary voltage of 6600 v and secondary voltage of 254 v and has 32 secondary turns. Calculate the number of primary turns and primary and secondary currents.arrow_forwardQ A motor of 15 horsepower, has a code letter L, and is operated on a 400-volt line. Find the locked rotor currentarrow_forward
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