EE331Exam4solutions

EE331Exam4solutions - EE331-15805 Test 4 Preston Closed...

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EE331-15805 Test 4 - Preston - Closed book Your name:_____________________________________ 1 1. (1 point each – 20 total) Write the answer to the left of each question. __________Which direction is the force on a current out of a page that is in a downward magnetic field? __________What is the intensity of the magnetic field inside a copper pipe with a uniform current I? __________What is the name of the inductance for two coils with a common magnetic field? __________Would we label the earth’s geographic north pole as a magnetic north or south pole? __________What kind of iron core losses are caused by reversing the direction of the B field in the iron? __________What kind of component can be used to cancel a lagging power factor of a motor? __________What kind of AC motor has rotor slip? __________What kind of AC motor does not have rotor slip? __________The name of the mechanical part of a motor that does not rotate? __________What kind of motor would you use in a portable vacuum cleaner (high speed)? __________What kind of motor would you use in a refrigerator (for long life)? __________What kind of motor is used for the electric starter in a car? __________What creates the magnetic field in a coil of wire? __________For a magnetic circuit model, what is the resistance to the magnetic field called? __________The name of the law that says currents will be induced to resist a changing magnetic field? __________What is material property μ called that is used in the formula B=μH? __________A material commonly used in very high frequency toroid coils? __________The kind of motor that uses aluminum bars for the rotor?

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This note was uploaded on 09/01/2010 for the course EE 331 taught by Professor Preston during the Spring '06 term at University of Texas.

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EE331Exam4solutions - EE331-15805 Test 4 Preston Closed...

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