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Student & Learning Zone - City & Guilds
Be posting soon level 2 2330 unit 202 and 203
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<blockquote data-quote="welshwizard" data-source="post: 184" data-attributes="member: 3"><p><strong>Exercise 8</strong></p><p></p><p>1/. Name three factors that affect the size of the induced emf?</p><p></p><p>2/. If the induced e.m.f in a coil is 220 V, it's length per turn is 75 mm and it has 700 turns, what will be its velocity within the magnetic field if its magnetic flux density is 0.35 T?</p><p></p><p>3/. What two rules can be used to determine the direction of the induced e.m.f?</p><p></p><p>4/. A conductor is moved through through a magnetic field of strength 380 mT. If there are 850 turns and the diameter of the former that the coil is wound is150 mm. What will be the force applied to the conductor when it has a current of 0.25 A flowing in it?</p><p></p><p>5/. What is the difference between self and mutual induction, and give an example of each?</p><p></p><p>6/. An electromagnet has an inductance of 14 H. If the current in the coil falls from 2.5 A to 1.1 A in 10 ms, what will be the average induced emf?</p><p></p><p>7/. The current in an air-cored coil increases from 0.5 A to 25 A in 0.25 s. If the inductance is 1.5 H, what will be the induced emf?</p><p></p><p>8/. The coil of an electric bell has an inductance of 2.1 H. Calculate the e.m.f induced in the coil when a current of 0.15 A is reduced to zero in 15 ms.</p><p></p><p>Electrician Forum 2008 (<a href="http://www.electricianforum.co.uk/" target="_blank">www.electricianforum.co.uk</a>)</p></blockquote><p></p>
[QUOTE="welshwizard, post: 184, member: 3"] [B]Exercise 8[/B] 1/. Name three factors that affect the size of the induced emf? 2/. If the induced e.m.f in a coil is 220 V, it's length per turn is 75 mm and it has 700 turns, what will be its velocity within the magnetic field if its magnetic flux density is 0.35 T? 3/. What two rules can be used to determine the direction of the induced e.m.f? 4/. A conductor is moved through through a magnetic field of strength 380 mT. If there are 850 turns and the diameter of the former that the coil is wound is150 mm. What will be the force applied to the conductor when it has a current of 0.25 A flowing in it? 5/. What is the difference between self and mutual induction, and give an example of each? 6/. An electromagnet has an inductance of 14 H. If the current in the coil falls from 2.5 A to 1.1 A in 10 ms, what will be the average induced emf? 7/. The current in an air-cored coil increases from 0.5 A to 25 A in 0.25 s. If the inductance is 1.5 H, what will be the induced emf? 8/. The coil of an electric bell has an inductance of 2.1 H. Calculate the e.m.f induced in the coil when a current of 0.15 A is reduced to zero in 15 ms. Electrician Forum 2008 ([URL="http://www.electricianforum.co.uk/"]www.electricianforum.co.uk[/URL]) [/QUOTE]
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Be posting soon level 2 2330 unit 202 and 203
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