Neiep 400 final exam study guide with correct answers latest update 2024., Exams of Study of Commodities

Download Neiep 400 final exam study guide with correct answers latest update 2024. and more Exams Study of Commodities in PDF only on Docsity! Neiep 400 final exam study gu ide with correct answers latest update 2024. 1. If your meter readings appear incorrect, what do you do? - Correct answer Compare with a known good meter 2. What is synchronous speed? - Correct answer The rotational speed of the stators magnetic field on an Induction motor. 3. What is the purpose of interpoles? - Correct answer They prevent neutral plane shift 4. What shifts the neutral plane in the direction of rotation in generators? - Correct answer Armature reaction 5. 420 pg 4 6. What reduces eddy currents in the field pole pieces? - Correct answer Laminations 7. 420 pg 7 8. What is saturation? - Correct answer When no more magnetic lines can be produced. 9. 415 pg 6 10.What waveform does a commutator produce? - Correct answer Ripple unlike slip rings 11.415 pg 15 12.What should you do when changing meter ranges? - Correct answer Disconnect meter from circuit 13.What item would reduce the risk of shock when taking voltage readings? - Correct answer Insulated hard hat 14.0.49k ohm converted - Correct answer 490 ohms 15.How to use precision shunts? - Correct answer Requires the the circuit under test is open and the shunt inserted (in series with the load) 16.What is the % of slip of a 60Hz 4 pole motor that rosters at 1745rpm? - Correct answer 3.05% 17.Sync rpm- rotor rpm x100 18.Divided by sync rpm 19.Before using a megger, what must be done? - Correct answer Isolate 20.What kind of windings is used for high current and what kind for high voltage? - Correct answer High current- loop winding 21.High voltage- wave windings 22.Calculating transformer efficiency % - Correct answer EP x IP= A ES x IS= B 23.Divide A and B 24.Primary has 600 turns & 200 on the 2nd, with 120v on the primary. What is the secondary voltage? - Correct answer NP over NS. VP over VS 25.600 over 200. 120v over ? 26.120x200= 24,000 27.24,000 divided by 600=40vs 28.Where do you find the max armature voltage? - Correct answer Data tag/ name plate 29.What must be done to measure resistance in a circuit? - Correct answer Power and disconnect one end of the circuit 30.What is the symbol for Dc current - Correct answer You all should know this 31.What type of generator uses a series and a shunt field on a common pole pieces? - Correct answer Compound 32.What material is used to insulate the commutator from the armature shaft? - Correct answer Mica 33.Which motor uses a stator to act as a rotating field? - Correct answer 34.AC induction motor - Correct answer 35.How do you restore magnetism to an exciter? - Correct answer Flashing the field (battery) 36.What circuit is used for preventing build-up of circulating current when the generator field is de-energized? - Correct answer Suicide 37.What color should a commutator be? - Correct answer Chocolate brown 38.Do you have to disconnect wires when using a clamp on meter? - Correct answer No 39.What are the 4 things that make up the commutator film? - Correct answer - copper oxide 40. -water vapor