Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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Chapter 7, Problem 23P
If a generator is 80% efficient and delivers 45 W to a load, what is the input power?
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Chapter 7 Solutions
Electronics Fundamentals: Circuits, Devices & Applications
Ch. 7 - The tesla (T) and the gauss (G) are both units for...Ch. 7 - The unit for measuring magnetomotive force (mmf)...Ch. 7 - Ohm’s law for a magnetic circuit gives the...Ch. 7 - A solenoid is a form of electromagnetic switch...Ch. 7 - A hysteresis curve is a plot of flux density (B)...Ch. 7 - To produce an induced voltage in a coil, the...Ch. 7 - Prob. 7TFQCh. 7 - Prob. 8TFQCh. 7 - Prob. 9TFQCh. 7 - Prob. 10TFQ
Ch. 7 - Prob. 1STCh. 7 - Prob. 2STCh. 7 - Prob. 3STCh. 7 - Prob. 4STCh. 7 - Prob. 5STCh. 7 - Prob. 6STCh. 7 - Prob. 7STCh. 7 - The electromagnetic activation of a movable shaft...Ch. 7 - When there is current through a wire placed in a...Ch. 7 - Prob. 10STCh. 7 - Prob. 11STCh. 7 - Prob. 12STCh. 7 - Prob. 13STCh. 7 - Prob. 14STCh. 7 - Prob. 15STCh. 7 - The cross-sectional area of a magnetic field is...Ch. 7 - In a certain magnetic field the cross-sectional...Ch. 7 - Wha is the flux in a magnetic material when the...Ch. 7 - At a given location, the earth’s magnetic field...Ch. 7 - A very strong permanent magnet has a field of...Ch. 7 - Prob. 6PCh. 7 - What is the relative permeablility of a...Ch. 7 - Determine the reluctance of a material with a...Ch. 7 - What is the magnetomotive force in a 500 turn coil...Ch. 7 - Typically, when a solenoid is activated, is the...Ch. 7 - Prob. 11PCh. 7 - Explain the sequence of events in the circuit of...Ch. 7 - Prob. 13PCh. 7 - What is the magnetizing force in Problem 9 if the...Ch. 7 - How can the flux density in Figure 7-51 be changed...Ch. 7 - In Figure 7-51, determine the following if the...Ch. 7 - Determine from the hysteresis curves in Figure...Ch. 7 - According to Faraday’s law, what happens to the...Ch. 7 - The voltage induced across a certain coil is...Ch. 7 - Prob. 20PCh. 7 - A 20 cm long conductor is moving upward between...Ch. 7 - Prob. 22PCh. 7 - If a generator is 80% efficient and delivers 45 W...Ch. 7 - Prob. 24PCh. 7 - If the output voltage in Problem 24 is 14 V, what...Ch. 7 - Prob. 26PCh. 7 - Prob. 27PCh. 7 - A basic one-loop de generator is rotated at 60...Ch. 7 - Assume that another loop of wire. 90 from the...
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- 4-ls the residual magnetism on the generator is necessary how can you cancel these residual magnetism in D.c generatorarrow_forwardThe voltage generated by a dc generator is 230V, determine the generated emf if the speed is increased by 20% and the flux is simultaneously reduced by 10%.arrow_forwardA 30kW generator has an armature resistance of 0.45 ohms, generates a terminal voltage of 225 V at full load. Neglect field current and field copper loss. Iron and mechanical losses are 2.4kW. What will be the efficiency of the generator?arrow_forward
- 1. Smaller aircraft normally use these types of generators. Choose all the correct answers. 2. When the resistance in a DC resistive circuit increases, what happens to the circuit current?arrow_forwardA 243.5 shunt Generator generates 4.5 Amps. Its Armature resistance is 1.1 Ohms. What is the Generated emf of the DC Generator?arrow_forwardWhat are the conditions that may be satisfied so that two different generators shall share a load in proportion to their powers?arrow_forward
- When generator is being driven at 1200 rpm, the generated emf is 230V. What is the generated emf if the field flux is decreased by 10% with the speed remain unchanged?arrow_forwardA shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed? *arrow_forwardHow do you find the frequency of this generator given the information that is listed? I tried doing 1/T but it does not give me the correct answer which should be 12.5 Hz.arrow_forward
- A 50kW, 500V short shunt generator has an armature resistance, series field resistance and shunt field resistances are 0.05 ohms, 0.06 ohms and 253 ohms respectively. What is the power generated?arrow_forwardAn alternator has 6 poles and runs at 1,000 rpm (a) what is its generated frequency? (b) What must be its speed if the frequency is to be 25 Hz?arrow_forwardThe voltage induced in a generator is 110 V when the armature rotates at 1100 r/min. What will the voltage be if the speed is increased to 1200 r/min? A generator operating at 1850 r/min develops a voltage of 130 V. What must be the speed of the generator for a voltage of 120 V?arrow_forward
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