CHAPTER 31 OCEAN CURRENTS TYPES AND CAUSES OF CURRENTS 3100. Definitions The movement of ocean water is one of the two principal sources of discrepancy between dead reckoned and actual positions of vessels. Water in motion is called a current; the direction toward which it moves is called set‚ and its speed is called drift. Modern shipping speeds have lessened the impact of currents on a typical voyage‚ and since electronic navigation allows continuous adjustment of course‚ there is less need to
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obtained from UJT firing circuit is a a) Sine wave (b) saw tooth wave (c)trapezoidal wave (d) Square wave 2. In a thyristor circuit‚ the angle of conduction can be changed by changing (a) anode Voltage (b) Anode Current (c) Forward Current rating (d)gate Current 3. Freewheeling diodes are mainly used for (a) Better utilization factor (b) di/dt protection (c) Quick turn on (d) None 4.The value of dc load voltage for a 1-( semi converter under continuous conduction mode
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The Leeuwin Current is a tropical current‚ consisting of warm‚ low salinity water that affects Western Australia’s coastal waters and wildlife. Currents are part of a large sub circular current system called a gyre. The currents in the Southern hemisphere gyres circulate in an anti-clockwise direction (Skinner‚ Porter & Botkin‚ 1999‚ p.249). There is a current in each of the major oceans that generally flow northwards along the western coast of continents. However‚ the Leeuwin Current flows southwards
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converts electrical energy into mechanical energy. Mechanical Input Electrical input ELECTRICAL MACHINES Generator ELECTRICAL MACHINES Motor Electrical Output Mechanical output If current caring conductor is placed in magnetic field then a force is generated on current caring conductor. F = BIL. Sinθ If all three B and L are Perpendicular to each other‚ then F = BIL If a conductor is moving in magnetic field then an EMF is generated in a conductor . E = BVL.
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Lenora Vidaurrazaga & Christina Meyers CET 402L Senior Project Prof. Kavianpour DeVry University Spring 2005 Project Proposal Due: April 8‚ 2005 Table of Contents: Executive Summary .........1 Introduction . .........2 Project Operation .........7 Project Scheduling (Gannt Chart) .. .......11 Bill of Materials .. .......13 Future Use and Expansion
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the upper specified limit the system may draw excess current which may cause to burn the equipment. The equipment is designed to withstand a specific voltage when ever the voltage goes beyond the limit value then automatically the insulations used in that equipment get punctured and cause a damage to the equipment. Similarly whenever the equipment is applied with a voltage lower then the lower specified voltage it draws excess current to maintain the efficiency. The out put may not be proper
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graphical work. 7. This paper may be retained by the candidate. ELEC4240/9240 - Power Electronics 1 See over for Question 1 QUESTION 1 The input current drawn for an ac source line connected to a power converter is indicated in figure Q1‚ together with the ac input voltage of the line to neutral of the supply. The current waveform is flat-topped quasi-square of amplitude 150A. The ac source voltage is given by v = Vmax sin ω t where Vmax is 340 V‚ ω = 2π f ‚ where f is the supply
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School of Electrical and Electronic Engineering First Year Laboratory Semester 2 Module: Energy Transport and Conversion Code: EEEN10027 Lecturer: Dr Schofield Experiment: 3-Phase power system investigations Aims • • • To introduce 3-phase power systems as a common method to transmit electrical power over long and short distances. To investigate the effects of 3-phase loads on electrical power systems To investigate the differences between DELTA and STAR connections
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CIRCUITS I: ELECTRIC CURRENT 1. What do you predict for the rankings of the brightness of bulbs A‚ B‚ and C in Figure 2-1? A>B>C A being the brightest 2. How do you predict that changing the direction of the current by reversing the connections to the battery in Figure 2-1 would change the rankings in (1)? I don’t think it will change at all. The brightness should be the same in diagram b and diagram a it should also stay the same. 3. How will you compare the currents in the circuits
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across the 200V mains. Find the values of resistance that should be connected across the first bulb‚ so that each bulb may get proper current at the proper voltage. (a) Compare electric circuit and magnetic circuit by their similarities and dissimilarities. (b) Derive an expression for the energy stored in an inductor of self inductance ‘L’ henry carrying the current of ‘I’ amperes. OR (b) A mild steel ring of 30 cm mean circumference has a cross-sectional area of 6 cm2 and has a winding of 500 turns
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