1. Design and draw a developed diagram/layout of a simple 2-layer Lap-winding for a 4- pole dc generator with 32 coils. Assume single turn coils and progressive winding type.
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- Fill in the following blanks:1. Lap winding is suitable for ……. Voltage, …… current d.c. generators.2. The critical resistance of the d.c. generator is the resistance of ……. .A d.c.series generator has armature resistance of 0.5Q and series field resistance of 0.032.It drives a load of 50 A.If it has 6 turns/coil and total 540 coils on the armature and is driven at 1500 r.p.m.,calculate the terminal voltage at the load.Assume 4 poles, lap type winding, flux per pole as 2 mWb and total brush drop as 2 V.1A. Which of the following is/are a method of providing field excitation for a DC generator. a) separately excited shunt b) self-excited series c) self-excited shunt d) all of the above 1B. Which type of field winding typically has the higher resistance? a) series b) shunt
- Calculate the flux per pole required on full-load for a 50 kW, 400 V, 8-pole, 600 r.p.m. d.c. shunt generator with 256 conductors arranged in a lap-connected winding. The armature winding resistances is 0.1 Q, the shunt field resistance is 200 Q and there is a brush contact voltage drop of 1 V at each brush on full- [0.162 Wb] 5. load. Calculate the flux in a 4-pole dynamo with 722 armature conductors generating 500 V when running at 1000 r.p.m. when the armature is (a) lap connected (b) wave connected. [(a) 41.56 mWb (b) 20.78 mWb] (City & Guilds, London) 7. A 4-pole machine running at 1500 r.p.m. has an armature with 90 slots and 6 conductors per slot. The flux per pole is 10 mWb. Determine the terminal e.m.f. as d.c. Generator if the coils are lap-connected. If the current per conductor is 100 A, determine the electrical power. [810 V, 324 kW] (London Univ.) 8. An 8-pole lap-wound d.c. generator has 120 slots having 4 conductors per slot. If each conductor can carry 250 A and if…Draw a developed diagram of a simple 2-layer lap-winding for a 4-pole generator with 8 coils.7 A three-phase, 60-cycle, 32-pole synchronous generator has a sinusoidally distributed air-gap flux of 0.025 weber/pole. The armature core has 324 slots. The armature winding is Y-connected. There are two coil sides per slot and two turns per coil. The coil pitch is 9 slots. Find the generated voltage between the line terminals. Ans. 2,445 V
- 6. A 30-kW, 250-V dc long shunt generator has armature, series and shunt field winding resistances of 0.065 Q, 0.10 Q, and 125 Q respectively. It has a maximum efficiency of 88.17%. Determine the voltage regulation at maximum efficiency. Calculate also the voltage regulation and efficiency at 97.77% load.In alternator armature winding why we prefer : a- short pitch winding w.r.t. full pitch winding? b- distributed winding w.r.t. concentrated winding? c- double layer winding w.r.t. single layer winding?1- In alternator armature winding why we prefer : a- short pitch winding w.r.t. full pitch winding? b- distributed winding w.r.t. concentrated winding? c- double layer winding w.r.t. single layer winding? 2- Explain how Y-connected stator winding of alternator requires 58% of turns w.r.t. that of A-connection? 3- A 3-phase, 8-pole, star-connected alternator has 72 slots on the armature. Each slot has 12 conductors and winding is short chorded by 2 slots. Find distributed factor and pitch factor? Note : w.r.t. mean (with respect to)
- A short shunt compound DC generator supplies a load of 10A at a voltage of 10 volts. If the resistances of Armature, shunt field and series field windings are 0.01 ohm, 1 ohm and 0.00 ohm respectively. c) write down the factors to improve the generated voltage. Generated Voltage is 10.2 Val Power Technology A short-shunt d.c. compound generator supplies 250A at 50V. The resistance of armature, series field and shunt field windings are 0.02, 0.08 and 50 ohms respectively. Find the emf generated. The armature current la The generated voltage Eg An 8-pole d.c. generator has 455 armature conductors, and a useful flux of 44 mWb per pole. What will be the e.m.f. generated if it is lap-connected and runs at 1060 rpm? What must be the speed at which it is to driven produce the same e.m.f. if it is wave-wound?A d.c. shunt generator has a full load output of 10 kW at a terminal voltage of 240 V. The armature and the shunt field winding resistances are 0.6 and 160 ohms respectively. The sum of the mechanical and core-losses is 500 W. Calculate the power required, in kW, at the driving shaft at full load, and the corresponding efficiency.