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plz do both and show all steps 1. igumu U, Dulsugust 1 201) A 50 KW,...
QUESTION 1 A) (10 marks) A 10 kW, 250 V DC self-excited shunt generator, with an armature resistance of 0.1 ohm, is delivering 80 % of rated power to the mains at rated voltage when being run at 1000 r.p.m. (revolutions per minute). The field circuit resistance is 220 ohms. The brush contact drop is 0.5 V and rotational (mechanical) losses are 750 W Calculate The induced voltage The electromagnetic torque developed The shaft torque The overall efficiency B) (15...
A short shunt compound generator supplies 50kW at 230V. The shunt field, series field and armature circuit resistances are 46 ohms, 0.02ohms and 0.01ohms respectively. The brush contact drop is 2V. Determine the percent voltage regulation. 3.73% b. 4.55% c. 3.88% d. 3.72% A DC series generator supplies a load of resistance of 1.4 ohms through a pair of feeder conductors of total resistance of 0.1ohms . The voltage at the DC generator terminal is 120 V. What is pd...
In a 110 V compound generator, the resistances of the armature, shunt and series windings are 0.06 ohm, 25 ohm and 0.04 ohm respectively. The load current is 50 A at 120 V. Find the induced e.m.f. and the armature current when the machine is connected as (i) long-shunt and as (ii) short-shunt. How will the ampere-turns of the series field be changed in (i) if a diverter of 0.1 ohm be connected in parallel with the series winding? Allow...
In a 110 V compound generator, the resistances of the armature, shunt and series windings are 0.06 ohm, 25 ohm and 0.04 ohm respectively. The load current is 50 A at 120 V. Find the induced e.m.f. and the armature current when the machine is connected as (i) long-shunt and as (ii) shortshunt. How will the ampere-turns of the series field be changed in (i) if a diverter of 0.1 ohm be connected in parallel with the series winding? Allow...
Q2. (10 points) A 10 kW, 100 V, 1000 rpm dc shunt generator has armature resistance Ra = 0.1.2. The field current generating 100 V at no-load is 1.0 A. The magnetization characteristic at 1000 rpm is shown in figure below. The machine is operated as a separately excited dc generator at 1000 rpm with rated field current. Neglecting the armature reaction effect; (a) Determine full load armature current, la (b) Determine the terminal voltage at full load, with ly...
A long-shunt compound generator running at 1000 r.p.m. supplies 22 kW at a terminal voltage of 220 V. The resistance of the armature, shunt field and series field are 0.05 Ω, 110 Ω, and 0.06 Ω respectively. The overall efficiency at the above load is 88 %. Find (i) Cu losses (ii) iron and friction losses and (iii) torque exerted by the prime mover.
Q3) A 20 kW compound generator works on full load with terminal voltage of 230 V. The armature, series and shunt field resistances are 0.1, 0.05 and 115 ohm respectively. Calculate: a) The generated e.m.f , if connected short shunt. b) The generated e.m.f, if connected long shunt. c) If the machine is connect short shunt, the iron and friction losses at rated power equal to 850 W. calculate the mechanical efficiency, electrical efficiency and commercial efficiency.
a) The input current to a 220 V, short-shunt compound motor at no load is 6 A. The shunt- field circuit resistance is 220 Ω; the armature resistance is 0.112, and the series-field resistance is 0.1 Ω, what is the stray power loss ? (b) Assume the input rating of the motor in Part (a) to be 66 A at 220 V with a no-load speed of 1000 rpm. If the stray power loss varies as the counter-electromotive force and...
part (b)
Q5. The magnetization curve for a shunt DC generator is shown in Figure Q5-1.The generator is rated at 6 kW, 120 V, 50 A, and 1800 r/min and is shown in Figure Q5-2. Its field circuit is rated at 5A Figure Q5-1 The following data are known about the machine: 11r 0.180 120 V R, 24 Ω R.-0.18Ω -0 to 30 2 NF #1000 turns per pole v, Figure Q5-2 The shunt field resistor Radj is adjusted to...
1) A separately excited shunt generator develops 400V at 1900 RPM. a) what will the voltage be at 1200 RPM b) what will be the voltage if the field is reduced by 8% 2) 16.5 HP is needed to drive a generator rated at 12.3 KW, 230V, 50A at 1680 RPM. Ra=.32 ohm. Determine: a) efficiency b) torque ( use T= 9.55 P/n) c) heat loss d) armature voltage 3) At full load a self excited shunt generator delivers 24KW,...