A short shunt compound generator supplies 50kW at 230V. The shunt field, series field and armature...
- 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 at the load?
- 112V b.113v c. 114v d. 115v
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A short shunt compound generator supplies 50kW at 230V. The
shunt field, series field and armature...
Complete solutions please :) 4. A 100kw, 230V, shunt generator has an armature resistance and field...
Complete solutions please :)
4. A 100kw, 230V, shunt generator has an armature resistance and field resistance of 0.05Ω and 57.5Ω. If the generator operates at rated voltage a) Calculate the induced voltage contact drop b) Horsepower output from the at half-load, neglect the brush fィ If SPL is 1.8kW, calculate prime mover to drive the generator at this load c) At what load does the generator achieve maximum d) What is the value of this maximum efficiency? f) Determine...
In a 110 V compound generator, the resistances of the armature, shunt and series windings are...
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...
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...
A long-shunt, cumulatively compounded dc generator has 1800 shunt-field turns per pole and 12 series-field turns...
A long-shunt, cumulatively compounded dc generator has 1800 shunt-field turns per pole and 12 series-field turns per pole. The armature resistance is 0.12 ohm, the series-field resistance is 0.04 ohm, and the shunt-field resistance is 210 ohms Data for the open-circuit characteristic at 1700 r/min is as follows: Volts 110 200 280 300 Amperes 0.5 1.9 2.35 The generator supplies a load of 15 kW at 200 V when it is driven at 1700 r/min. Determine the speed at which...
A DC shunt generator delivers a load current of 50 A at 300 V with its...
A DC shunt generator delivers a load current of 50 A at 300 V with its field circuit resistance being 50 ohms. The armature circuit resistance of the generator is 2 ohms The generator has a linear excitation with a constant rotor speed. The brush voltage drop is negligible. Aiding with a drawing of equivalent circuit, estimate: i) The field current, armature current and generated voltage of the generator when it delivers the 100 A at 300V; and (ii) The...
3. Each pole of a 100 kW, 250 V short-shunt flat-compound generator has a shunt field...
3. Each pole of a 100 kW, 250 V short-shunt flat-compound generator has a shunt field of 2000 turns and a series field of 7 turns. If the series-field resistance is 0.01 and total shuntfield resistance is 100 2. Calculate the mmf when the machine operates at (a) no-load and (b) full-load Circuit Calculation(s) ha armature is connecte A permanent magnet dc motor tumsa source. Calculate the armature voltage requin (b) 1600 rpm. Neglect armature resistance. Circuit agnet de motor...
QUESTION 1 A) (10 marks) A 10 kW, 250 V DC self-excited shunt generator, with an...
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) The input current to a 220 V, short-shunt compound motor at no load is 6 A. The shunt- field c...
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...
A long-shunt compound generator running at 1000 r.p.m. supplies 22 kW at a terminal voltage of...
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.
12. What is it about the poles pieces of a DC generator that determines if it...
12. What is it about the poles pieces of a DC generator that determines if it will be called a magneto? 13. Name two parts of a DC generator that are made of iron: a. b. 14. Draw a schematic of a series DC generator. Draw a schematic of a shunt DC generator. 15. Why must a “self-excited” series generator have a load connected in order for current to flow in the field, whereas a self-excited shunt generator does not...
Complete solutions please :)
4. A 100kw, 230V, shunt generator has an armature resistance and field resistance of 0.05Ω and 57.5Ω. If the generator operates at rated voltage a) Calculate the induced voltage contact drop b) Horsepower output from the at half-load, neglect the brush fィ If SPL is 1.8kW, calculate prime mover to drive the generator at this load c) At what load does the generator achieve maximum d) What is the value of this maximum efficiency? f) Determine...
A long-shunt, cumulatively compounded dc generator has 1800 shunt-field turns per pole and 12 series-field turns per pole. The armature resistance is 0.12 ohm, the series-field resistance is 0.04 ohm, and the shunt-field resistance is 210 ohms Data for the open-circuit characteristic at 1700 r/min is as follows: Volts 110 200 280 300 Amperes 0.5 1.9 2.35 The generator supplies a load of 15 kW at 200 V when it is driven at 1700 r/min. Determine the speed at which...
A DC shunt generator delivers a load current of 50 A at 300 V with its field circuit resistance being 50 ohms. The armature circuit resistance of the generator is 2 ohms The generator has a linear excitation with a constant rotor speed. The brush voltage drop is negligible. Aiding with a drawing of equivalent circuit, estimate: i) The field current, armature current and generated voltage of the generator when it delivers the 100 A at 300V; and (ii) The...
3. Each pole of a 100 kW, 250 V short-shunt flat-compound generator has a shunt field of 2000 turns and a series field of 7 turns. If the series-field resistance is 0.01 and total shuntfield resistance is 100 2. Calculate the mmf when the machine operates at (a) no-load and (b) full-load Circuit Calculation(s) ha armature is connecte A permanent magnet dc motor tumsa source. Calculate the armature voltage requin (b) 1600 rpm. Neglect armature resistance. Circuit agnet de motor...
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) 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...
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