
A ten-pole wave-connected armature is 1 point wound with 460 conductors. The magnetic flux and the...
The armature of a 6-pole separately excited dc generator is lap wound with 534 conductors. This machine delivers power to the load at 250V while being driven at 1000 rpm. At this load, the armature circuit dissipates 640W. If the flux per pole of this generator is 30-mWb, determine the kW rating of the load served.Assume a total brush contact drop of 2V.
A 4-pole, lap wound, d.c machine has total number of 800 armature conductors and produces 0.03 Wb flux per pole when field is excited. If the machine is driven by a prime mover at 1000 rpm, calculate the generated emf across the armature. If the generator is loaded to deliver an armature current of 50 A, Calculate the prime mover and electromagnetic torques developed at this load current. Neglect frictional torque.
Show all working 1. A 4 pole, 220 V, 10 H.P, d.c. shunt motor is rotating at a speed of 320 rpm. Then the developed useful torque is 2. A 4 pole, lap wound d.c. motor drawing an armature current of 20 A has 360 conductors. If the flux per pole is 0.015 Wb then the gross torque developed by the armature of motor is 3. A 220 V, d.c. motor draws an armature current of 20 A. Its armature...
A 6 pole D-C generator has an armature winding with 684 conductors connected in 12 parallel paths. Calculate the generated voltage in this machine if each pole produces 8410000 maxwells and the armature speed is 1410 rpm. 675.9117 677.9118 677.9117 675.9118 The armature winding of a 6 pole D-C generator has 192 conductors connected in 12 parallel paths. At what speed should the machine be driven if it is to develop 220.4608 volts if each pole produces 1.036E+07 maxwells. 1335...
Question: A 4-pole Direct Current (DC) armature wave winding has 294 conductors: (i) What flux per pole is necessary to generate 230 V when rotating at 1500 revolutions per minute (rpm)? (ii) What is the electromagnetic torque at this flux when rated armature current of 120 A is flowing? (iii) How many interpole ampere turns are required with this current if the interpole gap magnetic flux density is to be 0.15 tesla and the effective radial air gap is 8 mm....
Question 39. A 4-pole Direct Current (DC) armature wave winding has 294 conductors: (i) What flux per pole is necessary to generate 230 V when rotating at 1500 revolutions per minute (rpm)? (ii) What is the electromagnetic torque at this flux when rated armature current of 120 A is flowing? (iii) How many interpole ampere turns are required with this current if the interpole gap magnetic flux density is to be 0.15 tesla and the effective radial air gap is...
A6 A 8-pole lap wound armature rotated at 600 rpm is designed to generate 240 V. The flux per pole is 0.06 Wb and the armature has 100 slots. (a) Determine the suitable number of conductors for each of the slot. (b) Based on the result found in part (a), calculate the armature voltage if its winding is changed to a wave winding and the motor speed is decreased to 200 rpm. (3 marks) (2 marks) A7 Elaborate the merits...
A 3-phase, 600 kVA, 600 V, 60 Hz, 16 pole, Y-connected, round rotor synchronous motor has Xs = 0.492 22 and a negligible armature resistance. The motor is supplied from a 589V infinity bus, and draws 520 kW of real power at a 0.9 leading power factor. Its mechanical loss at the synchronous speed is 20 kW and the core loss is 15 kW. a) [7 marks] Calculate the generated voltage Ef , the load angel 8, and the efficiency...
A 2300 V (terminal voltage), 1000 kVA, 0.8 PF lagging, 60-Hz, two pole, Y connected synchronous generator has a synchronous reactance of 1.1 2 and an armature resistance of 0.15 Ω. At 60Hz, its friction and windage losses are 24 kW, and its core losses are 18 kW The field circuit has a dc voltage of 200 V, and the maximum If Ir is 10 A. The resistance of the field circuit is adjustable over the range from 20 to...
2) (a) Describe the principle of operation of 3-phase induction motor. [8 Marks](b) Explain slip as applied to three phase induction motor. [2 Marks]3) Derive an expression for the total armature torque of DC motor. [10 Marks]5) List the starting methods used in starting 3-phase induction motors and explain any two of these methods. [10 Marks]6) (a) A 60 kW, 400 V d.c. shunt motor has 4 poles a 2-circuit wave-connected armature winding with 450 conductors. The flux per pole...