Electrical machines

Question

Question

Electrical machines

A 220 V shunt motor takes 105 A. The armature resistance 0.08 Ω and shunt filed resistance is 44 Ω. The motor runs at 950 r.p.m. If iron and friction losses are equal to 2 kW, find (i) brake horse power (b.h.p.), (ii) total torque and (iii) shaft torque.

Add a comment Improve this question Transcribed image text

Answer 1

Answer #1

Supply voltage V = 220 V. Current Il 3105 A. Ra=0.oon, Rsh 2442 motos. speed N = 950 rpm. Iron &friction losses = akw. Tught output power Pont Pin Total locs. - 23100-3900 output powes = 19.260. Brake House power (849)- 1912,8/03 735.5 BHP - 26.105 H

Add a comment

Answer 2

Similar Homework Help Questions

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.
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...
Electrical DC Machines

Question (1)Explain with relevant diagrams, resistance commutation and how it helps in improving commutation. Question (4)A 240 V, 4 – pole shunt motor running at 1000 r.p.m. gives 15 h.p. with an armature current of 50 A and field current of 1 A. The armature winding is wave connected and has 540 conductors. The armature resistance is 0.1 Ω and the drop at each brush is 1 V. Calculate (i) the useful torque (ii) the total torque (iii) useful flux per pole and (iv)...

1. A 300 V compound motor has armature resistance 0.18 Ω, series field resistance 0.3 Ω...

1. A 300 V compound motor has armature resistance 0.18 Ω, series field resistance 0.3 Ω and shunt field resistance 100 Ω. The rotational losses are 200 W. On full load the line current is 25 A and the motor runs at 1800 rpm. Determine: (i) the developed mechanical power (ii) the output power (iii) the output torque (iv) the efficiency at full load 2. A 120 V series motor has 0.2 Ω field resistance. On full load, the line...
Electrical Machine

Question (1)Explain with relevant diagrams, resistance commutation and how it helps in improving commutation. Question (4)A 240 V, 4 – pole shunt motor running at 1000 r.p.m. gives 15 h.p. with an armature current of 50 A and fieldcurrent of 1 A. The armature winding is wave connected and has 540 conductors. The armature resistance is 0.1Ω and the drop at each brush is 1 V. Calculate (i) the useful torque (ii) the total torque (iii) useful flux per poleand (iv)...
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...

Electrical Machines

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...
Question (2) A 4-Pole, 220 V shunt motor has 540 lap-wound conductors. It takes 32 A...

Question (2) A 4-Pole, 220 V shunt motor has 540 lap-wound conductors. It takes 32 A supply main and develops output power of 5.595 kW. Shunt field and armature resistance are 2202 and 0.092 respectively and flux per pole is 30 mWb. Calculate () the speed (ii) Calculate starting current (i) Calculate current flowing through armature at speed of 500 rpm (v) Shaft torque at speed calculated in (1)
1. A shunt machine, while running as a generator, has an induced voltage of 260 V...

1. A shunt machine, while running as a generator, has an induced voltage of 260 V at 1200 rpm. Its armature and field resistances are 0.2 2 and 110 Q, respectively. If the machine is run as a shunt motor, it takes 4 A at 220 V (i) Draw the schematic diagram of the machine as a generator. (ii) Draw the schematic diagram of the machine as a motor (iii)At a certain load the motor takes 30 A at 220...

Show all working 1. A 4 pole, 220 V, 10 H.P, d.c. shunt motor is rotating...

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...

Electrical machines

Homework Answers

Add Answer to:
Electrical machines

Post as a guest

Earn Coins

A long-shunt compound generator running at 1000 r.p.m. supplies 22 kW at a terminal voltage of...

QUESTION 1 A) (10 marks) A 10 kW, 250 V DC self-excited shunt generator, with an...

Electrical DC Machines

1. A 300 V compound motor has armature resistance 0.18 Ω, series field resistance 0.3 Ω...