Question

B// A 4- pole 220 V, lap wound shunt D.C motor runs at 800 rpm takes...

B// A 4- pole 220 V, lap wound shunt D.C motor runs at 800 rpm takes 35 A. The shunt field resistance is 110 Ω and armature resistance is 0.4 Ω iron and friction losses is 800 W. Find. a- Maximum efficiency. b- The resistance sections of starter connected to this motor by using same armature resistance and voltage supply from above. if maximum armature current is 50 A and the resistance of first section is 1.95 Ω

Engineering   Electrical-Engineering   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A 60 kW, 400 V d.c. shunt motor has 4 poles a 2-circuit wave-connected armature winding...
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 is 45 mWb. The full-load efficiency of the motor is 90.5%. The armature and interpole windings have a total resistance of 0.1 Ω. The shunt field resistance is 200 Ω. Calculate (i) the line current (ii) full-load speed and (iii) armature torque.
1) A DC machine induces an EMF of 240 v at 1500 rpm. Find the developed...
1) A DC machine induces an EMF of 240 v at 1500 rpm. Find the developed torque for an armature current of 25A. 2) Draw and explain all characteristics of d.c. Shunt motor. 3) State accessitivity of 3 point starter. 4) A four pole wave connected dc armature has 50 slots with 10 conductors per slot. The armature is rotated at 1000 rpm of the useful flux per pole is 30mwb, calculate the amount of EMF induced. 5) A 6...
Known that a Friction and iron losses are 0.5 KW. A shunt connected dc machine driven...
Known that a Friction and iron losses are 0.5 KW. A shunt connected dc machine driven by supplies current of 45 A with 220V and runs at 800 rpm. The armature and field resistance are 0.2 ohm and 0.1 ohm respectively. Find out the efficiency
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.
The full-load armature current of a 5 hp, 150 V shunt dc motor is 30 A....
The full-load armature current of a 5 hp, 150 V shunt dc motor is 30 A. The field (shunt) resistance and the armature resistance of the motor are ????F = 125 ? and ???????? = 0.15, respectively. At a random speed of 1800 rpm magnetization curve of the motor has measured and is shown in the table below. ????0 (V) armature voltage 10 90 110 140 170 185 ???????? (A) field (shunt) current 0 0.82 1 1.2 1.7 2.88 Calculate...
Question 2 The full-load armature current of a 5 hp, 150 V shunt dc motor is...
Question 2 The full-load armature current of a 5 hp, 150 V shunt dc motor is 30 A. The field (shunt) resistance and the armature resistance of the motor are ????F=125 ? and ????????=0.15, respectively. At a random speed of 1800 rpm magnetization curve of the motor has measured and is shown in the table below. EO(V) armature voltage 10 90 110 140 170 185 IF (A) field (shunt) current 0 0.82 1 1.2 1.7 2.88 Calculate the following: a....
An 800 rpm, 500 V, 120 A (armature current), series motor has a field resistance of...
An 800 rpm, 500 V, 120 A (armature current), series motor has a field resistance of 0,04 Ω and an armature resistance of 0.11 Ω. Determine the speed of the motor: 2.1 For a supply voltage of 550 V and a current of 60 A. (9) 2.2 For a torque of 50% of full-load, a supply voltage of 500 V and a diverter across the field of 0.08 Ω. (11) 2.3 With a resistance of 1 Ω in series with...
A 200 V DC, 1,800 RPM shunt connected motor has an armature resistance of 0.4 ohm...
A 200 V DC, 1,800 RPM shunt connected motor has an armature resistance of 0.4 ohm and a brush resistance of 0.4 ohm; brush voltage drop of 6.0 V, independent of load. The resistance of the shunt field is 230 ohm. The full load rated line current is 40 A. When the motor is operated at no load the line current is 5 A and the speed is 1750 RPM. Calculate speed at rated load Calculate speed at .3 rated...
a)Explain the shunt excitation and compound excitation of DC generator. b)A 240V compound DC motor has...
a)Explain the shunt excitation and compound excitation of DC generator. b)A 240V compound DC motor has the armature, series field and shunt field resistances are 0.22 Ω, 0.04 Ω and 200 Ω respectively. On full load, the line current is 17.5 A and the motor runs at 1800 rpm. (short shunt) i) Draw the diagram and the power flow of the motor. ii) Find the back EMF of the motor. iii) Find the mechanical power developed. iv) Find the output...
A 5-kW, 220-V shunt motor has an armature resistance of 0.15 ? and a field-circuit resistance...
A 5-kW, 220-V shunt motor has an armature resistance of 0.15 ? and a field-circuit resistance of 100 ?. The motor delivers rated output power at rated voltage when its armature current is 20 A. When the motor is operating at rated voltage, the speed is observed to be 1000 r/min when the machine is loaded such that the armature current is 15 A. In order to protect both the motor and the dc supply under starting conditions, an external...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT