Electrical Problems

Two alternating currents in a parallel circuit are represented by i_1=5 sin(omega)t and i_2=10 sin((omega)t +60 degree). Find the resultant current. Problem Question Two alternating currents in a parallel circuit are represented by i_1=5 sin(omega)t and i_2=10 sin((omega)t +60 degree). Find the resultant current.   Topic AC Circuit Fundamentals Single phase AC Circuits Three phase AC circuits AC Circuit Problems Two alternating currents in a parallel circuit are represented by i_1=5 sin(omega)t and i_2=10 sin((omega)t +60 deg). Find the resultant…

A 4-pole DC shunt motor takes 22 A from 220 V supply. The armature and field resistances are 0.5Ω and 100 Ω respectively. The armature is lap connected with 300 conductors. If the flux per pole is 20 mwb, calculate (i) Speed (ii) Torque Problem Question A 4-pole DC shunt motor takes 22 A from 220 V supply. The armature and field resistances are 0.5Ω and 100 Ω respectively. The armature is lap connected with 300 conductors. If the flux…

A 4-pole motor is fed at 440 V and takes an armature current of 50 A. The resistance of the armature circuit is 0.28 Ω. The armature winding is wave connected with 888 conductors and useful flux per pole is 0.023 wb. Calculate the back EMF and speed. Problem Question A 4-pole motor is fed at 440 V and takes an armature current of 50 A. The resistance of the armature circuit is 0.28 Ω. The armature winding is wave…

A 4-pole 230 V DC series wave connected armature with 1254 conductors with flux per pole of 22 mwb, takes 50 A for motoring. The armature and series field coil resistances are 0.3Ω and 0.2Ω respectively. Calculate the speed and torque developed. Problem Question A 4-pole 230 V DC series wave connected armature with 1254 conductors with flux per pole of 22 mwb, takes 50 A for motoring. The armature and series field coil resistances are 0.3Ω and 0.2Ω respectively.…

A 6-pole lap connected DC series motor with 864 conductors, takes a current of 110 A at 480 V. The armature resistance and field resistance are 0.18 Ω and 0.02 Ω respectively. The flux per pole is 50 mwb. Calculate (i) The speed (ii) The gross torque. Problem Question A 6-pole lap connected DC series motor with 864 conductors, takes a current of 110 A at 480 V. The armature resistance and field resistance are 0.18 Ω and 0.02 Ω…

A 220 V series motor is taking a current of 40 amperes. The resistance of armature is 0.5 Ω and resistance of series field is 0.25 Ω. Calculate (i) Voltage at the brushes (ii) Back emf (iii) Power wasted in armature (iv) Power wasted in field. Problem Question A 220 V series motor is taking a current of 40 amperes. The resistance of armature is 0.5 Ω and resistance of series field is 0.25 Ω. Calculate (i) Voltage at the…

A 200 V lap wound DC shunt motor has 800 conductors on its armature. The resistance of the armature winding is 0.5 Ω and that of field winding is 200 Ω. The motor takes a current of 21 A, the flux per pole is 30 mwb. Find the speed and torque developed in the motor. Problem Question A 200 V lap wound DC shunt motor has 800 conductors on its armature. The resistance of the armature winding is 0.5 Ω…

A 4-pole DC shunt motor takes 22 A from 220 V supply. The armature and field resistances are 0.5 Ω and 100 Ω respectively. The armature is lap connected with 300 conductors. If the flux per pole 20 mwb, Calculate the speed and gross torque. Problem Question A 4-pole DC shunt motor takes 22 A from 220 V supply. The armature and field resistances are 0.5 Ω and 100 Ω respectively. The armature is lap connected with 300 conductors. If…

A shunt generator delivers 50 KW at 250 V and runs at 400 rpm. The armature and field resistances are 0.02 Ω and 50 Ω respectively. Calculate the speed of the machine running as a shunt motor and taking 50 KW input at 250 V. Allow 1 V per brush for contact drop. Problem Question A shunt generator delivers 50 KW at 250 V and runs at 400 rpm. The armature and field resistances are 0.02 Ω and 50 Ω…

A shunt DC machine connected to 250 V supply, has an armature resistance of 0.02 Ω and the field resistance of 100 Ω. Find the ratio of the speed of the machine as a generator to the speed as a motor, the line current in each case being 80 A. Problem Question A shunt DC machine connected to 250 V supply, has an armature resistance of 0.02 Ω and the field resistance of 100 Ω. Find the ratio of the…

The field current in shunt DC machine is 2 A and the line current is 20 A at 200 V. Calculate the (i) Generated EMF when working as generator (ii) Torque in N-m when running at 1500 rpm as motor. Take the armature resistance as 0.5 Ω. Problem Question The field current in shunt DC machine is 2 A and the line current is 20 A at 200 V. Calculate the (i) Generated EMF when working as generator (ii) Torque…

A 4-pole 1500 rpm DC generator has lap wound armature having 24 slots with 10 conductors per slot. If the flux per pole is 0.04 wb, calculate the EMF generated in the armature. What would be the generated EMF if the winding is wave connected. Problem Question A 4-pole 1500 rpm DC generator has lap wound armature having 24 slots with 10 conductors per slot. If the flux per pole is 0.04 wb, calculate the EMF generated in the armature.…

An 8-pole lap connected armature has 40 slots with 12 conductors per slot, generate a voltage of 500 V. Determine the speed at which it is running if the flux per pole is 50 mwb. Problem Question An 8-pole lap connected armature has 40 slots with 12 conductors per slot, generate a voltage of 500 V. Determine the speed at which it is running if the flux per pole is 50 mwb. Topic DC Generators DC Generators Problems A shunt…

An 8-pole DC generator has 500 armature conductors, and useful flux per pole of 0.065 wb. What will be the EMF generated if it is lap connected and runs at 1000 rpm. At what speed it must be driven to produce the same EMF if it is wave connected. Problem Question An 8-pole DC generator has 500 armature conductors, and useful flux per pole of 0.065 wb. What will be the EMF generated if it is lap connected and runs…

A shunt generator running at 500 rpm delivers 50 KW at 200 V. The armature and field resistances are 0.02 Ω and 40 Ω respectively. Calculate generated EMF if brush drop of 1 V per brush. Problem Question A shunt generator running at 500 rpm delivers 50 KW at 200 V. The armature and field resistances are 0.02 Ω and 40 Ω respectively. Calculate generated EMF if brush drop of 1 V per brush. Topic DC Generators DC Generators Problems…

A shunt wound DC generator delivers 496 A at 440 V to load. The resistance of the shunt field coil is 110 Ω and that of armature winding is 0.02 Ω. Calculate the EMF induced in the coil armature. Problem Question A shunt wound DC generator delivers 496 A at 440 V to load. The resistance of the shunt field coil is 110 Ω and that of armature winding is 0.02 Ω. Calculate the EMF induced in the coil armature.…

A 4-pole generator with wave wound armature has 51 slots each having 24 conductors rotate to give an induced EMF of 220 V. What will be the voltage developed if the winding is lap and the armature rotates at the same speed? Problem Question A 4-pole generator with wave wound armature has 51 slots each having 24 conductors rotate to give an induced EMF of 220 V. What will be the voltage developed if the winding is lap and the…

A 4-pole lap wound DC shunt generator delivers 200 A at terminal voltage of 250 V. It has a field and armature resistance of 50 Ω and 0.05 Ω respectively. Neglecting brush drop, Determine (i) Armature current (ii) Current per parallel path (iii) EMF generated (iv) Power delivered. Problem Question A 4-pole lap wound DC shunt generator delivers 200 A at terminal voltage of 250 V. It has a field and armature resistance of 50 Ω and 0.05 Ω respectively.…

A 30 KW, 300 V DC shunt generator has a armature and field resistance of 0.05 Ω and 100 Ω respectively. Calculate the power delivered by the armature when it delivers full output power. Problem Question A 30 KW, 300 V DC shunt generator has a armature and field resistance of 0.05 Ω and 100 Ω respectively. Calculate the power delivered by the armature when it delivers full output power. Topic DC Generators DC Generators Problems A shunt generator has…

An 8-pole lap connected armature has 960 conductors a flux of 40 mwb per pole and speed of 400 rpm. Calculate the EMF generated if the armature were wave connected, at what speed must it be driven to generate 400 V. Problem Question An 8-pole lap connected armature has 960 conductors a flux of 40 mwb per pole and speed of 400 rpm. Calculate the EMF generated if the armature were wave connected, at what speed must it be driven…