A 10 kW, 250 V, dc shunt motor with an armature resistance of 0.8 Ω and a field resistance of 275 Ω takes 3.91A, when running light at rated voltage and rated speed. What conclusions can you draw from the above data regarding machine losses? Calculate the machine efficiency as a generator when delivering an output of 10 kW at rated voltage and speed and as a motor drawing an input of 10 kW. What assumption if any do you have to make in this computation?

Q: A shunt motor on a 240- V line has an armature current of 75 A. If the field- circuit resistance is…

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Q: 90%. Select one: a. Not on the list b. 100 N-m c. 120 N-m d. 178 N-m

A: Given data: Output Power= 25hp (18.65kW) Speed, N= 1000 r/min

Q: A long compound DC generator feeding a load of current 100 A, at a voltage of 230 V. Calculate the…

A: Given: Current, IL=100A, Resistance, Ra=0.04ΩRsh=115ΩRse=0.01Ω Voltage, V=230V

Q: DC series motor

A: For the DC series motor, Ise=Ia =Ia   Flux, conductor, poles, armature resistance values given in…

Q: An induction motor has a full load slip of 0.04. It's starting current 5 times its full load…

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Q: A series motor runs at 700 rev/min when the voltage is 300 V and the current is 20 A. The armature…

A: Initial speed of motor N1=700 rpm. Initial terminal voltage V1=300 V. Armature current Ia=20 A.…

Q: 2. A 25 kW shunt machine having an Armature circuit Resistance of 0.4 2 and a filed resistance of…

A: In this dc machine is given..We have to find out efficiency when machine acts as generator and…

Q: A DC series motor rotates at 1200 rpm and draws 40 A at 240 V. The armature and field resistances…

A: The speed of the motor, The current drawn by the motor,The terminal voltage,The  iron and friction…

Q: A Series motor drives a load at 1700 rpm and takes a current of 25 A when the supply voltage is…

A: According to the question we need to solve only the first question. Given, speed = 1700 rpm  the…

Q: A 140 V, DC separately excited motor drives a constant-torque load at 1000 rpm speed. The armature…

A: hi there, as per the guidelines, we answer first 3 sub parts of a query, please post Q4 as a…

Q: A dc motor has an electrical power of 150W, speed of w=30rad/s, and a torque of 3N-m. The efficiency…

A: given Input power= 150W w=30 rad/sec torque,τ=3 N-m

Q: A 220 V shunt motor has armature and field resistances of 0.5 Q and 220 Q respectively. Initially,…

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Q: The field and armature resistances of a 220-V series dc motor are 0.2 ohms and 0.1 ohms…

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Q: A 220 V permanent magnets DC motor has an armature resistance of 0.502. If the full load armature…

A: Given data, Terminal voltage V = 220 V. Armature resistance Ra=0.5 Ω. Armature current Ia=20 A.

Q: Q2/ The open circuit voltage of a separately excited de generator when running at a constant speed…

A: Initial speed of the generator (N1) = 2000 r.p.m The generated e.m.f, Eg1 = 122 V Load voltage (V) =…

Q: A 200 V dc motor takes 50 A in series and is operating at a speed of 1000 rpm when full of…

A: Given, A dc motor with, Terminal voltage, V=200 V. Armature current, Ia=50 A. Operating speed,…

Q: Ashunt-wound DC motor with the feld coils and rotor connected in parallel (Figure 1) operates from a…

A: From the DC shunt motor equivalent circuit

Q: A DC motor rotating at 1800 RPM with 180 Volts and 48 Amp line current. The copper losses were…

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Q: Question 2) A series DC motor of 250 V. 10 HP has field resistance equal to 0.1 ohms and armature…

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Q: A self-excited. DC shunt generator is rated at 22 kW, 220 V at 1800 rpm. The following data are…

A: We are authorized to answer three subparts at a time. Since you have not mentioned which part you…

Q: A dc generator has a prime mover that provides a speed of 1568 rpm at a torque of 22.6 N-m. With…

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Q: A DC motor has the following specifications: 10 hp, 37.5 A, 230 V; flux / pole = 0.01 Wb, number of…

A: back  emf Eb = flux per pole×speed of the machine×total number of conductors60×number of polesnumber…

Q: ad current corresnond Q2// A D.C series motor takes 40 A at 220 V and runs at 800 r.p.m, the…

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Q: A 415V squirrel cage induction motor develops a torque of 40Nm. The torque developed by the motor if…

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Q: A 20 kW shunt machine having an Armature circuit Resistance of 0.5 N and a filed resistance of 1200,…

A: Draw the circuit diagram for the DC shunt generator.

Q: A 10 kW, 250 V shunt motor has an armature resistance of 0.5 Ω and a field resistance of 200 Ω. At…

A: Back emf  of motor=terminal voltage- voltage drop in armature resistance . Back emf of dc motor is…

Q: 1.9 A series motor has an armature resistance of 0.2 ohm and a series field resistance of 0.3 ohm.…

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Q: 1. A 200V de shunt generator can deliver 10 kW at half load with efficiency of 83 %. If the armature…

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Q: Q2// long shunt compound generator gives 240 V at F.L output of 100 A Ra=0.12, series field…

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Q: 1.4 A dc series motor draws 300 A from a 750 V supply when deliveri at 950 r/min. The field and…

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Q: A long compound DC generator feeding a load of current 100 A, at a voltage of 230 V. Calculate the…

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Q: 4. The field windings of a series motor has a resistance of 120 ohms at 15°C. After running for two…

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Q: A d.c. shunt motor after running for several hours on constant voltage mains at 400 V takes a field…

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Q: 2. A 15 kW shunt machine having an Armature circuit Resistance of 0.35 and a filed resistance of…

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Q: A 4 pole, 300 V Series Wound  DC Motor developing 25 HP and 81.57 N-m torque runs at a speed of 750…

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Q: A 220 V permanent magnets DC motor has an armature resistance of 0.5 0. If the full load armature…

A: Given data, Terminal voltage V = 220 V. Armature resistance Ra=0.5 Ω. Full load armature current…

Q: 3. Which of the following statements IS NOT CORRECT ? * for two motors with equal output power,…

A: Motor: It is an electromechanical device. this takes the electrical input and converts this power…

Q: The output power of a shunt motor is 7.8 hp. Its armature draws 50 A from 120 V. The armature and…

A: Given: Pout=7.8 HPIL=50AVt=120VRa=0.1ΩRf=100Ω Shaft power will be: Pout=7.8×746Pout=5818.8 W

Q: A D.C. series motor of resistance 1 ohm between terminals runs at 800 r.p.m. at 200 V with a current…

A: In the case of the DC series motor Ea=V - Ia(Ra+Rse) where V=Terminal Voltage=200 V; Ea=Armature…

Q: A DC motor has the following specifications: 10 hp, 37.5 A, 230 V; flux / pole = 0.01 Wb, number of…

A: Given-   DC motor -10 hp,37.5 A, 230 V,Flux/pole = 0.01 Wb,Number of poles P = 4,Number of…

Q: A DC motor with a shunt field winding has the following characteristics: Vr = 96.0 V R, = 1.50 2 K=…

A: Given: A DC motor with shunt field winding have VT=96 VRA=1.50 ΩK=0.352 mT=18 Nm

DC Generator

An electromechanical machine which converts input mechanical energy to respective output electric energy is called a generator.