550V dc series motor with an armature resistance of 0.35 W and and field resistance of 0.15 W drives a load at a speed of 750 rev min-1.  The supply current is 74A.  Calculate the load torque.The load torque is doubled and the supply current rises to 110A.  Calculate the new speed and power output

Q: DC series motor should strat with load. Select one: O True O False

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Q: A 250V series motor draws a current of 40A. The armature resistance is 0.15 ohm and the field…

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Q: A 400 V series motor has a field resistance of 0.02 ohm and an armature resistance of 0.1 ohm. The…

A: Given : A 400 V series motor field resistance = 0.02 ohm and an armature resistance = 0.1 ohm. The…

Q: A 440-V shunt motor has armature resistance of 0.9 Q and filed resistance of 1800. Determine the…

A: Given, A shunt motor has, Terminal voltage, V=440 V Armature resistance, Ra=0.9 Ω Field resistance,…

Q: 3. Calculate the torque develop of an induction motor supplying the following power and speeds: a. 5…

A: Given the power and speeds, Pm=T2πN60T=Pmx602πN

Q: OV DC series motor takes the line current of 30 A and runs at 750 rg d if torque is increased to 50…

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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: 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: (C)-Draw the mechanical characteristic of shunt and series DC motors. dienas SKINVER

A: Graph are provided,x and y axes are labelled with typical notations.

Q: By decreasing the stator voltage of induction motor to 80% of its rated voltage, the maximum torque…

A: Torque is directly proportional to the square of voltage. Let the reduced voltage be V'. Then , V'=…

Q: A three phase,22 kilowatt ,three- phase induction motor has a full load speed of 1440 r.p.m. If the…

A: The correct answer is OPTION D i.e 218.9Nm

Q: A 440-V shunt motor has armature resistance of 0.9 and filed resistance of 180 Q. Determine the back…

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Q: the forward torque will be equal to the backward torque at slip of two one none of the mentioned O…

A: In this question,  Choose the correct options What is slip if forward torque and backward torque are…

Q: The conductivity of a material is essentially expressed by the product of the number of free…

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Q: If a 3-ph induction motor has the following data: The speed at zero value of induced torque is…

A: Explanation: slip = 5% = 0.05 Sinchonous sped Ns = 3000/π rpm Full load torque Tfl = 170 Nm

Q: A 280 V shunt motor has an armature resistance of 0.3 Q and field resistance of 115 Q. At no load,…

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Q: If the losses of the armature wingdings of dc motor which is running at 1200 RPM is neglected and…

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Q: A 220 V, four-pole, 40 Hz, A-connected three-phase induction motor has a slip of 3 percent. This…

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Q: 9) If the series motor loss its load suddenly, then A. its torque goes too high B. its speed…

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Q: A 220V shunt motor develops a torque of 135N.m at an armature current of 25A. The torque developed…

A: torque in shunt machine is directly proportional to product of flux and armature current. we will…

Q: 440 V, 50 Hz, 3-phase, wye-connected Induction Motor with the following particulars, R1= 0.075 ohm,…

A: V =400 V f=50 hz Nr=1560 rpm Vph =4003=231 V Note: number of poles are not given, we assume P= 2…

Q: The dc motor has maximum current at start because:

A: In DC Motor, rotating armature in the magnetic field develops an EMF which always acts against the…

Q: In a d.c. series motor, the torque developed is 20 Nm at 10 A. If the load current is doubled, the…

A: Given a dc series motor with, Torque developed, τ1=20 Nm. At the current, I1=10 A. When the current…

Q: series motor runs at 800rpm when the voltage is 400v and the current is 25 ampere the armature…

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Q: 500 V shunt motor has an armature resistance of 0.3 Q and field resistance Of 250 Q. Determine the…

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Q: 41. If the current in the armature of d.c series motor is reduced to 50%, the torque of the motor…

A: Given: For a dc series motor, Case 1: Armature current, Ia1=Ia Torque, T1=T Case 2: Armature…

Q: A 110 V shunt motor has a field resistance of 55 ohms and armature resistance of 0.1 ohm. The motor…

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Q: 240V dc shunt motor has an output of 15.25Hp and runs at 1500 rpm. What will be the torque in…

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Q: A 250 V DC series motor takes 40 A and runs at 1000 RPM. Find the speed at which it runs if its…

A: The back emf of the given DC series motor is,  Eb1=V-Ia1Rf+RaV=250 VoltsRf=0.25 ΩRa=0.25 ΩIa1=40…

Q: An 8-pole, 460 V shunt motor has 600 lap-wound conductor. It takes 45 A from the supply mains and…

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Q: A 220 V shunt motor has an armature resistance of 0.4 ohm and field resistance of 140 ohm. The motor…

A: We have an shunt motor which is having, Voltage (V) = 220 V Armature resistance (Ra) = 0.4 Ω Field…

Q: A 240 V ,6.28KW, star connected Induction motor with speed of 100 rps.Calculate the shaft torque

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Q: Starting torque of induction motor is less than that of a. DC shunt motor b. AC series motor c. DC…

A: Dc series motor has highest starting torque compare to all motors.  Therefore starting torque of…

Q: series motor is

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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: 22 A 400 V, 60 Hz, Induction motor has a starting torque of 125 % and a pull-out torque of 375 %…

A: Given a 400 V, 60 Hz, induction motor has, Rated torque = τ. Starting torque, τst=125 % of τ=1.25τ.…

Q: A dc series motor has an armature resistance of 0.06 Q and series field resistance of 0.08 Q. The…

A: As two questions are different so iam solving only one question i.e 1st question. take ratio of back…

Q: 3.6 The starting current of a 3-0 induction motor is 5 times the rated current, while the rated slip…

A: we need to determine ratio of starting torque to full load torque.

Q: ) Describe a single wire DC motor with the help of a diagram.

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Q: Which of the characteristics, given in the figure, is of a series DC motor?*

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Q: An increase in the torque angle a results in: O A. No change in the induced torque O B. Decreasing…

A: The solution is given below is

Q: Q18 / Draw The torque-speed characteristic of a series DC motor.

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Q: A 400 V series motor has a field resistance of 0.02 ohm and an armature resistance of 0.1 ohm. The…

A: It is given that: IL1=Ia1=30 AN1=1000 rpmRse=0.02 ΩRa=0.1 ΩVt=400 VRsh=0.03 ΩT2=0.6T1

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.