What happens to a series connected direct current motor if its field winding opens at full load?
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A: Back emf = terminal voltage + drop in armature resistance. Power developed = back emf × armature…
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A: As per the guidelines of Bartley we supposed to answer first three subpart only.
Q: 1- Why should the D.C series motor not be operated at no load and light load?
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A: In this question we need to answer which device is generally used to disconnect the start windings…
Q: Why should the D.C series motor not be operated at no load and light load?
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Q: What will happen if we run the motor at nominal load without starting? Please observe and explain…
A:
Q: w can the direction of rotation of a DC unt motor be reversed?
A: DC shunt motor provides constant speed regardless of load.
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A: It is given that: V=230 VP=125 hpcosϕ=80 %=0.08
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A: The solution is given below
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A: Synchronous motor is constant speed motor always rotates at synchronous speed Ns =120fP
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Q: power factor and 220 volts.
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Q: 6. What Will Happen If The Direction Of Current At The Terminals Of A D.c Motor Is Reversed?
A:
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A: DC series motors are extensively used in hoists , cranes , traction purpose , etc.
Q: Why it - is not possible to start the d. series motor without load ? 6- Which is perferable ( d. c.…
A: DC motor is a electrical machine which is used to convert electrical energy to mechanical energy…
Q: 5 -Why it is not possible to start the d. C. series motor without load ?
A: As per Bartleby guidelines we are allowed to solve only one question,please ask the rest again. The…
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Q: Discussions 1- Why should the D.C series motor not be operated at no load and light load?
A: Bartleby has policy to solve only first question and if it has any subparts then solve only first 3…
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What happens to a series connected direct current motor if its field winding opens at full load?
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- 440 V, 50 Hz, 3-phase, wye-connected Induction Motor with the following particulars, R1= 0.075 ohm, X1=0.204 ohm, XM= 8.74 ohms, R2=0.063 ohm, X2=0.204 ohm NR @ full load=1560 rpm Find a. Stator current b. Pf of the stator c. Torque inducedThree Phase Induction Motor Question 1: A wound rotor induction motor runs with a slip of 0.05 when developing full load torque. Its rotor resistance is 0.45 0 per phase. If an external resistance of 0.50 per phase is connected across the slip rings, what is the slip for full torque?Q2 ) A 220-V, 1.5-hp 50-Hz,wo-pole, capacitor-start induction motor has the following main-winding impedances: R1=1.40 2 X1=2.01 S Xm= 105 2 R2 = 1.50 2 X2=2.01 S2 At a slip of 0.05, the motor's rotational losses are 291 W. The rotational losses may be assumed constant. . Find the following quantities for this motor at 0.05 slip: (b) Stator Power factor (e)Pout (f) Tele (a) Stator current (d) PAG (c) Input Power (g) TL (h) Pconv (i) Efficiency
- 4-What is the main function of a diverter used in series wound DC motor? 5- What is the main difference between (iron and friction losses) and copper (Cu) losses in DC generators? 054- A 3-phase A -connected 220-V (line-to-neutral), 60-Hz 6-pole induction motor has the following parameter values in O/phase referred to the stator: R1 = 0.294, R2 = 0.144, X, = 0.503, X2 = 0.209, Xm= 13.25. The total friction, windage, and core losses may be assumed to be constant at 403 W, independent of load. For a slip of 5%, a. Output torque b. Stator current, c. Power factor, d. Converted power e. Efficiency.A 220 V shunt motor driving its normal load draws an armature current of 50 A from a 220 V dc source. The armature resistance of this motor including brushes is 0.25 ohms. How much armature current (minimum) Will this motor draw from a 200 V DC source when driving the same load with the field adjusted to maintain the same speed.
- K-1)The speed of a 3-phase wound-rotor induction motor can be changed by varying the amount of resistance in the rotor circuit. a) true b) false K-2). Which of the following statements are true about a 3-phase synchronous motor? a) It is a constant speed motor even under varying loads. b) It runs at the same speed the magnetic field rotates on the stator. c) It can correct its own, and the supply line's power factor d) all of the above K-3. A) What determines the speed of a 3-phase synchronous motor? a) the number of poles b) the frequency of the supply c) both "a" and "b" d) neither "a" nor "b" K-3)B) From a technician's standpoint, which of the following is the most practical method of providing a wide range of speed control for a 3-phase synchronous motor? a) by changing the frequency b) by changing the number of poles c) both "a" and "b" d) neither "a" nor "b"A 480-V, 25-hp, 50-Hz, Six-pole, Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit: R₁ = 0.75 92, R₂ = 0.45 2, X₁=0.9 92, X₂ = 0.5 , XM = 20 92. The total rotational losses are 950 W and are assumed to be constant. The core loss is 100 W. For a rotor slip of 4 percent at the rated voltage and rated frequency, find the motor's (a) Rotor mechanical Speed in (rad/sec). (d) Pcony and Pout. (e) Tind and Tload. (b) Stator current. (c) Power factor. (f) Efficiency.what are the three major types of split phase motors?
- How rotor winding is derived the power in the three-phase induction motor? O a. from Single phase supply O b. from stator winding O c. None of the above O d. from slotsA 460-V (L-L), 25-hp, 60 Hz, four-pole, Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit: R1 = 0.6 ohms, X1 = 1 ohms, R2 = 0.3 ohms, X2 = 0.5 ohms, XM = 25 ohms. The total rotational losses are 1000 W and are assumed to be constant. Neglecting the core losses, for a rotor slip of 2 percent at the rated voltage and rated frequency. Find the motor's, (a) Stator current, (b) Power factor, leading or lagging? (c) Speed and Output Torque, (d) Efficiency, (e) The mechanical load of the motor changes and the new measurements show 35.7% increase in the current (I'=1.357xl) and 7.2% increase of the power factor (pf'=1.072xpf). For the new operating point find the motor's new speed (r/min).4- A 3-phase A -connected 220-V (line-to-neutral), 60-Hz 6-pole induction motor has the following parameter values in /phase referred to the stator: R1 =0.294, R2 0.144, X 0.503, X2 0.209, Xm= 13.25. The total friction, windage, and core losses may be assumed to be constant at 403 W, independent of load. For a slip of 5%, a. Output torque b. Stator current, c. Power factor, d. Converted power e. Efficiency.