The direction of rotation of Series DC motor can be reversed by interchanging terminal(s). 1) Field 2) either armature or field 3) armature 4) both armature and Field at the same time
Q: 8. A shunt motor is running at 1200 rpm for a load which requires an armature current of 50 Amp from…
A: Given Speed N=1200 rpm Armature current Ia=50 A Terminal voltage V=230 V No-load armature current…
Q: rated load, a shunt motor draws an armature current of 50A from a 230V dc mains while running at…
A: Please refer the attached images for the complete answer..
Q: Field winding resistance of DC shunt motor compared to its armature resistance is Equal Samller…
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Q: a) Why do we use asynchronous word for asynchronous (induction) motors? b) How are the three-phase…
A: As per our guidelines we are supposed to answer only one question. Kindly repost other questions as…
Q: 2)List the methods of speed control of three phase induction motor from both stator and rotor sides?
A: Since you posted the multiple question so I solve 2nd questions for you List of speed control from…
Q: 1-D.C. shunt motor maintains a more constant speed under varying load. (True or False) 2-Dc shunt…
A: 1-D.C. shunt motor maintains a more constant speed under varying load. 2-Dc shunt motor is best…
Q: Explain briefly in maximum of two(2) sentences why the series wound DC motor type has a higher…
A: Incase of DC series motors armature and field winding is connected in series. The entire current is…
Q: A synchronous motor is running at 75 percent of rated load with unity power factor. If the load…
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Q: a Compare synchronous and induction motor in terms of: cost, starting methods, speed and torque. b…
A: a)
Q: a) Why do we use asynchronous word for asynchronous (induction) motors?
A: As per the honour code I will only attempt Q1. Kindly repost the other questions again. THANK YOU!!…
Q: 6. A 75-HP, three-phase, six-pole, 60-Hz, Y-connected, cylindrical-rotor synchronous motor has…
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Q: 1-The main disadvantage of Rheostatic control method of a dc shunt motor, that the speed up to zero…
A: In this question , some statements are given related to dc machines , we have to find out that they…
Q: "Explain why speed of a DC motor get affected on load, if its series field winding is connected…
A: DC motor emf equation is given as, E=NPϕZ60AN=EA60PϕZk=PZ60ASo, N=EKϕ The torque equation of the DC…
Q: The field winding resistance of DC shunt motor compared to its armature resistance is O Very high O…
A: DC Motor: DC Motor is an electromechanical device which converts electrical energy to mechanical…
Q: what
A: For the above given question we need to list advantages of gear motors.
Q: Determine the back emf and the torque developed for a 4-pole motor with 4 armature paths, 4800…
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Q: If the voltage applied across the armature of a DC shunt motor is increased by 5% keeping its load…
A: generated emf in armature E = flux ×speed×no. of conductors60 ×no. of polesno. of parallel paths…
Q: 1.) A certain 5.5 kW, 125-V DC long shunt compound generator was operated as a shunt generator motor…
A: Given: Armature resistance, Ra=0.2 ΩSeries field resistance, Rse=.25 ΩShunt field resistance, Rsh=25…
Q: mpare Permanent Magnet DC motor, Series DC Motor, Shunt DC Motor, and Compound DC Motor by: Speed…
A: 1) The speed regulation of the motor is basically the speed of the motor when the motor is at no…
Q: Q6/. The armature torque of a dc motor is a function of its a. Field flux alone • b. Armature…
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Q: The characteristic (Speed versus armature current) of a dc shunt motor is known as the electrical…
A: The electrical characteristics are,
Q: 1- The characteristic (angular speed versus T) of a dc shunt motor is known as the External…
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Q: The field winding resistance of DC shunt motor compared to its armature resistance is Very high…
A: In this answer we will try to find about different windings in the DC machine as shown below and…
Q: 5. In a DC shunt motor, speed is related to armature current as _____________ a) Directly…
A: 5.) As the armature current increases there is a decrease in speed. Hence the armature current and…
Q: Q.2 a) Why do we use asynchronous word for asynchronous (induction) motors? b) How are the…
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Q: Field winding resistance of DC shunt motor compared to its armature resistance is O Equal Samller…
A: In a DC Shunt motor, there are two windings, 1. Armature winding(it has armature resistance) 2.…
Q: Derive an expression for armature torque of a dc motor in terms of back emf, armature current and…
A: we need to derive an expression for armature torque.
Q: 2. In a DC shunt motor, what will be the armature current at maximum load?
A: In the DC shunt motor, the armature current is given by, Ia=IL-If Where Ia is armature current, If…
Q: The characteristic (Speed versus armature current) of a dc shunt motor is known as the electrical…
A: Electrical characteristics are the drawn between armature current on X axis and speed on Y axis.
Q: نقطة واحدة Indicate whether the following * statement are true or false False True The…
A: Consider the list for the characteristic curve is shown below. (i) Torque vs armature current…
Q: Speed current characteristic of cumulative DC compound motor at larger values of armature current is…
A: The Emf generated in DC machine is proportional to the product of flux and speed of the machine. The…
Q: How high is the rated torque of separately excited shunt wound DC Motor?
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Q: 14) the difference between internal generated voltage and output voltage in synchronous generator…
A: As per guidelines given to us,we can only provide the solution of first question in multiple type of…
Q: Give a comparison among speed control methods of 3-0 induction motor.
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Q: Illustrate and compare speed current and torque current characteristics of a compound wound d.c.…
A: we need to compare speed current and torque current characteristics of a compound would dc motor,…
Q: 1. A 200 V shunt motor has armature and shunt field resistances of 0.15 Q and 1250, respectively.…
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Q: Draw and explain the equivalent circuit of a single-phase induction motor based on double field…
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Q: 6. The major failure area of a typical wound-field and wound-armature DC motor is A. brush wear and…
A: In DC machine, major problems are due to brushes.
Q: A shunt DC generator has no load terminal voltage of 140V. Armature resistance is 1ohm and shunt…
A: Given data, A DC shunt generator has No load terminal voltage, V=140 V Armature resistance, Ra=1 Ω…
Q: A synchronous motor with negligible armature resistance operates at a nominal frequency of 25…
A: Given: At Nominal Frequency F , Load angle =25 degree At increased frequency of 15 % of F , then…
Q: > The armature winding is the main current-carrying winding in which the electromotive force or…
A: The armature winding is the main current carrying winding in which the electromotive force or…
Q: series motor, the armature torque is directly proportional to the armature current" True False
A: In dc series motor since the field winding is also connected in series with armature the flux is…
Q: O Explain the reason how AC Commutator motor is operated with DC or single phase AC. e Explain how…
A: Commutator is feature of DC motor. However, AC motor with wound rotor with brushes and commutator…
Q: For a shunt DC motor, if the field circuit is open, what will happen? Why? A series DC motor gives…
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Q: 1-transfer function of DC Series motor 2-block diagram of DC Series motors.
A: DC series motor : DC series motor is a set of self-excited DC vehicles wherein the sphere coil is…
Q: a) If the torque pulled from the shaft is doubled while the asynchronous motor is working in the…
A: As per our policy, i have to attain only one question. Solution a)- In the asynchronous motor's…
Q: The armature of a 8 pole d.c. shunt motor has a lap connected armature winding with 1000 conductors…
A: Consider the given values, The No load flux is given as, ϕNL=10 mWb. Due to armature reaction, the…
Q: Prove that mechanical power developed by a self excited DC shunt motor is maximum when back EMF is…
A: we need to find prove Eb=V2, for maximum power.
Q: Report 1- Sketch speed (y-axis) torque (x-axis) characteristics of compound DC motor for three…
A: Hello. Since you have posted multiple questions and not specified which question needs to be solved,…
Q: 28/ How can the speed of a shunt dc motor be ontrolled? Explain in detail.
A:
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- the magnetic strengh of the field poles on a perment magnet DC motor cannot be varied a- true b- false4- A double squirrel-cage induction motor has (a) Two series winding in stator (b) Two parallel windings in stator (c) Two parallel winding in rotor (d) Two rotors moving in opposite direction 5 The rotor slots are slightly skewed in squirrel cage induction motor to ---------- (a) Increase the strength of rotor bars (b) Reduce the magnetic hum and locking tendency of rotor (d) Provide ease of fabrication (c) Economize on the copper to be used 6- Stable operation of an induction motor is (a) Between zero slip and unity slip (b) Between zero slip and slip corresponding to maximum torque (e) Between 6.5 slip and 0.95 slip (d) Between slip corresponding to maximum torque and unity slip 7- Iron loss in the rotor of a 3-phase induction motor is negligible due to (a) Very low frequency of emf induced in the rotor (c) Very low flux density in rotor parts (b) Very low emf induced in the rotor (d) Constant magnitude of flux linking the rotor core7 A 4-pole dc generator is running at 1500 rpm. The frequency of current in the armature winding is (a) 50 Hz (b) 150 Hz (c) 25 Hz (d) 100 Hz [ESE-2012]
- What are the factors that the induced voltage in three phase induction motor depends upon and Explain how the rotating magnetic field is produced in the three phase induction motor. ii) When the speed difference will be maximum in three phase induction motor. Justify your answerA Switched reluctance motor has a phase sequence of A-B-C while rotating clockwise. Phase sequence while rotating anti clockwise is .. O C-A-B O B-C-A O A-B-C O A-C-BQ2] Fill in the blank (9 Marks) 1-The current drwan by the armature of D.C. motor is directly proportional to 2- The speed of a D.C. shunt-wound motor will shunt field regulator is increased. 3- The synchronous speed of a three-phase induction motor is number of pairs of poles. Rotor copper losses Rotor input power in induction motor = 5- A 4-pole three-phase induction motor has a synchronous speed of 25 r.p.s. The frequency of the supply to the stator is_ Hz. 6- The power input to a mains transformer is 200VA. If the primary current is 2.5A, the secondary voltage is 2V and assuming no losses in the transformer, the turns ratio step down. is 7- A 200kVA transformer has an iron loss of 1 kW and full load cu loss of 2 kW. Its load kVA corresponding to maximum efficiency is kVA. 8- If cu loss of a transformer at 7/8th full load is 4900 W, then its full-load cu loss would be watt. 4- if the value of resistance of the proportional to the 9- The slight curvature at the lower end of the open…
- Skewing of rotor conductors in a squirrel cage induction motor reduces a. heat developed while rotating b. friction while rotating c. humming noise while rotating d. Vibrations while rotatingSkewing of rotor conductors in a squirrel cage induction motor reduces a. heat developed while rotating b. Vibrations while rotating c. friction while rotating d. humming noise while rotatingA triplex lap wound armature has 300 turns and takes 125 A of armature current. The flux per pole is 20 mWb and the 2-pole series DC motor has a rated speed of 480 rpm with rotational losses of 700 W. Solve for back emf (V)
- why the slip of induction motor is never zero.In series motor, the armature torque is directly proportional to the armature current" True False26. A 4-pole, 50 Hz induction motor operates at 5% slip. The frequency of e.m.f. induced in the rotor will be .... (1) 25 Hz (iii) 2.5 Hz (ii) 50 Hz (iv) none of the above