A selector switch and two - wire pilot device cannot be used to control a large motor directly but rather must be connected to a magnetic starter. Why this is true.?

Q: - A four poles d.c Motor with a progressive simplex lap winding, 12 slots , Draw developed diagram…

A: Given DC motor has simplex lap winding structure with 4 poles and 12 slots  In this simplex winding…

Q: 1. When is the counter EMF at a minimum?

A:

Q: An 8-pole, 3.6 KW, 60 V, DC machine has a Duplex LAP-wound armature which has 72 coils with 10 turns…

A: Given  Power, P = 3.6Kw Voltage, V = 60V No. Of poles, P = 8 No. Of parallel paths, A = duplex*poles…

Q: a. it is the force exerted by the motor to perform a task b. it is a type of motor which is…

A: A motor is a device used for converting electrical to mechanical energy, they are three types of…

Q: Draw developed diagram for a progressive simplex lap winding d.c motor, 12 slot and 4-poles. Show:…

A: Step 1: Step 2: Step 3: Step 4:

Q: X1. The magnetic strength of the field poles on a permanent magnet DC motor cannot be varied. a)…

A: X1) True, because the magnetic strength of the field in permanent dc motor is fixed.   X2) The speed…

Q: 100 A. If the motor developing half the torque. Choose the correct answer. Tal armature resistance…

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Q: . a)Briefly explain ‘armature reaction’ and its effect with the help of a suitable diagram.…

A: Armature reaction is the effect that armature field is made in main field. Or we can say that it is…

Q: Question 16 A DC motor is shunt excited. It has rated voltage VT, rated output power PoUT and rated…

A:

Q: () What is the motor armature current? (a) 99 A (b) 102 A (c) 107 A (d) 110 A (e) 115 A (ii) What is…

A:

Q: What makes the Universal Motor armature rotates in the same continuous direction when (a) supplied…

A: Given: What makes the Universal Motor armature rotates in the same continuous direction when(a)…

Q: e) The motor is now connected differentially compounded. What is the motor's field current in (A)…

A: From the circuit diagram, IF=V(RF+RAdj)=240(75+175)=0.96 A From the table given in question,  EA…

Q: If the starter resistance is 1.9 ohms, what current does the motor take at the instant of starting…

A: At starting back emf is zero. So armature current at starting =( terminal voltage- brush voltage…

Q: 1- Why the counter emf cancels part of the armature voltage?

A: One individual question is to be answered. 1. The counter emf cancels part of the armature voltage…

Q: In short, answer the next question: How can determine whether the 3phase induction motor is working…

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Q: Please answer all subparts please answer in typing format

A: Step 1: Step 2: Step 3: Step 4:

Q: Explain with mathematical reasons why direct current motors cannot be operated from a constant…

A: The voltage of the dc motor is as follows:   V=I.R+Ldidt+E   =I.R+EE=ke.ωso, V=I.R+ke.ωke=Electrical…

Q: 4) Is the statement “An induction motor has the same physical stator as a synchronous machine, with…

A: Induction motor is single excited machine.synchronous motor is a doubly excited machine.Rotor of…

Q: Q4 A- Illustrator the rotor of the following Motors? 1- Control Differential (CD) Synchro motor. 2-…

A: Q4) A)

Q: 3. The armature of a 120 volts DC motor has resistance of 1.5 ohm and takes 4 ampere when operating…

A:

Q: How does the starting torque responsible in the use of the starter for the 3 phase induction motor

A: In the 3 phase induction motor, the value of the armature resistance is kept minimum to avoid the…

Q: Rotor slots are often skewed to help reduce A. starting current. B. rotor heat. C. starting torque.…

A: Given: Skewed rotors slots

Q: Overhauling is a condition in which the motor’s armature rotates                           (…

A: The explanation is as follows.

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.