(a) Explain briefly what is fringing effect and leakage flux.

Q: Q1: a) why is the resistance of small machines high, and the resistance of large machines low? why…

A: Why the resistance of small machines high and the resistance of large machines low ? The reason…

Q: Explain very briefly about the flux fringing and their place of occurrences.

A: Whenever the flux is developed within the air gap of the magnetic circuit, then this phenomenon is…

Q: Discuss the following terms               (i) Double Revolving Theory               (ii) Lap…

A: As per our policy i have attempted first three sub-parts. (i) The double-revolving field theory of a…

Q: a) Estimate the stator core loss. Assume the maximum lamination flux density is 1.65 T.

A:

Q: The core loss is the combined hysteresis and eddy current losses in the armature and field iron True…

A: There are two type of losses present in the machine copper loss core loss

Q: What will be the front and back pitches of the 6-pole dc generator with a simplex 2-layer wave…

A:

Q: For a P pole machine derive the flux per pole.

A: Average EMF generated by the armature of a DC generator (voltage across the brushes of different…

Q: Armature windings in ac generators are same as those used in DC machines Select one: True False

A: The given Statment is true or false.      Armature windings in ac generators are same as those used…

Q: briefly describe the phenomenon of magnetic hysteresis.

A: Firstly I will define magnetic hysteresis. Then I will explain the hysteresis curve. Then I will…

Q: Explain the following Armature Winding Terminologies (i) Coil Span (ii) Resultant Pitch

A: In the following section, coil span and resultant pitch related to armature winding technology has…

Q: Problem 1. An(8-pole, wave-connected armature has 600 conductors and is driven at 625 rev/min. If…

A:

Q: For a conventional salient-pole Synchronous Machine obtain the voltage equations for each winding in…

A:

Q: Q\ Compare between Variable reluctance (VR) type and permanent magnet (PM) type and Hybrid type

A: permanent magnet motor is used to magnet imbedded into a surface of the motor rotor. it is used in a…

Q: An 8-pole, wave-connected armature has 600 conductors and is driven at 625 rev/min. If the flux per…

A: The solution can be achieved as follows.

Q: construct an winding diagram with -4 poles -26 conductors -double layer -simplex wave winding, 2…

A:

Q: Explain the following armature winding terminologies (i)commutator Pitch (ii)Coil Side (iii)Pole…

A: The given armature winding terminologies: (i)commutator Pitch (ii)Coil Side (iii)Pole Pitch

Q: For P pole machine relation between electrical degrees and mechanical degrees is *

A: For a p pole machine θmech is  given by, θmech=P2 θelc

Q: 3- Why the magnetization curve of SG is similar to the B-H curve of armature steel core?

A: The electrical machines can be either generator or motor. They are used for the energy conversion…

Q: (a) For a P pole machine, derive the total flux per pole.

A:

Q: For a 4-pole armature winding, the span between phases is equal to 90°. Select one: O True O False

A: The correct answer is FALSE

Q: Why the magnetic and copper losses calculated by swinburn test method are less than the actual…

A: The magnetic and copper losses calculated by the swinburn test method are less than the actual…

Q: ( Write the types and shortly explain the magnetic losses for electrical machines. )

A: In this question we discuss about type of magnetic losses for electrical machines

Q: Electric Machines2 What are the characteristics of the rotating magnetic field created by…

A: The rotating magnetic field created by the three-phase current in three-phase stator winding: When a…

Q: The example of electric ciruit of machine parts is a. Armature core b. Field poles c. commutator d.…

A: The yoke is external structure for machine. The function of Pole is to hold the field Windings.…

Q: 9. For a 4-pole, 2-layer, dc lap-winding with 20 slots and one conductor per layer. What is number…

A:

Q: DEGREE: ELECTRICAL ENGINEERING  SUBJECT/COURSE: AC MACHINES   Answer the following questions (A,…

A: Alternator- Alternator is a form of machine which is used to convert mechanical energy into…

Q: An 8-pole, wave-connected armature has 600 conductors and is driven at Problem 1. 625 rev/min. If…

A:

Q: Armature is lap connected with 144 conductors.Field resistance is 45 ohms. Determine: a.) Build up…

A: A shunt generator is a type of DC electrical generator during which the sphere and coil windings…

Q: which is the best method for reducing armature reaction O a. Using High reluctance pole time O b.…

A: In this question,  Choose the correct option Which is the best method for reducing armature…

Q: Write the types and shortly explain the magnetic losses for electrical machines

A: we need to explain the types and shortly explain the magnetic losses for electrical machines

Q: With the aid of diagrams explain the three generator characteristic curves

A: A d.c. generator is an electrical machine where conversion of mechanical energy to electrical energy…

Q: ii. Differentiate the two types of armature windings in DC machines: lap winding and wave winding.

A:

Q: (b) In a DC machine, the total armature conductor is 1000 and the number of slots 40, then the…

A: Conductor per slot=total no.of conductorsno.of slots. Efficiency =output poweroutput power+iron loss…

Q: The core loss is the combined hysteresis and eddy current losses in the armature and field iron True…

A: In a transformer losses are of 4 types Core losses Copper losses Stray losses  Dielectric losses

Q: Derive an expression for the rotor copper loss in terms of slip and input to the rotor?

A: The explanation is as follows.

Q: Explain the installation procedures of a flexible coupling

A: Flexible coupling is used to transfer torque from one shaft to another that is not fully aligned.…

Q: How are eddy current losses affected by the frequency and density of the flux wave?

A:

Q: Ex1 : An 8 pole armature is wound with 420 conductors , the flux and the speed are each that the…

A: The armature lap-connected number of the parallel path in the armature winding=number of poles=8 No.…

Q: Determine the flux per pole for 6 pole de machine having 240 wave connected conductors, which…

A:

Q: 13- In field divertor method of speed control,by adjusting its resistance leads to a. increase in…

A: In field divertor method of speed control,by adjusting its resistance leads to

Q: An 8-pole lap connected armature has 960 conductors, a flux of 40 mWb per pole and a speed of 400…

A: Given values are - PolesP=8Number of conductorsZ=960Fluxϕ=40mWbSpeedN=400   Given that armature is…

Q: Mention three (3) reasons for arcing at the commutator. 2.

A: Carbon brushes at the commutator are the main cause of arcing or sparking. The reasons for arcing at…

Q: Determine the flux per pole for 6 pole dc machine having 240 wave connected conductors, which…

A: Given, a DC machine having Wave wound, so Number of parallel path, A= 2 Number of poles, P= 6 Number…

Q: Indicate whether the following statement are true or false * True False The type of dc generator…

A: The explanation is as follows.

Q: 4 poles -26 conductors -double layer -simplex wave winding Can you do this in "armature…

A: 4 poles26 conductors-double layer-simplex wave winding

Q: 2. Design and draw a developed diagram/layout of a simple 2-layer Wave-winding for a 4-pole de…

A: DC generator- DC generator is a machine which convert mechanical energy into electrical energy of DC…

Fault Analysis

In an electrical engineering system, a fault is an abnormal electric current flowing through the system, and fault analysis is the study of these faults. For instance, a short-circuit is a fault where the live wire touches the ground or neutral wire. If a circuit is interrupted by a failure of a current-carrying wire then an open circuit fault occurs. The open-circuit faults are also called series faults. One or more phases or ground may be involved in a three-phase fault or may occur only between two phases. Current flows into the earth in case of a ground fault or earth fault. For most situations, the prospective short circuit current of a fault that is predictable can be calculated. To limit the loss of service because of a failure, the protective devices can detect fault conditions and operate circuit breakers and also other devices. All phases equally can be affected in a poly-phase system which is known as symmetric electrical fault. The asymmetric fault becomes more complicated to analyze if only some phases are affected. By using methods such as symmetrical components, the power system analysis of these types of faults is often simplified. The main objective of power system protection is to design, detect, and interrupt power system faults.