what are the losses in DC machine?

Description : The magnetic neutral plane shifts in a dc machine (A) in the direction of motion of motor (B) in the direction of motion of generator (C) due to increase in the field flux (D) cause reduction of flash over between commutator segments

Last Answer : The magnetic neutral plane shifts in a dc machine in the direction of motion of generator

In a D.C. generator, the iron losses mainly take place in?

Last Answer : In a D.C. generator, the iron losses mainly take place in armature rotor.

The total losses in a well designed D.C. generator of 10 kW will be nearly?

Last Answer : The total losses in a well designed D.C. generator of 10 kW will be nearly 500 W.

Explain concept of back emf in DC machine. State how it governs armature current.

Description : Explain concept of back emf in DC machine. State how it governs armature current.

Last Answer : Back emf: When the armature of DC machine rotates under the influence of driving torque, the armature conductors move in the magnetic field and cut it and hence emf is induced in them. The ... flow of armature current i.e. it automatically changes the armature current to meet load requirements.

A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2

Description : A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Last Answer : A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is 0.87

A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and

Description : A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and front pitch adopted could be respectively

Last Answer : A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and front pitch adopted could be respectively 19,17

The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors

Description : The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is (1) 1000V (2) 100V (3) 600V (4) 10,000V

Last Answer : The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is 1000V

Aluminium is not used as winding wire for the armature of a dc machine because

Description : Aluminium is not used as winding wire for the armature of a dc machine because (1) aluminium has low resistivity (2) a large winding space is taken by aluminium conductors and creates ... ) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper

Last Answer : Aluminium is not used as winding wire for the armature of a dc machine because (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper

In a dc machine, interpoles are used to

Description : In a dc machine, interpoles are used to (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction

Last Answer : In a dc machine, interpoles are used to neutralize the effect of armature reaction in the interpolar region

Brushes of DC machine are made up of ?

Description : Brushes of DC machine are made up of ?

Last Answer : Brushes of DC machine are made up of carbon.

In a D.C. machine stray loss is the sum of?

Last Answer : In a D.C. machine stray loss is the sum of iron loss and mechanical loss.

To avoid formation of grooves in the commutator of a D.C. machine?

Last Answer : To avoid formation of grooves in the commutator of a D.C. machine the brushes of opposite polarity should track each other.

Open circuited armature coil of a D.C. machine is?

Last Answer : Open circuited armature coil of a D.C. machine is identified by the scarring of the commutator segment to which open circuited coil is connected and indicated by a spark completely around the commutator.

In case of D.C. machine winding, number of commutator segments is equal to?

Last Answer : In case of D.C. machine winding, number of commutator segments is equal to number of armature coils.

In a four-pole D.C. machine?

Last Answer : In a four-pole D.C. machine alternate poles are north and south.

The friction losses in Real Transformers are :

Description : The friction losses in Real Transformers are : (A) 0% (B) 5% (C) 25% (D) 50%

Last Answer : A

Which of the following can reduce the Eddy current losses?

Description : Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage D) None of these

Last Answer : Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage D) None of these

State the losses in secondary distribution system.

Description : State the losses in secondary distribution system.

Last Answer : The losses in secondary distribution system: a) Technical losses: 1. Due to poor voltage 2. Due to unbalance load 3. Due poor quality of transformer & its components 4. Due to poor quality ... of induction type of energy meter. 3. Lack of administration. 4. Energy theft 5. Unmetered supply

Explain the “mitigation of power theft” and “faulty meter replacement” for energy conservation techniques to reduce commercial losses.

Description : Explain the “mitigation of power theft” and “faulty meter replacement” for energy conservation techniques to reduce commercial losses.

Last Answer : Energy conservation techniques to reduce commercial losses: 1. Mitigation of Power Theft: Power theft being the most important issue which all of the service providing utilities ... agricultural sector. Prepaid meters may prove effective measures against unauthorized abstraction of energy.

Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Description : Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Last Answer : (i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.

In case of D.C. machines, mechanical losses are primary function of?

Last Answer : In case of D.C. machines, mechanical losses are primary function of speed.

Reduction in core losses and increase in permeability are obtained with transformer employing?

Description : Reduction in core losses and increase in permeability are obtained with transformer employing?

Last Answer : Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.

Losses which occur in rotating electric machines and do not occur in transformers are?

Description : Losses which occur in rotating electric machines and do not occur in transformers are?

Last Answer : Friction losses windage losses

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

Description : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

Last Answer : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?

Description : Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?

Last Answer : Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is approximately equal to 1.

In a synchronous motor which losses varies with load?

Description : In a synchronous motor which losses varies with load?

Last Answer : In a synchronous motor, copper losses varies with load.

What are the types of power losses in inductor?

Description : What are the types of power losses in inductor?

Last Answer : Copper losses, Eddy current loss, and hysteresis loss are the types of power losses in inductor.

In synchronous motor, does the winding losses vary with load?

Description : In synchronous motor, does the winding losses vary with load?

Last Answer : No, in the synchronous motor the winding losses do not vary with load.

Explain the on state losses in power BJT.

Description : Explain the on state losses in power BJT.

Last Answer : On state losses in power BJT: Transistor have four types of losses one is turn on state losses second is turn off state losses third is turn on switching losses and fourth is turn ... ON = VCE sat x IC With increasing collector current collector to emitter saturation voltage increases.

Electrical specifications with values for washing machine.

Description : Electrical specifications with values for washing machine.

Last Answer : 1. Type: Top loading / Front loading type 2. Capacity range: 6kg to 15kg 3. Motor Used: Induction motor 4. Input voltage: 100V- 240V 5. Power: in 1200W / Output power 100–400W{can go upto 1000W) 6. Efficiency: Max efficiency 31% 7. Wattage: 2.100-2.400 W 8. Current: 13A 9. Frequency: 50hz

function of exposer in photocopier machine.

Description : function of exposer in photocopier machine.

Last Answer : A bright lamp illuminates the original document, and the whitws areas of the original document reflect the light onto the surface of the photoconductive drum. The areas of the drum that are exposed ... discharge to the ground. The areas of the drum not exposed to light remains negatively charged

Draw block diagram for CNC drilling machine and explain its working.

Description : Draw block diagram for CNC drilling machine and explain its working.

Last Answer : Block diagram consist of the following points: Machine tool with DC servo motor as feedback element. The transducer is added as adaptive control application. The auxiliary controller ... line. The interrupt pulses are generated by TBG and supplied to computer through inter

Anyone care to join me in a quiet prayer for Jeret "Speedy" Peterson?

Description : Anyone care to join me in a quiet prayer for Jeret "Speedy" Peterson?

Last Answer : Not to sound cold, but it won’t help at this point.

What is the function of the roll forming machine ?

Description : What is the function of the roll forming machine ?

Last Answer : It is much easier to make croissants and other dinner rolls with a roll forming machine, than it is to roll the croissants by hand. The primary function, therefore, is to take the mixed dough and to thin it, then fold it, to prepare the dough for baking.

How to Repair a Washing Machine

Description : How to Repair a Washing Machine

Last Answer : How to Repair a Washing Machine One of the modern conveniences that most people cannot live without is their washing machine. Washing machines have become extremely commonplace in today's homes and while ... store for more information on fixing it, or whether it is worth replacing the entire unit.

How to Repair a Sewing Machine

Description : How to Repair a Sewing Machine

Last Answer : How to Repair a Sewing Machine As being one of the more heavy-duty appliances, sewing machines can provide many years of reliable use. Often they do need to be cleaned out due to the excess ... it does, you will have to increase the belt's tension by shifting the motor-mountain screws again.

How to Thread a Sewing Machine

Description : How to Thread a Sewing Machine

Last Answer : How to Thread a Sewing Machine So you finally found a pattern you want to sew. You've got your mom's trusty sewing machine out, but before you can start sewing away, you must first learn to thread the ... be an easy task. Soon, you'll be a whiz at threading a sewing machine and at sewing, too!

How to Clean a Washing Machine

Description : How to Clean a Washing Machine

Last Answer : How to Clean a Washing Machine You need a washing machine to clean all your clothes and have them smelling clean, so have you ever thought about what it takes to keep the actual machine clean? ... of the washing machine dry. Repeat cleaning the front load washing machine at least once a month.

10 Benefits of climber machine

Description : 10 Benefits of climber machine

Last Answer : 10 Benefits of climber machine The climber machine is tall, slim machine pinched away in the corner of the gym. Maybe you've seen someone on it apparently with his personal trainer in ferry. It's ... that will give more strength to the arms and legs and will increase the strength of the body too.

How to choose a rowing machine and how to use it?

Description : How to choose a rowing machine and how to use it?

Last Answer : Many people know that it is easy to calculate rowing athletes against the background of other people by a special article. The beauty of their figure is formed during rowing sessions, which provide an ... times for 10 minutes with 10-minute breaks, this will be tantamount to one 30-minute lesson.

Capsule coffee machine. What are the advantages?

Description : Capsule coffee machine. What are the advantages?

Last Answer : Having a coffee maker in the house helps us to easily cheer up and brighten up the beginning of the upcoming day in the morning, especially if the weather is unpleasant. A cup of hot ... favor is the fact that the profile of this manufacturer is precisely capsule coffee makers and coffee capsules.

How to choose a washing machine?

Description : How to choose a washing machine?

Last Answer : How to choose a washing machine? When choosing a washing machine, first of all, you need to think about the future location of its placement. According to what space you have, choose: ... occurs using a fairly simple method - the machine includes an additional rinse cycle. Enjoy the shopping!

Explain the basic parts of a slotting machine with neat sketch.

Description : Explain the basic parts of a slotting machine with neat sketch.

Last Answer : Base or Bed The base is rigidly built to take up all the cutting forces and the entire load of the machine. The top of the bed is accurately finished to provide guideways on which ... return mechanism. 2. Variable speed reversible motor drive mechanism. 3. Hydraulic drive mechanism.

Write down the basic parts of a lathe machine with their proper functions.

Description : Write down the basic parts of a lathe machine with their proper functions.

Last Answer : Important Parts of Lathe and their Functions 1. Bed It is the main body of the machine. All main components are bolted on it. It is usually made by cast iron due to its high compressive strength and ... carriage on bed. 12. Spindle: It is the main part of lathe which holds and rotates the chuck.

Write down the steps involved for internal thread cutting on lathe machine.

Description : Write down the steps involved for internal thread cutting on lathe machine.

Last Answer : Steps involved for internal thread cutting on lathe machine 1) Hole is first bored to the root diameter of the thread. 2) Tool is fixed on the tool post or on the boring bar adjusted the angle of ... the start. 10) Keep going until the calculated depth of cut has been reached on the top slide.

anonymous · Answer 1 · 2017-09-27T16:13:13+0000

Iron loss, copper loss and mechanical losses these are the losses in DC machine.

what are the losses in DC machine?

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