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Iron losses in a D.C. machine are independent of variations in?
Mar 20, 2018
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Iron losses in a D.C. machine are independent of variations in
Mar 20, 2018
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In a D.C. generator, the iron losses mainly take place in?
In DC motor iron losses are occurred in?
what are the losses in DC machine?
What is the percentage of stray losses in DC machine?
The total losses in a well designed D.C. generator of 10 kW will be nearly?
In a D.C. machine stray loss is the sum of?
To avoid formation of grooves in the commutator of a D.C. machine?
In a D.C. machine, short-circuited field coil will result in?
In a four-pole D.C. machine?
In case of D.C. machine winding, number of commutator segments is equal to?
Open circuited armature coil of a D.C. machine is?
In case of D.C. machines, mechanical losses are primary function of?
Losses in dc machine..?
Eddy currents are induced in the pole shoes of a D.C. machine due to?
In a dc machine, interpoles are used to
The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors
Why poles of dc machine are laminated?
Brushes of DC machine are made up of ?
The magnetic neutral plane shifts in a dc machine
Explain concept of back emf in DC machine. State how it governs armature current.
If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be?
Aluminium is not used as winding wire for the armature of a dc machine because
In a D.C. generator the ripples in the direct e.m.f. generated are reduced by?
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2
A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?
When two D.C. series generators are running in parallel, an equilizer bar is used?
Compensating windings are used in D.C. generators?
In D.C. generators the pole shoes are fastened to the pole core by?
What are the losses in a transmission line?
At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total
In a D.C. generator in case the resistance of the field winding is increased, then output voltage will?
In a D.C. generator the critical resistance refers to the resistance of?
In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when?
The demagnetising component of armature reaction in a D.C. generator?
In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be?
Brushes of D.C. machines are made of?
What are the types of power losses in inductor?
If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?
In a level compounded D.C. generator, full load terminal voltage is?
In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when?
The e.m.f. generated in a D.C. generator is directly proportional to?
In a D.C. generator the actual flux distribution depends upon?
Magnetic field in a D.C. generator is produced by?
D.C. generators are connected to the busbars or disconnected from them only under the floating condition?
D.C. generators are installed near the load centres to reduce?
D.C. generators are normally designed for maximum efficiency around?
In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilised is called?
The friction losses in Real Transformers are :
Reduction in core losses and increase in permeability are obtained with transformer employing?