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From which material field coils of DC generator are made of?
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asked
Mar 3, 2018
by
anonymous
From which material field coils of DC generator are made of?
material
field
coils
dc
generator
made
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answered
Mar 3, 2018
by
anonymous
Field coils of DC generator are usually made of
copper
.
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asked
Mar 21, 2018
by
anonymous
Flashing the field of D.C. generator means?
Last answer:
Flashing the field of D.C. generator means creating residual magnetism by a D.C. source.
flashing
field
generator
dc
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1
answer
asked
Mar 20, 2018
by
anonymous
Magnetic field in a D.C. generator is produced by?
Last answer:
Magnetic field in a D.C. generator is produced by electromagnets.
magnetic
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dc
generator
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1
answer
asked
Mar 21, 2018
by
anonymous
The purpose of providing dummy coils in a generator is?
Last answer:
The purpose of providing dummy coils in a generator is to provide mechanical balance for the rotor.
dummy
coils
generator
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1
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asked
Mar 3, 2018
by
anonymous
Brushes of DC machine are made up of ?
Brushes of DC machine are made up of ?
Last answer:
Brushes of DC machine are made up of carbon.
brushes
dc
machine
made
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1
answer
asked
Apr 29, 2018
by
anonymous
In a DC generator the windings of interpoles are connected :
In a DC generator the windings of interpoles are connected : (A) in series with main field winding, to create a pole,of same polarity as the main pole ahead in the direction of rotation. (B) in series with main field winding, to create a pole of opposite polarity as the main pole ahead in the direction of ... in the direction of rotation. (D) in series with the armature winding, to create a pole of opposite polarity as the main pole ahead in the direction of rotation.
Last answer:
In a DC generator the windings of interpoles are connected : in series with the armature winding, to create a pole of same polarity as the main pole ahead in the direction of rotation.
dc
generator
windings
interpoles
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asked
Aug 9, 2017
by
anonymous
Field control of DC motor
Field control of DC motor
Last answer:
Field control of DC motor
field
control
dc
motor
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2
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asked
Mar 21, 2018
by
anonymous
A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave?
Last answer:
A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will be of 5 Hz.
sinusoidal
field
shunt
generator
armature
voltage
wave
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asked
Jul 27, 2019
by
anonymous
State the function of commutator in DC generator and name the material used for commutator.
State the function of commutator in DC generator and name the material used for commutator.
Last answer:
Function of Commutator: Commutator converts AC induced in armature winding into DC for external load. Material: i) Commutator segments are made up of Copper. ii) Commutator segments are insulated from each other by Mica.
commutator
dc
generator
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1
answer
asked
May 1, 2018
by
anonymous
The fall in speed of a dc generator due to increase in load can be corrected by
The fall in speed of a dc generator due to increase in load can be corrected by (1) cooling the armature.. (2) increasing the excitation. (3) reducing the load voltage. (4) increasing the input to the prime mover
Last answer:
It can be corrected by increasing the input to the prime mover.
speed
dc
generator
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2
answers
asked
Mar 15, 2018
by
anonymous
What is the principle of DC generator?
What is the principle of DC generator?
principle
dc
generator
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asked
Mar 3, 2018
by
anonymous
Why is the armature of DC generator laminated?
Why is the armature of DC generator laminated?
Last answer:
The armature of DC generator is laminated to reduce eddy current losses.
armature
dc
generator
laminated
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asked
May 8, 2018
by
anonymous
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2
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
dc
machine
supplies
generator
armature
resistance
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asked
Mar 15, 2018
by
anonymous
What is the difference between an AC and DC generator?
What is the difference between an AC and DC generator?
Last answer:
The generator which generates DC voltage is called DC generator and generator which generates AC voltage is called AC generator (or) Alternator. In DC generator armature is rotated and field winding ... generator. A DC generator can generate low voltages but an AC generator can generate upto 11kv.
difference
between
ac
dc
generator
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asked
Mar 20, 2018
by
anonymous
In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be?
Last answer:
In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be 8.
dc
generator
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1
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asked
Mar 20, 2018
by
anonymous
In a A.C. series motor armature coils are usually connected to commutator?
Last answer:
In a A.C. series motor armature coils are usually connected to commutator through resistance.
ac
series
motor
armature
coils
usually
commutator
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1
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asked
Mar 20, 2018
by
anonymous
If the field of a D.C. shunt motor gets opened while motor is running?
Last answer:
If the field of a D.C. shunt motor gets opened while motor is running the motor will attain dangerously high speed.
field
dc
shunt
motor
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1
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asked
Mar 21, 2018
by
anonymous
In a D.C. generator in case the resistance of the field winding is increased, then output voltage will?
Last answer:
In a D.C. generator in case the resistance of the field winding is increased, then output voltage will decrease.
dc
generator
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asked
Mar 20, 2018
by
anonymous
The armature core of a D.C. generator is usually made of?
Last answer:
The armature core of a D.C. generator is usually made of silicon steel.
armature
core
dc
generator
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1
answer
asked
Apr 30, 2018
by
anonymous
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density.
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : (A) 256 W (B) 320 W (C) 500 W (D) 625 W
Last answer:
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W
eddy
current
loss
dc
generator
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1
answer
asked
Apr 28, 2018
by
anonymous
The terminal characteristics of a dc generator suitable for electric welders is
The terminal characteristics of a dc generator suitable for electric welders is (A) separately excited generator (B) shunt generator (C) series generator (D) differentially compounded generator
Last answer:
The terminal characteristics of a dc generator suitable for electric welders is differentially compounded generator
terminal
characteristics
dc
generator
electric
welders
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1
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asked
Mar 20, 2018
by
anonymous
If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be?
Last answer:
If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be crossmagnetisation as well as demagnetising.
generator
dc
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1
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asked
Mar 20, 2018
by
anonymous
In a D.C. generator the ripples in the direct e.m.f. generated are reduced by?
Last answer:
In a D.C. generator the ripples in the direct e.m.f. generated are reduced by using carbon brushes of superior quality.
dc
generator
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1
answer
asked
Mar 20, 2018
by
anonymous
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens?
Last answer:
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.
dc
shunt
motor
working
full
load
field
circuit
suddenly
opens
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1
answer
asked
Mar 20, 2018
by
anonymous
The rotor of a hysteresis motor is made of?
Last answer:
The rotor of a hysteresis motor is made of chrome steel.
rotor
hysteresis
motor
made
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1
answer
asked
Mar 21, 2018
by
anonymous
The critical resistance of the D.C. generator is the resistance of?
Last answer:
The critical resistance of the D.C. generator is the resistance of field.
critical
resistance
dc
generator
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1
answer
asked
Mar 21, 2018
by
anonymous
In a D.C. generator the critical resistance refers to the resistance of?
Last answer:
In a D.C. generator, the critical resistance refers to the resistance of field.
dc
generator
resistance
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1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when?
Last answer:
In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when number of poles is 2.
generator
dc
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1
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asked
Mar 20, 2018
by
anonymous
The demagnetising component of armature reaction in a D.C. generator?
Last answer:
The demagnetising component of armature reaction in a D.C. generator reduces generator e.m.f.
demagnetising
component
armature
reaction
dc
generator
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1
answer
asked
Mar 20, 2018
by
anonymous
For a D.C. generator when the number of poles and the number of armature conductors is fixed...
For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?
Last answer:
Wave winding
dc
generator
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1
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asked
Mar 20, 2018
by
anonymous
The armature of D.C. generator is laminated to
armature
dc
generator
laminated
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178
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0
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asked
Mar 20, 2018
by
anonymous
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.
losses
dc
generator
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1
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asked
Mar 21, 2018
by
anonymous
The two pressure coils of a single phase power factor meter have?
Last answer:
The two pressure coils of a single phase power factor meter have the same dimensions and the same number of turns.
two
pressure
coils
single
phase
power
factor
meter
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76
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1
answer
asked
Mar 21, 2018
by
anonymous
If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?
Last answer:
If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be zero.
residual
magnetism
dc
generator
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190
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1
answer
asked
Mar 21, 2018
by
anonymous
A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be?
Last answer:
A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be about 2 V.
generator
dc
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264
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1
answer
asked
Mar 21, 2018
by
anonymous
In a level compounded D.C. generator, full load terminal voltage is?
Last answer:
In a level compounded D.C. generator, full load terminal voltage is equal to no-load terminal voltage.
level
compounded
dc
generator
full
load
terminal
voltage
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75
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1
answer
asked
Mar 21, 2018
by
anonymous
A D.C. generator can be considered as?
Last answer:
A D.C. generator can be considered as rotating amplifier.
dc
generator
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57
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1
answer
asked
Mar 21, 2018
by
anonymous
If a D.C. generator fails to build up the probable cause could not be?
Last answer:
If a D.C. generator fails to build up the probable cause could not be field resistance less than the critical resistance.
generator
dc
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71
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1
answer
asked
Mar 21, 2018
by
anonymous
In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when?
Last answer:
In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when there is no load on|he generator.
dc
generator
magnetic
neutral
geometrical
axis
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126
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1
answer
asked
Mar 21, 2018
by
anonymous
The e.m.f. generated in a D.C. generator is directly proportional to?
Last answer:
The e.m.f. generated in a D.C. generator is directly proportional to speed of armature.
dc
generator
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303
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1
answer
asked
Mar 20, 2018
by
anonymous
D.C. generator generally preferred for charging automobile batteries is?
Last answer:
D.C. generator generally preferred for charging automobile batteries is long shunt compound generator.
dc
generator
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177
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1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. generator the actual flux distribution depends upon?
dc
generator
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75
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0
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asked
Mar 20, 2018
by
anonymous
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.
dc
generator
iron
losses
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240
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1
answer
asked
Mar 20, 2018
by
anonymous
The condition for maximum efficiency for a D.C. generator is?
Last answer:
The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.
condition
maximum
efficiency
dc
generator
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153
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1
answer
asked
Mar 21, 2018
by
anonymous
Standard resistor is made from?
Last answer:
Standard resistor is made from maganin.
standard
resistor
made
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43
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1
answer
asked
May 1, 2018
by
anonymous
The desirable properties of transformer core material are
The desirable properties of transformer core material are (1) low permeability and low hysteresis loss. (2) high permeability and high hysteresis loss. (3) high permeability and low hysteresis loss. (4) low permeability and hysteresis loss.
Last answer:
The desirable properties of transformer core material are high permeability and low hysteresis loss.
desirable
properties
transformer
core
material
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1
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asked
Mar 3, 2018
by
anonymous
In DC generators lamination core are generally made of?
In DC generators lamination core are generally made of?
Last answer:
In DC generators lamination core are generally made of silicon steel.
dc
generators
lamination
core
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135
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1
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asked
Mar 19, 2018
by
anonymous
D.C. shunt relays are made of?
D.C. shunt relays are made of?
Last answer:
D.C. shunt relays are made of many turns of thin wire.
d
c
shunt
relays
made
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2.6k
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1
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asked
Apr 29, 2018
by
anonymous
In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load
In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load (A) The armature current increases and the power factor decreases (B) The armature current decreases and the power factor also decreases (C) The armature current decreases and the power factor increases but is lagging (D) The armature current decreases and the power factor increases and is leading
Last answer:
In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load The armature current decreases and the power factor increases and is leading
synchronous
generator
excitation
normal
value
fixed
load
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88
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1
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asked
Dec 16, 2017
by
anonymous
What are the main parts of a generator?
What are the main parts of a generator?
Last answer:
the main parts of the generator are as follows yoke Armature Poles field winding Prime mover Commutator Shaft Bearings Brushes
main
parts
generator
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asked
May 1, 2018
by
anonymous
In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation,
In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator
Last answer:
In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as synchronous generator
synchronous
machine
field
flux
axis
armature
direction
rotation
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