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The total losses in a well designed D.C. generator of 10 kW will be nearly?
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Mar 20, 2018
by
anonymous
losses
dc
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Mar 20, 2018
by
anonymous
The total losses in a well designed D.C. generator of 10 kW will be nearly
500 W.
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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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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
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
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 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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1
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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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asked
Mar 20, 2018
by
anonymous
Iron losses in a D.C. machine are independent of variations in?
Last answer:
Iron losses in a D.C. machine are independent of variations in load.
iron
losses
dc
machine
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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 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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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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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
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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
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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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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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asked
Mar 20, 2018
by
anonymous
In a D.C. generator the actual flux distribution depends upon?
dc
generator
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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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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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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
field
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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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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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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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
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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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asked
Mar 20, 2018
by
anonymous
The armature of D.C. generator is laminated to
armature
dc
generator
laminated
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answers
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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1
answer
asked
Mar 21, 2018
by
anonymous
In D.C. generators on no-load, the air gap flux distribution in space is?
Last answer:
In D.C. generators on no-load, the air gap flux distribution in space is flat topped.
dc
generator
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1
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asked
Mar 20, 2018
by
anonymous
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.
mechanical
losses
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1
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asked
Mar 8, 2018
by
anonymous
What is the percentage of stray losses in DC machine?
What is the percentage of stray losses in DC machine?
Last answer:
Percentage of stray losses in DC machine is about 1 % .
percentage
stray
losses
dc
machine
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1
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asked
Sep 27, 2017
by
anonymous
what are the losses in DC machine?
Last answer:
Iron loss, copper loss and mechanical losses these are the losses in DC machine.
losses
dc
machine
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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 26, 2018
by
anonymous
In DC motor iron losses are occurred in?
In DC motor iron losses are occurred in?
Last answer:
In DC motor iron losses are occurred in the armature.
dc
motor
iron
losses
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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 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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1
answer
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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132
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1
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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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84
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1
answer
asked
Mar 20, 2018
by
anonymous
D.C. generators are normally designed for maximum efficiency around?
Last answer:
D.C. generators are normally designed for maximum efficiency around full-load.
dc
generators
normally
designed
maximum
efficiency
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1
answer
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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1
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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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60
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0
answers
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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135
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1
answer
asked
Mar 3, 2018
by
anonymous
From which material field coils of DC generator are made of?
From which material field coils of DC generator are made of?
Last answer:
Field coils of DC generator are usually made of copper.
material
field
coils
dc
generator
made
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96
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1
answer
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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283
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1
answer
asked
Mar 21, 2018
by
anonymous
A cumulatively compounded long shunt generator when operating as a motor would be?
Last answer:
A cumulatively compounded long shunt generator when operating as a motor would be differentially compounded long shunt.
cumulatively
compounded
long
shunt
generator
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79
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1
answer
asked
Mar 20, 2018
by
anonymous
Welding generator will have?
Last answer:
Welding generator will have lap winding.
welding
generator
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57
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1
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asked
Mar 20, 2018
by
anonymous
In a D.C. machine, short-circuited field coil will result in?
dc
machine
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asked
Mar 20, 2018
by
anonymous
If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor?
Last answer:
If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor.
ambient
temperature
motor
dc
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75
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1
answer
asked
Mar 21, 2018
by
anonymous
The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm...
The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be?
Last answer:
The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be 580 V.
shunt
generator
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296
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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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239
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1
answer
asked
Mar 21, 2018
by
anonymous
In case of a flat compounded generator?
Last answer:
In case of a flat compounded generator voltage remains constant irrespective of the load.
case
flat
compounded
generator
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61
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1
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asked
Mar 21, 2018
by
anonymous
In a separately excited generator supplying rated load the armature reaction?
Last answer:
In a separately excited generator supplying rated load the armature reaction is always present.
separately
excited
generator
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1
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asked
Mar 21, 2018
by
anonymous
In a shunt generator the voltage build up is generally restricted by?
shunt
generator
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