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D.C. generators are installed near the load centres to reduce?
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Mar 20, 2018
by
anonymous
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Mar 20, 2018
by
anonymous
D.C. generators are installed near the load centres to reduce
line losses.
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asked
Mar 20, 2018
by
anonymous
D.C. generators are connected to the busbars or disconnected from them only under the floating condition?
Last answer:
D.C. generators are connected to the busbars or disconnected from them only under the floating condition to avoid sudden loading of the primemover, to avoid mechanicaljerk to the shaft, to avoid burning of switch contacts.
dc
generators
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asked
Mar 20, 2018
by
anonymous
In D.C. generators the pole shoes are fastened to the pole core by?
Last answer:
In D.C. generators the pole shoes are fastened to the pole core by counter sunk screws.
dc
generators
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asked
Mar 21, 2018
by
anonymous
When two D.C. series generators are running in parallel, an equilizer bar is used?
Last answer:
If equalising bar is connected to the 2 DC generators the current will be equal in 2 generators irrespective of parallel connection so that we connect equaliser bar
series
generators
dc
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Mar 20, 2018
by
anonymous
Compensating windings are used in D.C. generators?
Last answer:
Compensating windings are used in D.C. generators to neutralise the cross-magnetising effect of the armature reaction.
compensating
windings
generators
dc
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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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asked
Mar 20, 2018
by
anonymous
In D.C. generators, current to the external circuit from armature is given through?
Last answer:
In D.C. generators, current to the external circuit from armature is given through commutator commutator.
dc
generators
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asked
Mar 20, 2018
by
anonymous
In D.C. generators the polarity of the interpoles?
Last answer:
In D.C. generators the polarity of the interpoles is the same as that of the main pole ahead.
dc
generators
polarity
interpoles
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asked
Mar 20, 2018
by
anonymous
For the parallel operation of two or more D.C. compound generators, we should ensure that?
Last answer:
For the parallel operation of two or more D.C. compound generators, we should ensure that series fields of all generators should be either on positive side or negative side of the armature.
parallel
operation
dc
compound
generators
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asked
Mar 20, 2018
by
anonymous
In D.C. generators, the brushes on commutator remain in contact with conductors which?
Last answer:
In D.C. generators, the brushes on commutator remain in contact with conductors which lie under interpolar region.
dc
generators
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asked
Apr 30, 2018
by
anonymous
Identify the increasing order of voltage regulation of the following dc generators a same load :
Identify the increasing order of voltage regulation of the following dc generators a same load : (A) differential compound, shunt and under compound (B) shunt, differential compound and under compound (C) under compound, shunt and differential compound (D) shunt, under compound and differential compound
Last answer:
Identify the increasing order of voltage regulation of the following dc generators a same load : under compound, shunt and differential compound
voltage
regulation
dc
generators
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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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130
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1
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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
Generators for peak load plants are usually designed for maximum efficiency at?
Last answer:
Generators for peak load plants are usually designed for maximum efficiency at 50 to 75 percent full load.
generators
peak
load
plants
designed
maximum
efficiency
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1
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asked
Apr 28, 2018
by
anonymous
Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power
Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, respectively. Then the system frequency is (A) 50 Hz (B) 51 Hz (C) 51.25 Hz (D) 51.5 Hz
Last answer:
Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, respectively. Then the system frequency is 50 Hz
synchronous
generators
operating
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asked
Aug 19, 2019
by
anonymous
Why are generators rated in kVA not in kW ?
Why are generators rated in kVA not in kW ?
Last answer:
Because It's rating of generator kva is apparent power. Kw is active power which we use. And one is kvar reactive power.
generators
kva
kw
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3
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asked
May 3, 2018
by
anonymous
Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component
Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component of load. To shift part of KVAR from G2 to G1, while keeping terminal voltage fixed, the following action must be done
Last answer:
Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component of load. To shift part of KVAR from G2 to G1, while keeping terminal voltage fixed, the following action must be done Raise If1 and lower If2
synchronous
generators
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asked
Mar 20, 2018
by
anonymous
Large capacity generators are invariably?
Last answer:
Large capacity generators are invariably hydrogen cooled.
large
capacity
generators
invariably
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asked
Mar 20, 2018
by
anonymous
Eddy currents are induced in the pole shoes of a D.C. machine due to?
Last answer:
Eddy currents are induced in the pole shoes of a D.C. machine due to relative rotation between field and armature.
dc
eddy
currents
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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
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
Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be?
Last answer:
Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be cumulatively compounded.
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motor
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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
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asked
Mar 20, 2018
by
anonymous
Brushes of D.C. machines are made of?
Last answer:
Brushes of D.C. machines are made of carbon.
brushes
dc
machines
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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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1
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asked
Mar 21, 2018
by
anonymous
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.
commutator
dc
machine
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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 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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1
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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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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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answers
asked
Mar 20, 2018
by
anonymous
The purpose of retardation test on D.C. shunt machines is to find out?
Last answer:
The purpose of retardation test on D.C. shunt machines is to find out stray losses.
dc
shunt
machines
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asked
Mar 20, 2018
by
anonymous
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.
machine
winding
dc
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1
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asked
May 25, 2018
by
anonymous
If a self excited d.c. generator after being installed, fails to build up voltage on its first trial run, the first
If a self excited d.c. generator after being installed, fails to build up voltage on its first trial run, the first thing to do is (a) reverse the field winding connections (b) increase the field resistance (c) decrease the speed of prime mover (d) increase the speed of prime mover
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asked
Mar 20, 2018
by
anonymous
D.C. motor is to a drive a load which is almost nil for certain part of the load cycle...
D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select the?
Last answer:
D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select the compound motor.
dc
motor
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1
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asked
Mar 20, 2018
by
anonymous
D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value...
D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the?
Last answer:
D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the series motor.
dc
motor
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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
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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183
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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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250
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1
answer
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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109
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1
answer
asked
Mar 21, 2018
by
anonymous
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.
dc
machine
stray
loss
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93
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1
answer
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 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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122
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1
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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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594
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1
answer
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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85
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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
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 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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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
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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239
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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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145
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1
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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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