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D.C. generators are normally designed for maximum efficiency around?
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asked
Mar 20, 2018
by
anonymous
dc
generators
normally
designed
maximum
efficiency
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answered
Mar 20, 2018
by
anonymous
D.C. generators are normally designed for maximum efficiency around
full-load.
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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
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1
answer
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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
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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2
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asked
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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1
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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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1
answer
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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Mar 20, 2018
by
anonymous
D.C. generators are installed near the load centres to reduce?
Last answer:
D.C. generators are installed near the load centres to reduce line losses.
dc
generators
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1
answer
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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1
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asked
Mar 20, 2018
by
anonymous
The efficiency of a properly designed synchronous motor will usually fall in range?
Last answer:
The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.
efficiency
designed
synchronous
motor
usually
range
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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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1
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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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1
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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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1
answer
asked
Mar 19, 2018
by
anonymous
For a transformer, operating at constant load current, maximum efficiency will occur at?
For a transformer, operating at constant load current, maximum efficiency will occur at?
Last answer:
For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.
transformer
operating
constant
load
current
maximum
efficiency
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1
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asked
Mar 19, 2018
by
anonymous
An ideal transformer will have maximum efficiency at a load such that?
Last answer:
An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.
ideal
transformer
maximum
efficiency
load
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1
answer
asked
Sep 30, 2017
by
anonymous
when will be the maximum efficiency of transformer?
Last answer:
Transformer efficiency is maximum when copper losses are equal to iron losses.
transformer
maximum
efficiency
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1
answer
asked
Mar 20, 2018
by
anonymous
The condition for maximum power in case of D.C. motor is?
condition
maximum
power
dc
motor
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0
answers
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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1
answer
asked
Mar 20, 2018
by
anonymous
Which D.C. motor has got maximum self relieving property ?
Last answer:
Series motor has got maximum self relieving property.
dc
motor
maximum
self
property
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1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be?
Last answer:
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.
dc
shunt
motor
conditions
maximum
power
current
armature
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1
answer
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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1
answer
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Sep 6, 2018
by
anonymous
State maximum power transfer theorem for DC circuit.
State maximum power transfer theorem for DC circuit.
Last answer:
Maximum power transfer theorem for DC circuit: The maximum power transfer theorem states that the source or a network transfers maximum power to load only when the load resistance is equal ... removed (disconnected) ii) All internal independent sources are replaced by their internal resistances.
maximum
power
transfer
theorem
dc
circuit
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1
answer
asked
Mar 20, 2018
by
anonymous
In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be?
Last answer:
In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be less than 50%.
dc
motor
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1
answer
asked
Mar 19, 2018
by
anonymous
Distribution transformers are generally designed for maximum efficiency around?
Last answer:
Distribution transformers are generally designed for maximum efficiency around 50% load.
transformers
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1
answer
asked
Mar 20, 2018
by
anonymous
Air blast circuit breakers for 400 kV power system are designed to operate in?
Last answer:
Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.
air
blast
circuit
breakers
power
system
designed
operate
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179
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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
answer
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
answer
asked
Apr 28, 2018
by
anonymous
Phase modifier is normally installed
Phase modifier is normally installed
Last answer:
Phase modifier is normally installed in case of long lines
phase
modifier
normally
installed
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274
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1
answer
asked
Mar 18, 2018
by
anonymous
If the load of the normally excited synchronous motor is increased the power factor will?
If the load of the normally excited synchronous motor is increased the power factor will?
Last answer:
If the load of the normally excited synchronous motor is increased the power factor will become lagging.
load
normally
excited
synchronous
motor
increased
power
factor
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82
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1
answer
asked
Mar 22, 2018
by
anonymous
The overall efficiency of steam locomotive is around?
Last answer:
The overall efficiency of steam locomotive is around 5 to 10 percent.
overall
efficiency
steam
locomotive
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1
answer
asked
Mar 19, 2018
by
anonymous
Power transformers are generally designed to have maximum efficiency around?
Last answer:
Power transformers are generally designed to have maximum efficiency around near full-load.
transformers
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74
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1
answer
asked
May 3, 2020
by
anonymous
Explain the lighting scheme to be designed for each of the following: i) Special ward in hospitals ii) Dentist’s Cabin
Explain the lighting scheme to be designed for each of the following: i) Special ward in hospitals ii) Dentist’s Cabin
Last answer:
i) Special ward in hospital: For the patients in the wards, lighting should create a cozy and pleasant atmosphere. Lighting in the wards should be planned in such a way that it meets the specific ... we use such as cements and bonding agents that we use to restore your teeth back to health.
explain
the
lighting
scheme
to
be
designed
for
each
of
following
i
special
ward
in
hospitals
ii
dentists
cabin
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1
answer
asked
May 8, 2018
by
anonymous
What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to
What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be excessive (B) Current will be too much high (C) Transformer may start to smoke and burn (D) No effect
Last answer:
What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be ... will be too much high (C) Transformer may start to smoke and burn (D) No effect
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transformer
designed
operation
frequency
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1
answer
asked
Mar 20, 2018
by
anonymous
Overhead system can be designed for operation up to?
Last answer:
Overhead system can be designed for operation up to 400 kV.
overhead
system
designed
operation
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1
answer
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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94
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3
answers
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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262
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1
answer
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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67
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1
answer
asked
Mar 26, 2018
by
anonymous
The maximum torque of d.c. motors is limited by?
The maximum torque of d.c. motors is limited by?
Last answer:
The maximum torque of d.c. motors is limited by commutation.
maximum
torque
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297
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1
answer
asked
May 8, 2018
by
anonymous
A circuit breaker is designed to protect an electrical circuit from damage caused by :
A circuit breaker is designed to protect an electrical circuit from damage caused by : (A) Over load (B) Short circuit (C) Over current (D) All of the above
Last answer:
A circuit breaker is designed to protect an electrical circuit from damage caused by : (A) Over load (B) Short circuit (C) Over current (D) All of the above
circuit
breaker
designed
protect
electrical
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75
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1
answer
asked
Mar 19, 2018
by
anonymous
An efficient and a well designed protective relaying should have?
Last answer:
An efficient and a well designed protective relaying should have good selectivity and reliability, economy and simplicity, high speed and selectivity.
efficient
designed
protective
relaying
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85
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1
answer
asked
Mar 19, 2018
by
anonymous
Relays can be designed to respond to changes in?
Last answer:
Relays can be designed to respond to changes in resistance, reactance or impedance voltage and current, light intensity, temperature.
relays
designed
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80
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1
answer
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 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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128
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1
answer
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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139
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1
answer
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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96
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1
answer
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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1
answer
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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111
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1
answer
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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82
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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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174
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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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80
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1
answer
asked
Aug 25, 2019
by
anonymous
method for improving string efficiency
method for improving string efficiency
Last answer:
The Methods of Improving String Efficiency:- 1) By reducing value of ‘m’ or (‘k’) by using longer cross arm. 2) By Making of ‘m’ or (‘k’) equal to zero 3) By grading Insulator. 4) By Using guard ring.
improving
string
efficiency
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41
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1
answer
...