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How the two winding transformer is linked ?
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asked
Aug 9, 2017
by
anonymous
How the two winding transformer is linked ?
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2
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Speak Answer
answered
Aug 9, 2017
by
anonymous
Two winding transformer are Inductively linked
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Dec 8, 2017
by
jihadio k jeeja
Mutual induction
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asked
May 3, 2018
by
anonymous
A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and
A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and front pitch adopted could be respectively
Last answer:
A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and front pitch adopted could be respectively 19,17
dc
machine
simplex
lap
winding
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1
answer
asked
May 20, 2018
by
anonymous
A 400V/100 V, 10 KVA two-winding transformer is reconnected as an auto-transformer across a suitable
A 400V/100 V, 10 KVA two-winding transformer is reconnected as an auto-transformer across a suitable voltage source. The maximum rating of such an arrangement could be A) 50 KVA B) 15 KVA C) 12.5 KVA D) 8.75 KVA
Last answer:
A 400V/100 V, 10 KVA two-winding transformer is reconnected as an auto-transformer across a suitable voltage source. The maximum rating of such an arrangement could be 50 KVA
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1
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asked
Apr 25, 2018
by
anonymous
A 1100 kVA, 11 kV/1.1 kV conventional two-winding transformer is connected as a 12.1 kV/11 kV step-down ...
A 1100 kVA, 11 kV/1.1 kV conventional two-winding transformer is connected as a 12.1 kV/11 kV step-down auto-transformer. The rating of the auto-transformer is (A) 1000 kVA (B) 1100 kVA (C) 11000 kVA (D) 12100 kVA
Last answer:
A 1100 kVA, 11 kV/1.1 kV conventional two-winding transformer is connected as a 12.1 kV/11 kV step-down auto-transformer. The rating of the auto-transformer is 12100 kVA
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asked
Sep 1, 2018
by
anonymous
Compare auto transformer with two winding transformer.
Compare auto transformer with two winding transformer.
Last answer:
Autotransformer and Two winding transformer
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May 17, 2018
by
anonymous
A single-phase, 50 kVA, 250 V/500 V two winding transformer has an efficiency of 95% at full load, unity
A single-phase, 50 kVA, 250 V/500 V two winding transformer has an efficiency of 95% at full load, unity power factor. If it is re-configured as a 500 V/750 V auto-transformer, its efficiency at its new rated load at unity power factor will be (A) 95.752% (B) 97.851% (C) 98.276% (D) 99.241%
Last answer:
A single-phase, 50 kVA, 250 V/500 V two winding transformer has an efficiency of 95% at full load, unity power factor. If it is re-configured as a 500 V/750 V auto-transformer, its efficiency at its new rated load at unity power factor will be 98.276%
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asked
Apr 11, 2018
by
anonymous
A two -winding single phase transformer has a voltage regulation of 4.5% at full - load and unity power ...
A two -winding single phase transformer has a voltage regulation of 4.5% at full - load and unity power -factor. At full -load and 0.80 lagging power-factor, the voltage regulation will be: (A) 4.5% (B) less than 4.5% (C) more than 4.5% (D) none of the above
Last answer:
A two -winding single phase transformer has a voltage regulation of 4.5% at full - load and unity power -factor. At full -load and 0.80 lagging power-factor, the voltage regulation will be: more than 4.5%
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1
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asked
May 24, 2018
by
anonymous
Two generating stations G1 and G2 of ratings 10 MVA and 8 MVA respectively are linked by a line rated at 5
Two generating stations G1 and G2 of ratings 10 MVA and 8 MVA respectively are linked by a line rated at 5 MVA, 0.1 Pu reactance. Each station has a reactance of 0.5 pu. If the base MVA is 10 MVA, short-circuit MVA of G1 is
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0
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asked
Jun 17, 2018
by
anonymous
Which one is not a valid condition for the wave winding?
Which one is not a valid condition for the wave winding? A) Back pitch and front pitch are of the same sign B) Back pitch and front pitch are odd numbers C) Back pitch and front pitch may differ by two and may be equal also D) Commutator pitch is always unity
Last answer:
Which one is not a valid condition for the wave winding? A) Back pitch and front pitch are of the same sign B) Back pitch and front pitch are odd numbers C) Back pitch and front pitch may differ by two and may be equal also D) Commutator pitch is always unity
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asked
Jun 4, 2018
by
anonymous
A 200 V dc motor takes a field current of 2 A to generate a back emf of 180 V. If the field winding resistance is
A 200 V dc motor takes a field current of 2 A to generate a back emf of 180 V. If the field winding resistance is 80 Ω, the resistance of the shunt field regulator is (A) 10 Ω (B) 20 Ω (C) 100 Ω (D) 180 Ω
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asked
May 8, 2018
by
anonymous
A _________ is used to measure the stator % winding temperature of the generator.
A _________ is used to measure the stator % winding temperature of the generator. (A) Thermocouple (B) Pyrometer (C) Resistance thermometer (D) Thermometer
Last answer:
A Resistance thermometer is used to measure the stator % winding temperature of the generator.
used
measure
stator
winding
temperature
generator
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asked
Apr 29, 2018
by
anonymous
Aluminium is not used as winding wire for the armature of a dc machine because
Aluminium is not used as winding wire for the armature of a dc machine because (1) aluminium has low resistivity (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper
Last answer:
Aluminium is not used as winding wire for the armature of a dc machine because (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper
aluminium
winding
wire
armature
dc
machine
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asked
Apr 9, 2018
by
anonymous
The rotor winding of a three phase wound rotor induction motor is equipped with a three phase diode...
The rotor winding of a three phase wound rotor induction motor is equipped with a three phase diode rectifier connected to the slip rings and rectifier output is connected with chopper drive. Compared to conventional rotor resistance control scheme, the chopper controlled method A) Enhances the motor rating B) Maintains the motor rating as such C) Derates the motor D) None of the above
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answers
asked
Mar 20, 2018
by
anonymous
In case of conductively compensated D.C. series motors, the compensating winding is provided?
Last answer:
In case of conductively compensated D.C. series motors, the compensating winding is provided in series with armature winding.
dc
motors
series
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asked
Mar 20, 2018
by
anonymous
The starting winding of a single-phase motor is placed in?
Last answer:
The starting winding of a single-phase motor is placed in stator.
starting
winding
single-phase
motor
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asked
Mar 20, 2018
by
anonymous
After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on?
Last answer:
Reason is kinetic energy
single
phase
induction
motor
disconnected
supply
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2
answers
asked
Mar 20, 2018
by
anonymous
If starting winding of a single-phase induction motor is left in the circuit, it will?
Last answer:
If starting winding of a single-phase induction motor is left in the circuit, it will draw excessive current and overheat.
starting
winding
single-phase
induction
motor
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1
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asked
Mar 20, 2018
by
anonymous
Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a?
Last answer:
Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a magnetic relay.
starting
winding
single
phase
motor
refrigerator
disconnected
circuit
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1
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asked
Mar 20, 2018
by
anonymous
The purpose of stator winding in the compensated repulsion motor is to?
Last answer:
The purpose of stator winding in the compensated repulsion motor is to improve power factor and provide better speed regulation.
purpose
stator
winding
compensated
repulsion
motor
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1
answer
asked
May 18, 2018
by
anonymous
A 4-pole, 3-phase, double-layer winding is housed in a 36-slot stator for an ac machine with
A 4-pole, 3-phase, double-layer winding is housed in a 36-slot stator for an ac machine with 60o phase spread. Coil span is 7 short pitches. Number of slots in which top and bottom layers belong to different phases is (A) 24 (B) 18 (C) 12 (D) 0
Last answer:
A 4-pole, 3-phase, double-layer winding is housed in a 36-slot stator for an ac machine with 60o phase spread. Coil span is 7 short pitches. Number of slots in which top and bottom layers belong to different phases is 24
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asked
May 3, 2018
by
anonymous
A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance
A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is
Last answer:
A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is 36 Ohm
dc
shunt
motor
running
current
armature
winding
resistance
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1
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asked
Apr 29, 2018
by
anonymous
Damper winding is provided in 3 phase synchronous motors to :
Damper winding is provided in 3 phase synchronous motors to :
Last answer:
Damper winding is provided in 3 phase synchronous motors to : provide starting torque and prevent hunting
damper
winding
3-phase
synchronous
motors
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69
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1
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asked
Mar 20, 2018
by
anonymous
In D.C. machines fractional pitch winding is used?
Last answer:
In D.C. machines fractional pitch winding is used to reduce the sparking.
dc
machines
fractional
pitch
winding
used
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305
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1
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asked
Mar 20, 2018
by
anonymous
In split phase motor main winding is of?
Last answer:
In split phase motor main winding is of thick wire placed at the bottom of the slots.
split
phase
motor
main
winding
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1
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asked
Mar 20, 2018
by
anonymous
Centrifugal switch disconnects the auxiliary winding of the motor at about what percent of synchronous speed?
Last answer:
Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.
centrifugal
switch
disconnects
auxiliary
winding
motor
synchronous
speed
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1
answer
asked
Mar 3, 2018
by
anonymous
In synchronous motor, does the winding losses vary with load?
In synchronous motor, does the winding losses vary with load?
Last answer:
No, in the synchronous motor the winding losses do not vary with load.
synchronous
motor
winding
losses
vary
load
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1
answer
asked
May 17, 2018
by
anonymous
Distributed winding and short chording employed in AC machines will result in
Distributed winding and short chording employed in AC machines will result in (A) increase in emf and reduction in harmonics (B) reduction in emf and increase in harmonics (C) increase in both emf and harmonics (D) reduction in both emf and harmonics
Last answer:
Distributed winding and short chording employed in AC machines will result in reduction in both emf and harmonics
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1
answer
asked
May 8, 2018
by
anonymous
Damper winding in a synchronous motor
Damper winding in a synchronous motor
Last answer:
Damper winding in a synchronous motor Serves to start the motor.
damper
winding
synchronous
motor
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59
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1
answer
asked
Aug 13, 2019
by
Alacrity
the volt per turn of a certain single phase transformers is 1.7. the transformer has a step ratio of 3825/255volt. calculate the respective number of turns in each winding
single
phase
transformers
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asked
Oct 15, 2018
by
anonymous
In Scott connection transformer the turns ratio of main winding and teaser winding is ?
Last answer:
Turns ratio= N1/ N2 IN Scott connection Main transformer turns ratio = N1 /N2 Teaser transformer turns ratio= 0.866N1/N2 Where N1= number of turns in primary winding N2= number of turns in secondary winding
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1
answer
asked
May 22, 2018
by
anonymous
The primary winding of a 220/6 V, 50 Hz transformer is energised from 110 V, 60 Hz supply. The secondary
The primary winding of a 220/6 V, 50 Hz transformer is energised from 110 V, 60 Hz supply. The secondary output voltage will be (A) 3.6 V. (B) 2.5 V. (C) 3.0 V. (D) 6.0 V.
Last answer:
The primary winding of a 220/6 V, 50 Hz transformer is energised from 110 V, 60 Hz supply. The secondary output voltage will be 3.0 V.
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1
answer
asked
May 13, 2018
by
anonymous
In a transformer, low voltage winding is placed near the core in case of concentric windings so
In a transformer, low voltage winding is placed near the core in case of concentric windings so as to 1. Reduce the leakage flux 2. Reduce the insulation requirement 3. Reduce the risk of voltage shock in case of insulation breakdown 4. Reduce the core loss From these, the correct answer is (a) 1, 2, 3 (b) 2, 3, 4 (c) 1, 2, 3, 4 (d) 2, 3
Last answer:
In a transformer, low voltage winding is placed near the core in case of concentric windings so as to 1. Reduce the leakage flux 2. Reduce the insulation requirement 3. Reduce the risk of voltage shock in case of insulation breakdown 4. Reduce ... ) 1, 2, 3 (b) 2, 3, 4 (c) 1, 2, 3, 4 (d) 2, 3
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1
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asked
Apr 9, 2018
by
anonymous
The primary winding of a 220/6 V, 50 Hz transformer is energised from 110 V, 60 Hz supply. The secondary ...
The primary winding of a 220/6 V, 50 Hz transformer is energised from 110 V, 60 Hz supply. The secondary output voltage will be; (A) 3.6 (B) 2.5 V (C) 3.0 V (D) 6.0 V
Last answer:
The primary winding of a 220/6 V, 50 Hz transformer is energised from 110 V, 60 Hz supply. The secondary output voltage will be: 3.0 V
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573
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1
answer
asked
Mar 27, 2018
by
anonymous
The low voltage winding of a 400/230 V, 1-phase, 50 Hz transformer is to...
The low voltage winding of a 400/230 V, 1-phase, 50 Hz transformer is to be connected to a 25 Hz, the supply voltage should be
Last answer:
The low voltage winding of a 400/230 V, 1-phase, 50 Hz transformer is to be connected to a 25 Hz, the supply voltage should be 115 V.
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1
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asked
Mar 20, 2018
by
anonymous
The short circuit in any winding of the transformer is the result of?
Last answer:
The short circuit in any winding of the transformer is the result of impulse voltage.
short
circuit
winding
transformer
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133
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1
answer
asked
Mar 19, 2018
by
anonymous
Which type of winding is used in 3 phase shell-type transformer ?
Last answer:
Sandwich type winding is used in 3 phase shell-type transformer.
type
winding
used
phase
shell-type
transformer
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108
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1
answer
asked
Jan 8
by
anonymous
Compare core type transformer and shell type transformer on the following parameters. (i) Types of winding used, (ii) Application
Compare core type transformer and shell type transformer on the following parameters. (i) Types of winding used, (ii) Application
Last answer:
Ans:
dc
machines
transformers
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1
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asked
May 15, 2018
by
anonymous
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is? A.0.2 B.0.4 C.5 D.25
Last answer:
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is? A.0.2 B.0.4 C.5 D.25
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196
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1
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asked
May 15, 2018
by
anonymous
If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding,
If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 ohms? A.250 ohms B.25 ohms C.6,250 ohms D.62,500 ohms
Last answer:
6,250 ohms
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318
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2
answers
asked
May 8, 2018
by
anonymous
A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts
A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary? (A) 30 Volts (B) 480 Volts (C) 120 Volts (D) 60 Volts
Last answer:
A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary? (A) 30 Volts (B) 480 Volts (C) 120 Volts (D) 60 Volts
transformer
secondary
winding
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1
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asked
Mar 31, 2018
by
anonymous
For a 100% efficient transformer, the primary winding has 1000 turns ...
For a 100% efficient transformer, the primary winding has 1000 turns and the secondary 100 turns. If the power input to the above transformer is 1000 watts, the power output is_________.
Last answer:
For a 100% efficient transformer, the primary winding has 1000 turns and the secondary 100 turns. If the power input to the above transformer is 1000 watts, the power output is 1000 watts.
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103
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1
answer
asked
Mar 19, 2018
by
anonymous
In the transformer which winding has got more cross-sectional area?
Last answer:
In the transformer low voltage winding has got more cross-sectional area.
transformer
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134
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1
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asked
Mar 19, 2018
by
anonymous
Which winding of the transformer has less cross-sectional area ?
Last answer:
High voltage winding of the transformer has less cross-sectional area.
transformer
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57
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1
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asked
Sep 30, 2017
by
anonymous
does the high voltage side of Transformer winding have more number of turns?
Last answer:
yes High Voltage side of Transformer winding have more number of turns. and low voltage side of Transformer winding have less number of turns.
transformer
high
voltage
turns
winding
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83
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1
answer
asked
May 8, 2018
by
anonymous
An Auto-transformer (which has only one winding) may be used as a ______ .
An Auto-transformer (which has only one winding) may be used as a ______ . (A) Both Step-Up and Step-Down transformer (B) Step-Down Transformer (C) Step-Up Transformer (D) None of these
Last answer:
an autotransformer may used only as step down transformer
auto-transformer
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5.0k
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2
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asked
Apr 12, 2018
by
anonymous
In a fullwave rectifier circuit with centre tap transformer, if voltage between one end of secondary winding...
In a fullwave rectifier circuit with centre tap transformer, if voltage between one end of secondary winding and centre tap is 300V peak, then PIV (peak inverse voltage) is a. 300 V b. 150 V c. 600 V 5 d. 900 V
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asked
Apr 11, 2018
by
anonymous
If a 220/440 V, 50 Hz, 5 KVA, single-phase transformer operates on 220V, 40Hz supply with secondary winding...
If a 220/440 V, 50 Hz, 5 KVA, single-phase transformer operates on 220V, 40Hz supply with secondary winding open circuited: (A) both the eddy current and the hysteresis losses will decrease (B) both the eddy current and the hysteresis losses will increase (C) eddy current losses will remain the same but the hysteresis losses will increase (D) eddy current losses will increase but the hysteresis losses will remain the same
Last answer:
If a 220/440 V, 50 Hz, 5 KVA, single-phase transformer operates on 220V, 40Hz supply with secondary winding open circuited: both the eddy current and the hysteresis losses will decrease
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190
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1
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asked
Mar 19, 2018
by
anonymous
Primary winding of a transformer?
Last answer:
Primary winding of a transformer could either be a low voltage or high voltage winding.
transformer
primary
winding
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63
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1
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asked
Mar 19, 2018
by
anonymous
Which winding in a transformer has more number of turns ?
Last answer:
High voltage winding in a transformer has more number of turns.
transformer
turns
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1
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asked
Jan 13
by
anonymous
Ice glacier’s melting is a common phenomenon linked to the rise in seawater level. The glaciers are predominantly present in (1) Greenland (2) Antarctica (3) Himalayas (4) Arctic
Ice glacier’s melting is a common phenomenon linked to the rise in seawater level. The glaciers are predominantly present in (1) Greenland (2) Antarctica (3) Himalayas (4) Arctic
Last answer:
Antarctica
physical-geography
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20
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1
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asked
Sep 2, 2018
by
anonymous
A coil of 500 turns is linked with a flux of 25 mwb, when carries a current of 12.5A. Calculate the value of self-inductance.
A coil of 500 turns is linked with a flux of 25 mwb, when carries a current of 12.5A. Calculate the value of self-inductance.
Last answer:
Ans: Self-Inductance: L = NΦ /I = 500 × 25 × 10-3 / 12.5 = 1 H
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