Discuss
menu
search
person
Login
Register
search
edit
Ask a Question
Discuss
All Activity
Q&A
Questions
Hot!
Unanswered
Tags
Ask a Question
The value of flux involved in the e.m.f. equation of a transformer is ?
Speak Question
asked
Mar 19, 2018
by
anonymous
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
130
views
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
1
Answer
Speak Answer
answered
Mar 19, 2018
by
anonymous
The value of flux involved in the e.m.f. equation of a transformer is
maximum value.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
Please
log in
or
register
to add a comment.
← Prev Question
Next Question →
Related questions
asked
Aug 27, 2019
by
anonymous
What is the back E.M.F in Transformer ?
What is the back E.M.F in Transformer ?
Last answer:
Back emf in transformer is when apply voltage in primary side of transformer. This voltage produce flux according to Faraday law electro magnetic induction. This flux called mutual flux and this ... secondary flux oppos the applied voltage according to lenz law. its called back emf of transformer
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
118
views
1
answer
asked
Apr 10, 2018
by
Narendra
E.M.F equation of a transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
67
views
0
answers
asked
Mar 19, 2018
by
anonymous
The path of magnetic flux in a transformer should have?
The path of magnetic flux in a transformer should have?
Last answer:
The path of magnetic flux in a transformer should have low reluctance.
magnetic
flux
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
275
views
1
answer
asked
Mar 19, 2018
by
anonymous
The leakage flux in a transformer depends upon?
Last answer:
The leakage flux in a transformer depends upon load current.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
105
views
1
answer
asked
Mar 19, 2018
by
anonymous
The use of higher flux density in the transformer design?
Last answer:
The use of higher flux density in the transformer design reduces weight per kVA.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
88
views
1
answer
asked
May 25, 2018
by
anonymous
The maximum flux in a transformer is φm when primary voltage is V and the frequency is f. If the primary
The maximum flux in a transformer is φm when primary voltage is V and the frequency is f. If the primary voltage is 2 V and frequency is f/2, the flux will be (a) 4 φm (b) 0.25 φm (c) φm (d) 0.5 φm
thumb_up_alt
0
like
thumb_down_alt
0
dislike
138
views
0
answers
asked
Aug 21, 2019
by
anonymous
(a) Define permeability. (b) Define MMF. (c) Define form factor of an alternating quantity. (d) Define frequency and time period of an alternating quality. (e) Define transformation ratio of transformer. (f) State the EMF equation of a 1 transformer and state the meaning of each term used. (g) Give two applications of single phase motors.
(a) Define permeability. (b) Define MMF. (c) Define form factor of an alternating quantity. (d) Define frequency and time period of an alternating quality. (e) Define transformation ratio of transformer. (f) State the EMF equation of a 1 transformer and state the meaning of each term used. (g) Give two applications of single phase motors.
Last answer:
Permeability : It is the ability of a magnetic/Non magnetic material to allow setting up of flux in it. MMF : The magneto motive force (MMF) is the force required to setup flux in a magnetic / ... applications of single phase motors : Water pumps, ceiling fan, lathe machine
permeability
mmf
thumb_up_alt
0
like
thumb_down_alt
0
dislike
108
views
1
answer
asked
Mar 20, 2018
by
anonymous
If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by?
Last answer:
If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by Blv.
flux
density
conductor
induced
emf
thumb_up_alt
0
like
thumb_down_alt
0
dislike
149
views
1
answer
asked
Apr 9, 2018
by
anonymous
The e.m.f. induced in the primary of a transformer: ...
The e.m.f. induced in the primary of a transformer: (A) is in phase with the flux (B) lags behind the flux by 90 degree (C) leads the flux by 90 degree (D) is in phase opposition to that of flux
Last answer:
The e.m.f. induced in the primary of a transformer: leads the flux by 90 degree
thumb_up_alt
0
like
thumb_down_alt
0
dislike
458
views
1
answer
asked
Dec 22, 2017
by
anonymous
What is the EMF equation of the transformer?
What is the EMF equation of the transformer?
Last answer:
E1 =2(3.142)fN1 (flux)1E2 =2(3.142)fN2(flux)2
emf
equation
transformer
thumb_up_alt
3
like
thumb_down_alt
0
dislike
127
views
1
answer
asked
Mar 19, 2018
by
anonymous
The purpose of providing an iron core in a transformer is to?
Last answer:
The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
84
views
1
answer
asked
Mar 19, 2018
by
anonymous
The purpose of providing iron core in a step-up transformer is?
Last answer:
The purpose of providing iron core in a step-up transformer is to decrease the magnitude of magnetizing current.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
291
views
1
answer
asked
Mar 19, 2018
by
anonymous
The thickness of laminations used in a transformer is usually?
Last answer:
The thickness of laminations used in a transformer is usually 0.4 mm to 0.5 mm.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
68
views
1
answer
asked
Mar 19, 2018
by
anonymous
The function of conservator in a transformer is?
Last answer:
conservator or a reservoir tank for insulating oil in transformer which used for balanced the onload oil level with help of oil level indicator which mount on middle part of reservoir tank.
transformer
conservator
thumb_up_alt
0
like
thumb_down_alt
0
dislike
105
views
3
answers
asked
Mar 19, 2018
by
anonymous
The function of breather in a transformer is?
Last answer:
The function of breather in a transformer is to arrest flow of moisture when outside air enters the transformer.
function
breather
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
111
views
1
answer
asked
Mar 19, 2018
by
anonymous
In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?
In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?
Last answer:
In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of less than 15A.
step-down
transformer
load
current
change
supply
thumb_up_alt
0
like
thumb_down_alt
0
dislike
92
views
1
answer
asked
Mar 19, 2018
by
anonymous
Greater the secondary leakage flux?
Last answer:
Greater the secondary leakage flux less will be the secondary induced e.m.f.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
118
views
1
answer
asked
Mar 19, 2018
by
anonymous
If a transformer is continuously operated the maximum temperature rise will occur in?
If a transformer is continuously operated the maximum temperature rise will occur in?
Last answer:
If a transformer is continuously operated the maximum temperature rise will occur in windings.
transformer
continuously
operated
maximum
temperature
thumb_up_alt
0
like
thumb_down_alt
0
dislike
56
views
1
answer
asked
Mar 19, 2018
by
anonymous
The hum in a transformer is mainly attributed to?
The hum in a transformer is mainly attributed to?
Last answer:
The hum in a transformer is mainly attributed to magnetostriction.
hum
transformer
mainly
attributed
thumb_up_alt
0
like
thumb_down_alt
0
dislike
86
views
1
answer
asked
Mar 19, 2018
by
anonymous
Noise level test in a transformer is a?
Last answer:
Noise level test in a transformer is a type test.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
71
views
1
answer
asked
Mar 19, 2018
by
anonymous
The no load current in a transformer lags behind the applied voltage by an angle of about?
Last answer:
The no load current in a transformer lags behind the applied voltage by an angle of about 75°.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
79
views
1
answer
asked
Mar 19, 2018
by
anonymous
The main reason for generation of harmonics in a transformer could be?
Last answer:
The main reason for generation of harmonics in a transformer could be saturation of core.
transformer
harmonics
thumb_up_alt
0
like
thumb_down_alt
0
dislike
71
views
1
answer
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
116
views
1
answer
asked
Mar 19, 2018
by
anonymous
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?
Last answer:
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.
transformer
voltage
losses
constant
load
changes
thumb_up_alt
0
like
thumb_down_alt
0
dislike
105
views
1
answer
asked
Mar 19, 2018
by
anonymous
In a transformer the tappings are generally provided on?
Last answer:
In a transformer, the tappings are generally provided on low voltage side.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
56
views
1
answer
asked
Mar 19, 2018
by
anonymous
In a transformer the resistance between its primary and secondary should be?
In a transformer the resistance between its primary and secondary should be?
Last answer:
In a transformer the resistance between its primary and secondary should be infinity.
transformer
resistance
between
primary
secondary
thumb_up_alt
0
like
thumb_down_alt
0
dislike
101
views
1
answer
asked
Mar 19, 2018
by
anonymous
No-load current in a transformer?
Last answer:
No-load current in a transformer lags behind the voltage by about 75°.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
61
views
1
answer
asked
Mar 19, 2018
by
anonymous
In a transformer routine efficiency depends upon?
Last answer:
In a transformer, routine efficiency depends upon load current and power factor of load.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
91
views
1
answer
asked
Mar 19, 2018
by
anonymous
In a power or distribution transformer about 10 percent end turns are heavily insulated?
Last answer:
In a power or distribution transformer about 10 percent end turns are heavily insulated to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns.
power
distribution
transformer
turns
heavily
insulated
thumb_up_alt
0
like
thumb_down_alt
0
dislike
71
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
108
views
1
answer
asked
Mar 19, 2018
by
anonymous
The core used in high frequency transformer is usually?
Last answer:
The core used in high frequency transformer is usually air core .
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
49
views
1
answer
asked
Jul 27, 2019
by
anonymous
State and justify which of the following two transformers is better: Transformer A = 4% voltage regulation Transformer B = 6% voltage regulation
State and justify which of the following two transformers is better: Transformer A = 4% voltage regulation Transformer B = 6% voltage regulation
Last answer:
Transformer A with 4% voltage regulation is better. Justification: Voltage regulation refers to the percentage change in secondary voltage when load is changed from no-load to full-load with primary voltage ... 4% voltage regulation, which is less as compared to 6% of transformer B, it is better.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
102
views
1
answer
asked
Mar 19, 2018
by
anonymous
Efficiency of a power transformer is of the order of?
Last answer:
The efficiency of a power transformer is of the order of 98 percent.
transformer
efficiency
thumb_up_alt
0
like
thumb_down_alt
0
dislike
60
views
1
answer
asked
Mar 19, 2018
by
anonymous
The maximum efficiency of a distribution transformer is?
Last answer:
The maximum efficiency of a distribution transformer is at 50% full load.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
58
views
1
answer
asked
Mar 19, 2018
by
anonymous
The magnetising current of a transformer is usually small because it has?
Last answer:
The magnetising current of a transformer is usually small because it has small air gap.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
61
views
1
answer
asked
Mar 19, 2018
by
anonymous
The full-load copper loss of a transformer is 1600 W At half-load, the copper loss will be?
Last answer:
The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be 400 W.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
69
views
1
answer
asked
Mar 19, 2018
by
anonymous
The secondary of a current transformer is always short-circuited under operating conditions because it?
The secondary of a current transformer is always short-circuited under operating conditions because it?
Last answer:
The secondary of a current transformer is always short-circuited under operating conditions because it avoids core saturation and high voltage induction.
secondary
current
transformer
short-circuited
operating
conditions
thumb_up_alt
0
like
thumb_down_alt
0
dislike
75
views
1
answer
asked
Mar 19, 2018
by
anonymous
The efficiency of a transformer, under heavy loads, is comparatively low because?
The efficiency of a transformer, under heavy loads, is comparatively low because?
Last answer:
The efficiency of a transformer, under heavy loads, is comparatively low because copper loss becomes high in proportion to the output.
efficiency
transformer
heavy
loads
comparatively
low
thumb_up_alt
0
like
thumb_down_alt
0
dislike
65
views
1
answer
asked
Mar 19, 2018
by
anonymous
The voltage transformation ratio of a transformer is equal to the ratio of?
The voltage transformation ratio of a transformer is equal to the ratio of?
Last answer:
The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.
voltage
transformation
ratio
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
100
views
1
answer
asked
Mar 19, 2018
by
anonymous
When secondary of a current transformer is open-circuited its iron core will be?
When secondary of a current transformer is open-circuited its iron core will be?
Last answer:
When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.
secondary
current
transformer
open-circuited
iron
core
thumb_up_alt
0
like
thumb_down_alt
0
dislike
101
views
1
answer
asked
Mar 19, 2018
by
anonymous
The chemical used in breather for transformer should have the quality of?
Last answer:
The chemical used in breather for transformer should have the quality of cleansing the transformer oil.
transformer
breather
thumb_up_alt
0
like
thumb_down_alt
0
dislike
96
views
1
answer
asked
Mar 19, 2018
by
anonymous
The transformer ratings are usually expressed in terms of?
Last answer:
The transformer ratings are usually expressed in terms of kVA.
transformer
rating
thumb_up_alt
0
like
thumb_down_alt
0
dislike
214
views
1
answer
asked
Mar 19, 2018
by
anonymous
The power transformer is a constant?
Last answer:
The power transformer is a constant main flux device.
transformer
power
thumb_up_alt
0
like
thumb_down_alt
0
dislike
43
views
1
answer
asked
Mar 19, 2018
by
anonymous
The noise produced by a transformer is termed as?
The noise produced by a transformer is termed as?
Last answer:
The noise produced by a transformer is termed as hum.
noise
produced
transformer
termed
thumb_up_alt
0
like
thumb_down_alt
0
dislike
77
views
1
answer
asked
Mar 19, 2018
by
anonymous
The maximum load that a power transformer can carry is limited by its?
The maximum load that a power transformer can carry is limited by its?
Last answer:
The maximum load that a power transformer can carry is limited by its voltage ratio.
maximum
load
power
transformer
carry
limited
thumb_up_alt
0
like
thumb_down_alt
0
dislike
104
views
1
answer
asked
Mar 19, 2018
by
anonymous
If a transformer is switched on to a voltage more than the rated voltage?
If a transformer is switched on to a voltage more than the rated voltage?
Last answer:
If a transformer is switched on to a voltage more than the rated voltage its power factor will deteriorate.
transformer
switched
voltage
rated
thumb_up_alt
0
like
thumb_down_alt
0
dislike
70
views
1
answer
asked
Mar 19, 2018
by
anonymous
When a given transformer is run at its rated voltage but reduced frequency, its?
Last answer:
When a given transformer is run at its rated voltage but reduced frequency, its core flux density is increased.
transformer
thumb_up_alt
0
like
thumb_down_alt
0
dislike
78
views
1
answer
asked
Mar 19, 2018
by
anonymous
An open-circuit test on a transformer is conducted primarily to measure?
An open-circuit test on a transformer is conducted primarily to measure?
Last answer:
The open-circuit test in a transformer is used to measure
open-circuit
test
transformer
conducted
primarily
measure
thumb_up_alt
0
like
thumb_down_alt
0
dislike
284
views
2
answers
asked
Mar 19, 2018
by
anonymous
A no-load test is performed on a transformer to determine?
A no-load test is performed on a transformer to determine?
Last answer:
A no-load test is performed on a transformer to determine magnetizing current and loss.
no-load
test
transformer
determine
thumb_up_alt
0
like
thumb_down_alt
0
dislike
86
views
1
answer
asked
Mar 19, 2018
by
anonymous
A ferro resonant transformer regulation is also known as?
A ferro resonant transformer regulation is also known as?
Last answer:
A ferro resonant transformer regulation is also known as constant current transformer.
ferro
resonant
transformer
regulation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
71
views
1
answer
...