Please Log in or Register for more.

What is the EMF equation of the transformer?

170 views

1 Answer

Answer :

E1 =2(3.142)fN1 (flux)1

E2 =2(3.142)fN2(flux)2

Like 0 like

Please log in or register to answer this question.

Related Questions








A parallel RLC circuit has the node equation Determine v(t) using the phasor method.
Last Answer : A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

Show More

142 views 1 answer







The loop equation for a series RLC circuit gives
Last Answer : The loop equation for a series RLC circuit gives

Show More

124 views 1 answer













State RADAR range equation and write factor influencing maximum range.
Last Answer : Free Space RADAR range Equation: 1.RADAR range equation relates the range of a RADAR to the chara. Of Tx, Rx, Antenna, target & environment. 2.Free space means RADAR and target are isolated in ... is no obstacle between RADAR antenna & the target. 4.There will be No absorption of EM waves.

Show More

2.4k views 1 answer







The equation of 50 Hz current sine wave having r.m.s. value of 60 A is?
Last Answer : (60*√2)Sin(2π*50*t)

Show More

1.1k views 2 answers







Explain dynamic and static induced emf with neat diagram.
Last Answer : Dynamically Induced EMF:-  In this case, either coil moves or magnet moves, so that there is relative motion between coil & magnetic field. Thus magnetic field is cut by coil & emf is induced in it. The emf ... The expression for induced EMF is e= -L(di/dt) or = -N(dϕ/dt).

Show More

593 views 1 answer







What is back emf? 
Last Answer : Back EMF: When a current carrying conductor is placed in a magnetic field it experiences a force; when it moves due to the force it (conductor) cuts the magnetic field due to which an emf is ... (hence the applied armature voltage) is opposed by the induced emf which is therefore called as Back emf.

Show More

91 views 1 answer







129 views 0 answers







Self induced emf and Mutually induced emf
Last Answer : (i) Self-induced e.m.f.: The e.m.f. induced in a coil due to the change of its own flux linked with it, is called self-induced e.m.f.  (ii) Mutually induced e.m.f.: The e.m.f. induced in a coil due to the changing current in the neighbouring coil, is called mutually induced e.m.f. 

Show More

140 views 1 answer







What is Phase sequence? Draw waveforms of 3 phase emf.
Last Answer : Phase sequence: It is the order in which the three phases reach their peak or maximum values. It is shown in below fig. the phase sequence is A-B-C (or R-Y-B). In the following waveforms, it is ... 120º, B- phase voltage attains its positive maximum value. So the phase sequence is R-Y-B. 

Show More

125 views 1 answer







Compare statically induced emf with dynamically induced emf on any four points.
Last Answer : Statically induced emf Dynamically induced emf Emf is induced without any relative motion between conductor and magnetic field. Emf is induced due to relative motion between conductor ... induced in transformer windings e.g emf induced in Generator, Alternator armature windings

Show More

1.1k views 2 answers







Explain the term self induced EMF with a neat diagram.

Show More

84 views 0 answers







Define: 1) statically induced EMF 2) dynamically induced EMF Write the names of equipments in which these two types of EMF get induced
Last Answer : Concept of statically induced emf: The emf induced in coil or conductors without any relative motion between it and magnetic field is called statically induced emf. When conductor is stationary and flux ... it. This emf is dynamically induced emf. e.g. Emf induced in generators, alternator.

Show More

882 views 3 answers







List the two types of induced EMF.
Last Answer : There are two types of EMF one is statically induced EMF and second is dynamically induced EMF.

Show More

117 views 1 answer







The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is  (1) 1000V (2) 100V (3) 600V (4) 10,000V
Last Answer : The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is 1000V

Show More

370 views 1 answer







The fractional-pitch used for eliminating 7th harmonic from the emf wave of an alternator is (A) 2/3 (B) 5/6 (C) 7/8 (D) 6/7
Last Answer : The fractional-pitch used for eliminating 7th harmonic from the emf wave of an alternator is 6/7

Show More

494 views 1 answer







The back emf of synchronous motor depends on?
Last Answer : The back emf of synchronous motor depends on load angle.

Show More

65 views 1 answer







Do AC induction motors have back EMF?

Show More

71 views 0 answers







What is back EMF of synchronous motor?

Show More

77 views 0 answers







What is back EMF in inductor?

Show More

138 views 0 answers







What is the back EMF in Transformers?

Show More

77 views 0 answers







What is the back EMF of a dc motor?

Show More

2.6k views 0 answers







What is the back EMF of the motor?

Show More

68 views 0 answers







What is the back EMF?
Last Answer : When the armature of a d.c. motor rotates under the influence of the driving torque, the armature conductors move through the magnetic field and hence e.m.f. is induced in them as in a generator. The ... that energy conversion in a d.c. motor is only possible due to the production of back emf.

Show More

107 views 1 answer







EMF equation of the transformer?
Last Answer : A. E = 4.44ΦmfN Volts. If E1 & E2 are primary and secondary emf’s and N1 & N2 are primary and secondary turns then, Voltage ratio= E1/E2 and Turns ratio of transformer = N1/N2 E1/E2 = N1/N2

Show More

7 views 1 answer







What is the EMF equation of transformer?
Last Answer : Erms = 4.44 f Φ maxT volt

Show More

7 views 1 answer







6 The value of flux involved in the emf equation of a transformer is A. rms value B. rms value C. Maximum value D. Instantaneous value
Last Answer : C) maximum value

Show More

40 views 1 answer













if need use https://www.mathway.com/Algebra.

Show More

2 views 0 answers







Draw the Delta connected three phase system showing all the voltages and currents. Write the power equation.

Show More

93 views 0 answers







28.In a two winding transformer, the emf /turn in secondary winding is always......the induced emf power turn in primary A. equal to k times B. equal to 1/k times C. equal D. greater than
Last Answer : C. equal

Show More

317 views 1 answer







6 In a two winding transformer, the primary and secondary induced emf E1 & E2 are always A. equal in magnitude B. anti phase with each other C. in phase with each other D. determined by load on transformer secondary
Last Answer : C. In phase with each other

Show More

434 views 1 answer







The counter e.m.f. of a d.c. motor?
Last Answer : The counter e.m.f. of a d.c. motor helps in energy conversion.

Show More

90 views 1 answer








Last Answer : E.m.f. of a Weston cell is accurately measured by electrostatic voltmeter.

Show More

205 views 1 answer








Last Answer : It is required to measure the true open circuit e.m.f. of a battery. The best device is D.C. potentiometer.

Show More

284 views 1 answer








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.

Show More

242 views 1 answer








Last Answer : When the armature of a D.C. motor rotates, e.m.f. induced is back e.m.f.

Show More

203 views 1 answer








Last Answer : The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

Show More

324 views 1 answer








Last Answer : In case of D.C. shunt motors the speed is dependent on back e.m.f. only because flux is practically constant in D:C. shunt motors.

Show More

250 views 1 answer








Last Answer : The armature may burn if the back e.m.f. of a D.C. motor vanishes suddenly.

Show More

423 views 1 answer








Last Answer : Power on primary and secondary side of transformer A. Remains Approximately constant B. Are always different C. Is always 100kVA D. None of these

Show More

686 views 2 answers







What is a Transformer ?
Last Answer : Ans : A transformer is a static piece of apparatus which transforms electrical energy from one Circuit to another circuit without changing the frequency either stepping up or stepping down the voltage .

Show More

4 views 1 answer







What are the transformer losses?
Last Answer : Answer: TRANSFORMER LOSSES - There are mainly two kinds of losses in a transformer namely 1. Copper loss (ohmic loss) and 2.magnetic loss (core loss). Copper losses are caused by the ... ohmic loss the following two losses are also present in the transformer stray load loss and dielectric loss.

Show More

4 views 1 answer







At what power maximum efficiency of power transformer and distribution transformer is designed
Last Answer : Maximum efficiency of the transformer is attained at certain load factor (α) when core losses of transformer is equal to the copper losses. PCore loss = α ^2 X PCopper loss From the ... the day. Hence distribution transformers are designed to have maximum efficiency at 50% of the rated full load

Show More

4 views 1 answer







What happen when Transformer is given DC supply ?
Last Answer : When DC supply is given to the transformer primary winding no back emf is induced in the transformer. Importance of Back emf is that it limits the current drawn by the machine. In the absence ... in burning down of primary winding. So when dc supply is given to transformer primary windings will burn

Show More

10 views 1 answer







During No load why the power factor of the transformer is very low ?
Last Answer : Current flowing through the transformer consists of two components. Magnetizing current (Im) which is in quadrature (90 0 ) to the applied voltage and in phase current which is in phase to the applied voltage ... power factor of transformer during no load condition will by in the order of 0.1 to 0.2

Show More

2 views 1 answer







What is the supply rated o/p if two single phase transformer connect to give three phase o/p from a three phase I/p?
Last Answer : A. Each transformer is only capable of supplying 86.6%of its o/p rating

Show More

5 views 1 answer







How to connect two single phase transformer to give three phase o/p from a three phase I/p ?
Last Answer : A. They would have to connect in an open-delta.

Show More

4 views 1 answer







What is the 3 ph transformer ?
Last Answer : A. A 3ph transformer is that transformer which is equivalent to three single phase transformer but wound on one core and enclosed within one common case.

Show More

4 views 1 answer






Show More⇦ PreviousNext ⇨