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a magnetic circuit of csa 045 cm 2 consists of one part 4 cm long and mur of 1200 and a second part 3 cm long and mur
a circular toroid of mean diameter 25 cm and csa 4 cm 2 has a 15 mm air gap in it the toroid is wound with a 1200 turn
a magnetic circuit made of radiometal is subjected to a magnetic field strength of 5000 atm using the data given in fig
a cast steel toroid has the following b h data complete the data table for the corresponding values of mur and hence
a toroid of mean radius 35 mm effective csa 4 cm2 and relative permeability 200 is wound with a 1000 turn coil that
1 an air-cored coil contains a flux density of 25 mt when an iron core is inserted the flux density is increased to 16
1 calculate the current required in a 500 turn coil to produce an electric field strength of 4000 atm in an iron
1 a 41 voltage lsquo step-down transformer is connected to a 110 v ac supply if the current drawn from this supply is
1 sketch the circuit symbol for a transformer and explain its principle of operation why is the core made from
the mutual inductance between the two windings of a car ignition coil is 5 h calculate the average emf induced in the
two coils of self-inductance 50 mh and 85 mh respectively are placed parallel to each other if the coupling coefficient
two air-cored coils a and b are wound with 100 and 500 turns respectively a current of 5 a in a produces a flux of 15
a coil of 5000 turns is wound on to a nonmagnetic toroid of csa 100 cm2 and mean circumference 05 m a second coil of
1 when the current in a coil changes from 2 a to 12 a in a time of 150 ms the emf induced into an adjacent coil is 8 v
an iron ring of mean length 50 cm and csa 08 cm2 is wound with a coil of 350 turns a current of 05 a through the coil
1 calculate the self-inductance of a 700 turn coil if a current of 5 a fl owing through it produces a flux of 8 mwb2 a
1 explain what is meant by the term lsquo loading effect 2 a voltmeter having a figure of merit of 15 k omega volt has
for the meter movement described in question 19 above show how it may be adapted to serve as a voltmeter with voltage
1 the magnetic flux density at a distance of 14 m from the centre of a current carrying conductor is 025 mt determine
two long parallel conductors are spaced 12 cm between centres if they carry 100 a and 75 a respectively calculate the
a moving coil meter has a coil of 60 turns wound on to a former of effective length 225 mm and diameter 15 mm if the
the coil of a moving coil meter is wound with 75 turns on a former of effective length 25 cm and diameter 2 cm the
a shunt generator supplies a current of 85 a at a terminal pd of 380 v calculate the generated emf if the armature and
the waveform displayed on an oscilloscope is as shown in fig 640 the timebase is set to 100 muscm and the y-amp is set
for each of the following alternating quantities determinea the amplitude and rms value andb the frequency and periodi