Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them
two in parallel and third in series with this combination
two in series and third in parallel across this combination
all in parallel
all in series
two in parallel and third in series with this combination
An air gap is usually inserted in magnetic circuits to
prevent saturation
increase the flux
increase m.m.f.
none of the above
prevent saturation
The relative permeability of a ferromagnetic material is
more than 10
more than 100 or 1000
less than one
more than one
more than 100 or 1000
The unit of magnetic flux is
weber
henry
ampereturn/weber
ampere/metre
weber
Permeability in a magnetic circuit corresponds to______ in an electric circuit.
conductance
resistivity
resistance
conductivity
conductivity
Reciprocal of permeability is
susceptibility
permittivity
reluctivity
conductance
reluctivity
The relative permeability is less than unity is case of
diamagnetic materials
non-ferrous materials
ferrites
ferromagnetic materials
diamagnetic materials
Which of the following is the unit of magnetic flux density ?
tesla
lumens
weber
none of the above
tesla
The magnetism left in the iron after exciting field has been removed is known as
reluctance
residual magnetism
permeance
susceptance
residual magnetism
Which of the following is not a unit of flux?
Telsa
Maxwell
Weber
All of the above
Telsa
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