Electrical engineering interviewtop 8 questions Answer 2021 |
1. How many types of cooling system in transformers on an oil natural a natural?
Ans :1f oil natural air first off F oil forced air forced odwF oil direct water forced o fan oil forced air forced their are a transformer and induction machine. those two have a same supply for which device the load current will be maximum and why the motor has max load current compared to that of transformer because the motor consumes real power and the transformer is only producing the working flux and it's not consuming hence the load current in the transformer is because of core loss so it is minimum.
what is to phase motor a
two phase motor is a motor with the
starting winding and the running winding
have a phase split example AC servo
motor where the auxiliary winding and
the control winding have a faceplate of
ninety degree what will happen when
power factor is leading in distribution
of power if there is high power factor
that is if the power factor is close to
one losses in form of heat will be
reduced cable becomes less bulky and
easy to carry and very cheap to effort
and it also reduces overheating of
transformers what is AC SR cable and
where we use it AC SR means LVM
conductors steel-reinforced this
conductor is used in transmission and
distribution which motor has high
starting torque and starting current DC
motor induction motor or synchronous
mode
DC series motor has high starting torque
we cannot start the induction motor and
synchronous motor on load but cannot
start the DC series motor without load
what happened if we you to 20 volts DC
supply to the bulb Antibes light bulbs
for AC are designed to operate such that
it offers high impedance to AC supply
normally they have low resistance when
DC supply is applied due to low
resistance the current through lamp
would be so high that it may damage the
bulb element what is meant by armature
reaction the effect of armature flux to
main flux is called armature reaction
the amateur flux may support main flux
or opposes main flux what is the
principle of motor
whenever a current carrying conductor is
placed in a magnetic field
it produces turning or twisting moment
is called as torque what are the
advantages of speed control using 3
stirrer advantages fast switching
characteristics than MOSFET BJT IGBT low
cost higher accurate what is encoder and
how it functions an encoder is a device
used to change a signal such as a bit
stream or data into a code the code miss
of any of a number of purposes such as
compressing information for transmission
or storage encrypting or adding
redundancies to the input code or
translating from one code to another
code this is usually done by means of a
programmed algorithm specially if any
part is digital while most analog
encoding is done with analog circuitry
what is Marc circuit it is used with
generators for charging a number of
capacitors in parallel and discharging
them in a series it is used when voltage
required for
sting is higher than the available those
operation carried out in thermal power
stations the water is obtained in the
boiler and the core is burned so that
steam is obtained this steam is allowed
to hit the turbine the turbine which is
coupled with a generator generates the
electricity how can you start up the 40
watt tube light with 230 volts of ac/dc
without using any choke or coil it's
possible by means of electronic chokes
otherwise it is not possible to ionize
the particles in the tube light without
normal voltage what is electric
attraction electric traction means using
the electric power for traction system
that is for railways trams trolleys etc
electric traction means use of the
electricity for railways trams trolleys
etc nowadays magnetic traction is also
used for bullet trains and basically DC
motors are used for electric traction
systems
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