7/30/2019 Electrical and Electronics Engineering Interview
Common Questions
1/3
Q1:whats is MARX CIRCUIT?
# Marx ckt is An electric circuit used in an impulse generator
in which capacitors are charged in
parallel through charging resistors, and then connected in
series and discharged through the test
piece by the simultaneous sparkover of spark gaps.
Q2:Why link is provided in neutral of an ac circuit and fuse in
phase of ac circuit?
#purpose of fuse to protect the appliances from high current, if
we place fuse in neutral ,fuse will
melt after the current passed thro the applncs, hence eqpmnt
will b damaged instead if we place
the fuse in phase, the s.c current wil nt flow thro the eqpmnt
bcz fuse melts bfr the high current
passes thro the eqpmnt.
Q3: Define IDMT relay?
#IDMT - Inverse definite minimum relay. This kind of relays
tripping time decreases with
increasing fault current.
Q4:What is electric traction?
# electric traction means to move the body with electrical
machine.it is called electrical
traction,like electric trains nd their maners etc.
Q5:what is boucholz relay and the significance of it in to the
transformer?
# There are two types of faults incipient faults and major
faults inside a transformer, for both
faults we use bucholz relay.
Wen load on the transformer increases the temperature of the oil
increases if the oil is not gudone means if the dielectric strength
of the oil is not sufficient and if there z any moisture
content
in that oil, bubbles wil produce in the oil. If we leave further
the oil completely damages and
become conducting medium rather than insulation b/w primary and
secondary and transformer
wil burst. Hence we use bucholz relay to overcome the above
problem
If the bubbles r small in number it wil give alarm and if the
bubbles are high it wil trip the
transformer from the ckt.
Q6
Q7:what is power factor? whether it should be high or low?
why?
#Power factor is the ratio of real power and apparent power. It
denotes loss between power
generated and consumed. We should be maintain it at the value of
1.00 by maintaining the angle
between voltage and current zero.
Q8:Why is the starting current high in a DC motor?
7/30/2019 Electrical and Electronics Engineering Interview
Common Questions
3/3
# If The voltage rating of bulb equal to the phase to phase
voltage, then it glow. If voltage is
high, then bulb fuses. If low, then it will be dim
Q18:What is the one main difference between UPS & inverter
and electrical engineering &
electronics engineering?
# UPS has the ability to back up the load during power
interruption, it has rectifier, inverter and a
battery within itself, where as the inverter is jus converts
from DC to AC
UPS is protective device and storage power when power is
shutdown.The Inverter it convert DC
to AC
ups gives short time backup whereas inverter is used for long
time backup
ups provide continuous supply to connected appliences but
inverter convert the power and then
supply
Eletrical engineer deal with HV.Eletronic engineer deal with
small current(LV)
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