Interview Questions Answers in Electrical Engineering

Differance between ELCB and RCCB?

Answer

ELCB- earth leakage circuit breaker which will trips only
on earth fault or earthy leakage.

RCCB- Residual Current Circuit Breaker which will trips in
earth leakage as well as over current fault.

Is This Answer Correct ?

13 Yes

5 No

Question { 94178 }

howmuch current can carry the 2.5Sqmm copper cable?

Answer

Max 10 amps as per standard.

Is This Answer Correct ?

13 Yes

13 No

Question { Wipro, 5815 }

what is the difference between LATCH and FLIP FLOP

Answer

basically both logic is same.

flip flop has tow out puts Q and inverse Q.its doesn't
change out put untill its get in put for set or reset.

latch:when input is high the out put of the latch is
active.when ihput is zero its out does'nt change. it wil
change the out put only when the scond time input is high.

Is This Answer Correct ?

1 Yes

0 No

Question { 36313 }

What are the advantages of DOL starter?

Answer

1.The place occupy is less.
2.can be used for high torque motors. like cruchers.blowers.
3.trouble shooting is very simple.
4.cost.

Is This Answer Correct ?

62 Yes

10 No

Question { 5021 }

Give two basic sprrd control scheme of DC shunt motor.

Answer

can be controlled through triac. we have done our project.
speed control of DC shunt motor using triac.

Is This Answer Correct ?

2 Yes

1 No

Question { 8072 }

what is buscoupler adopter panel????

Answer

If the panel having morethan 1 mains ... one breaker will
be used between 2 mains which can be used to supply the
power if case of any mains failuire its called buscoupler.

Is This Answer Correct ?

1 Yes

1 No

Question { 43268 }

Why Current Transformers cannot be connected in parallel

Answer

who told this???

for relay and energy meters , CT's are connecting in
parellel only.

Is This Answer Correct ?

9 Yes

22 No

Question { NFCL, 27569 }

what is buchholz relay?what is it used for?

Answer

its a relay used for transformer protection.the of
buchholz relay locateed in oil tank bet ween main tank and
conservator tank. due to transformer winding heat.. bubbles
will be formed. those bobbles wil act the relay...first
signal from relay is alaram..and scound will trip the
circuit.

Is This Answer Correct ?

45 Yes

10 No

Question { 17400 }

why we cant use AC supply products in DC supply?

Answer

y not. use through inverter.

Is This Answer Correct ?

6 Yes

6 No

Question { 17400 }

why we cant use AC supply products in DC supply?

Answer

mm....some of ac product we can use in dc also.

like bulb and heater.

Is This Answer Correct ?

1 Yes

7 No

Question { 17400 }

why we cant use AC supply products in DC supply?

Answer

well friend. both of them resistive load. if u have doubt
just check in prctically.

Is This Answer Correct ?

4 Yes

4 No

Question { 17400 }

why we cant use AC supply products in DC supply?

Answer

yes. the max. rating of the bulb is 230 v. its not meaning
that it wont work in 100v or 150v something. but the
illumination would be depends on the rating of the input
voltage.

Is This Answer Correct ?

0 Yes

3 No

Question { 17400 }

why we cant use AC supply products in DC supply?

Answer

we are talking abt DC supply only.we no need to worry abt
wherer ists from.

Is This Answer Correct ?

0 Yes

4 No

Question { Bombardier, 11521 }

what is anode and cathode??

Answer

its the two ends of diode.

Is This Answer Correct ?

13 Yes

6 No

Question { HAL, 4255 }

which connection is there in a rotor of the motor

Answer

its star conneced conductors in rotor of the motor.

Is This Answer Correct ?

4 Yes

0 No

sennapparajan