Interested to Buy Any Domain ? << Click Here >> for more details...
Where -48 volt DC use & why?????????
- 10 Answers
- 31998 Views
- Ericsson, INDUS, Indus Towers, Telecom, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / pundlik wanwe
48v Dc is used in the telecommunication circuit.
| Is This Answer Correct ? | 57 Yes | 6 No |
Answer / rabi
A negative line voltage helps to reduce the corrosion from
electrochemical reactions occurring on a wet telephone line.
Also -48v DC is more stable than +48 volit, so -48 V is
preferred.
| Is This Answer Correct ? | 41 Yes | 5 No |
Answer / subra
in -48v dc system positive + is earthed. Negative- is
giving to the equipment.Normally in automobile dc system
negative is earthed.positive is giving to equipment.in
positive grounding system we can avoid corrossion on
terminals.
| Is This Answer Correct ? | 15 Yes | 3 No |
Answer / anant gupta
it's true that telecommunications equipments operates on the
negative 48 volts DC.
how can we get any voltage while we are grounding the
positive terminal. pls give details.....
| Is This Answer Correct ? | 9 Yes | 4 No |
Answer / shri..
Thanks for repply
But why not using + ve 48 volt????
| Is This Answer Correct ? | 10 Yes | 8 No |
Answer / muralichppl
what is difference between + 48V and - 48V and how can we we
get individually
| Is This Answer Correct ? | 8 Yes | 7 No |
Answer / avinash
Even if a high supply current comes,the equipment can
compensate due to -ve voltage
| Is This Answer Correct ? | 6 Yes | 5 No |
Answer / maxiquiet
why do we prefer -48 volt instead of -24volt or -12 volt
etc. ??
| Is This Answer Correct ? | 5 Yes | 4 No |
Answer / jitender kotwal
first understand what -48 volt means,it means that when we
grounded the nagtive termnal of supply making it to zero
potential means nagative supply, in communacations we use
negative voltage to reduce the noise and hum level.
| Is This Answer Correct ? | 4 Yes | 5 No |
Answer / hemant
WHEN CLOUDS STRIKE THEY PRODUCE -VE CHARGE ,& FOR DISCHARGE THEY NEED THE ZERO POTENTIAL AT EARTH.IN TELECOM WE R GROUNDING THE -VE TERMINAL OF SUPPLY TO MAKE IT ZERO POTENTIAL .IF WE GROUND THE +VE TERMINAL THEN ALL THE EQUIPMENT WILL DAMAGE OR FIRED BECAUSE CLOUD WILL CHOOSE LOW RESISTANCE
+VE CHARGED ANTENAS.THAT IS THE REASON WE USE -48V.
| Is This Answer Correct ? | 6 Yes | 14 No |
If induction motor load is incresed motor speed decrases.But in syncronous motor load incrases speed canstant why?
what are the difference between PLC and embedded
Wat is the best to use in a generator a 6.5kva or a 7 kw
what is the max load on a 10 mva transformer & plz define it with its formula
The rotor current is directly proportional to slip. How?
Dear All kindly let me know that I know about the DG Rating for Example 150 KVA,Now how i will know that how much Ampher load it can offoard.
what is the reqirred voltage in HT motor to get full RPM on no load test?
any one guide me to reduce the power factor of diesel Generator from 0.97 Leg to 0.8 Leg.with out any change in my load.
Send me Model Question paper for the post Scientific Assistant in NPCIL
Difference between on line capacitor and Station type capacitor
why can't we increase the voltage by increasing the field voltage in order to get higher voltage.so that we can eliminate step up transformer
Which motor connection is preferable star-delta or delta-star?
-
Civil Engineering (5086) - Mechanical Engineering (4456)
- Electrical Engineering (16639)
- Electronics Communications (3918)
- Chemical Engineering (1095)
- Aeronautical Engineering (239)
- Bio Engineering (96)
- Metallurgy (361)
- Industrial Engineering (259)
- Instrumentation (3014)
- Automobile Engineering (332)
- Mechatronics Engineering (97)
- Marine Engineering (124)
- Power Plant Engineering (172)
- Textile Engineering (575)
- Production Engineering (25)
- Satellite Systems Engineering (106)
- Engineering AllOther (1379)
