Answer / shakti

4 ma

Answer / sparkindia

when telephone is in on hook condition (in idle
condition):voltage:-48v(minus voltage is used only for
protection purpose)

current: less than 5 micro Amp (idle
0 amp)
when telephone is in off hook condition (in use condition):
voltage:Between- 9V to- 3V

current: 20 mA to 30 mA

Resistance of telephone circuit (like our bsnl telephone)
is 200ohms.But it can vary as per manufacturer.
When telephone is ringing:Ringer voltage:90V AC

90V AC Ringer voltage is superimposed on 48V DC.

above data is calculated for telephone lines having
distance of almost 4.5 km between home and telephone
exchange which is generally used.

Answer / noddy

4miliampere

Answer / ramesh

I think 12V DC

i cleared the written xam. for the post of atc now what i am going to prepare for the interview plz.guide me i dnt wanna loose this organisation bcoz its my dream company

0 Answers   AAI Airports Authority Of India,

---

What is the diffenece b/w QPSK and DPSK?In these which one is better and why its better?

4 Answers   Infosys, Innovis, TATA,

---

Can anyone Explain about TRIAC ,SCR ,JFET , UJT in simpler words...

3 Answers  

---

what is used in cd audio player to reproduce sound?

2 Answers  

---

draw the circuit diagram of a transistor frequency convertor using a tetrode transistor?

0 Answers  

---

What are the faults that might happen in SCADA ?

0 Answers   Havells,

---

wat area the advantages of network gateway

1 Answers  

---

why the cut in voltage of the LED is higher then diode? WHAt is the reason of not using the LED in the rectifier circuit

2 Answers  

---

Explain the approximate cost of the smart pebbles eci-1(embedded corrosion instrument)?

0 Answers  

---

What is the difference between active power and reactive power....?

2 Answers  

---

Where lcr meter is used?

0 Answers  

---

plz send the rrb junior engg and assistant loco pilot previous quastion papers

0 Answers  

---