Answer / sudipto jena

hello,this is sudipto,from rourkela
In the above question ,there is a alphabet and then two
digits are present in the code.The digits are for current
carrying capacity. Here the mcb can carry 32 A of ac current
safely.
Now the alphabet stands for the type of mcb, taking
overloading and tripping time of mcb in account.
A for 1.5 to 2 times of overload current and tripping time
about 70 ms
B for 3 to 5 times of overload current and tripping time
about 50-60 ms
C for 5 to 10 times of overload current and tripping time
about 35-45 ms
D for 10 to 15 times of overload current and tripping time
about 20 ms
Generally for residential wiring we use D type for the
purpose of protecting from short ckt fault.

Answer / manikandan krishnan

First Digit A denotes tripping Curve and second two digits are rating of the breaker..Normally C curve withstand 7-10 time of FLC,D - 10-14 TIMES AND B CURVE is 3.2-4.8 TIMES OF FLC.

GIVE CONDITION FOR MAX EFFICIENCY OF 3-PH TRANSFORMER AND D.C MOTOR

2 Answers   BARC,

---

tell 2 reasons for why only copper is used in domestic wires& only alluminium in transmission lines ?

10 Answers   ABB,

---

Is an SCR semi controlled device?

4 Answers   IOCL,

---

How the PF control while running DG set with load

0 Answers  

---

in short circuit. test of a transformer 5 to 10% ofvrated voltage is used why??? if we use rated voltafe then what will be?

1 Answers  

---

transmisssion type

0 Answers  

---

why the capacity of power plant is given in MW though the generators are rated in MVA?

3 Answers   TATA,

---

wath is this mining of dg

2 Answers   Nokia,

---

what is use of reactive power in ac ckt.

2 Answers  

---

In APFC panel, Why on dealy timer is used in Capacitor controlling circuit?

1 Answers  

---

If DC supply is given to a transformer it may a) Work b)Not Work c)Give lower voltage than the rated voltage on secondary side. d)burn the winding

12 Answers   wbsedcl,

---

In Dyn11 power transformer if any one of the 3 phases connected to earth in star connected side then please explain effect of the current flow in delta connected side of transformer.(In this case if one phase is shorted to ground in star connected side then we observe the current flow in two phases only not three phases in delta connected primary side. Please explain why it is so?)

0 Answers  

---