Answer / raghavendran

power frequency withstand capability of a CB is its
capability to with any over voltage at system frequency for
a definite period of time say 1min.

Impulse frequency withstanding capability is to withstand
the impulsive voltage levels for a predefined period of
time.say 1.2(rise time)/50 microsec(fall time),100KV
say(impulse voltage level)

Answer / ibrahim

the root mean square (r.m.s.) value of sinusoidal power
frequency voltage that the cb can withstand during tests
made under specified conditions and for a specified time

What is mean by PID controller? And what is its Long form?

9 Answers   Jindal,

---

What is the armature mmf in a D.C machine?

0 Answers   HPCL,

---

Is it required to lay 2 runs of GI wires along with armoured cables from one power DB to another Power DB?

0 Answers  

---

What are the applications of different multistage amplifiers?Plz also write advantages of these amplifiers? Thaaaaaaaaanx

0 Answers  

---

when an induction motor runs on load.at that time if we reduce the supply voltage the current increases.But when it runs without load,if we reduce the supply voltage the current also reduced.why?.i checked it practically also.

1 Answers   Birla,

---

Generally in AC we consider voltage, frequency and phase sequence for parallel operation ... Can we parallel two DC battery chargers? If yes, then what precaution to be taken when we parallel two DC power?

5 Answers   Reliance,

---

How power is transferred from one winding to another in an auto-transformer? A) electrically B) magnetically C( both a & b D) neither of above

3 Answers   ISRO,

---

how to size a diesel generator set?

1 Answers  

---

what is the working principle of a DG Set, Alternator, & exiter

0 Answers  

---

Why we are mention U1, V1, and W1 in primary side of transformer give technical reason

1 Answers  

---

What is the Surge suppresor? Why using in a UDB's and How it works?

0 Answers  

---

How do you classify the different types of torques?

2 Answers  

---