Answer Posted / jahanzeb

isolators are operated at off load condition ... firstly
circuit breaker breaks the circuit .....

if isolated is operated at on load then flash or sparking
takes place due heavy voltages which shows hazardous effects...

so is use to minimize the sparking effect.... we can say
thay it is a slow switch and cb is the fast one ;-)

if any one who attended the caterpillar interview please send me the sample questions and the areas from which questions are being asked...

2409

---

How the bearing numbers are allocated?

2122

---

Explain enthalpy.

1075

---

How fast is a jet plane?

1045

---

In some engines glycerine is used in place of water for cooling of engine. Why ?

1362

---

what are the main challenges with solar energy system?

2209

---

What are some mechanical laboratory apparatuses?

1147

---

what is the significance of line of action in gear?

2101

---

What is allotrope ? In what forms of cubic pattern, iron exists ?

1159

---

Name two types of leak detectors and the method of application for each?

3434

---

What are the automatic tripping devices of diesel generator?

1890

---

Define earth lamp?

2332

---

What is a feed water pump? Dearator feed heater?

2139

---

hi, if anyone have previous year paper of NHPC or some questions, Please send me at gupta.pankaj20@gmail.com

2831

---

What are the different types of springs and explain them?

1072

---