List the different devices and components of main switchboard.

2459

---

How do you detect earth by lam p?

1875

---

How do you reset the circuit breaker?

1969

---

What is the purpose of ventilation in the battery room?

1984

---

What are the usual checks when induction motor is running?

2068

---

Methods to dry up wet induction motors?

2034

---

The lowest allowable insulation resistance?

1919

---

What is space heater?

1848

---

What is hertz in electrical system?

2021

---

Draw a parallel circuit with one battery and two resistors. Derive the formula for resistance?

1894

---

Define earth lamp?

2025

---

What is the use of multi tester?

1914

---

"How to check the diode, fuse and bearer switch?"

2154

---

What is the formula to determine the speed of induction motor?

1919

---

Name the four most important components of a Freon refrigeration system.

1962

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