List the different devices and components of main switchboard.

2511

---

How do you detect earth by lam p?

1927

---

How do you reset the circuit breaker?

2039

---

What is the purpose of ventilation in the battery room?

2054

---

What are the usual checks when induction motor is running?

2129

---

Methods to dry up wet induction motors?

2098

---

The lowest allowable insulation resistance?

1982

---

What is space heater?

1896

---

What is hertz in electrical system?

2084

---

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

1950

---

Define earth lamp?

2105

---

What is the use of multi tester?

1964

---

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

2271

---

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

1979

---

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

2009

---