Electrician Exam – Important Questions

1.Which of the following is the starter used for 3 phase slip ring induction motor?

Rotor resistance

2. The conductor used for over head transmission line is….?

ACSR

3. The current transformer  is used to measure….?

high current

4. 1 Joule =….?

1Ws

5. Smoothening is the fire extinguishing process by which method?

Isolate the fire from the supply of oxygen

6. The dielectric strength of air under normal conditions in KV/cm is about….?

30

7. The direction of induced emf can be determined by….?

flemming’s rightt hand rule

8. The negative plate of lead acid cell is….?

lead

9. The IS Code of earthing is…?

IS 3043

10. In an electric heater the heating coil is generally made by…?

Nichrome

11. For magnetic shielding which material is used?

Iron

12. For a fine hack saw blade the pitch is…?

0.8 mm

13. BT- 136 is a semi conductor device, the device is…?

Triac

14. What is the maximum pre-heating temperature allowed in winding?

90 degree celsious

15. In breather de-hydrating material is…?

Calcium chloride

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