BASIC WIRING PRACTICE - Quiz

1) Which electrical equipment is provided with L series MCB?

General lighting Motors Air conditioner Halogen lamp

2) Why the looping-back (loop in) method is preferred in domestic wiring installation?

Easy to identify the faults No separate joints are used More number of tappings can be taken More number of sub-circuits can be made

3) Calculate the earth fault loop impedance, if the ELCB tripping current is 30 mA?

166 Ohm 1666 Ohm 16.66 Ohm 16666 Ohm

4) What is length of thread on rigid conduits as per BIS?

9mm - 20mm 11mm - 27mm 13mm - 25mm 15mm - 30mm

5) Which type of conduit used for gas tight explosive installation?

Flexible conduits Rigid steel conduits Rigid non-metallic conduits Flexible non-metallic conduits