19) The only wiring which has to be planned well before starting of a house construction work and executed along with construction is :

Answer is:

conduit concealed wiring

Wiring MCQ - Electrician (Set-1) with Answers

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Related Wiring MCQ - Electrician (Set-1) with Answers

20) Corridor lighting for three lamps can be operated by :

all lamps in 'ON' and 'OFF' position by two-way switches and two intermediate switches.

independent light in 'ON' and 'OFF' position by two intermediate switches.

all lights in 'ON' and 'OFF' position by two intermediate switches.

both 1) all lamps in 'ON' and 'OFF' position by two-way switches and two intermediate switches. and 2) independent light in 'ON' and 'OFF' position by two intermediate switches.

Answer is:

both 1) all lamps in 'ON' and 'OFF' position by two-way switches and two intermediate switches. and 2) independent light in 'ON' and 'OFF' position by two intermediate switches.

21) According to NE code, the colour code for the neutral is :

Answer is:

black

22) To estimate the materials and cables, the diagram which is very useful will be :

Answer is:

laying diagram and wiring diagram

23) This diagram is not possible to be drawn for the entire wiring installation. But it is drawn to get the approval of the customer to have overview.

Answer is:

Installation plan

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